Journal Paper

• Davide Cavaliere, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Reduced artifacts in dynamic electrochemical impedance spectroscopy applied to battery degradation analysis, Journal of Power Sourcs, Elsevier, Vol. 621, pp. 235316, Nov. 2024.  Official location  
• Kotaro Yoshida, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. An all-solid-state electrochemical four-electrode cell–Application to Li-ion transport between two sulfide solid electrolytes, Electrochimica Acta, Elsevier, Vol. 497, pp. 144523, May 2024.  Official location  
• Davide Cavaliere, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Diagnosis of Li-ion battery degradation based on resistive and diffusion-related transient voltage changes at early stage of discharge, Journal of Power Sources, Elsevier, Vol. 603, pp. 234441, Apr. 2024.  Official location  
• Chihiro Yamamoto, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes, Electrochemistry, Vol. 92, Issue 2, Page 027001, Feb. 2024.  Official location  
• Kota Nakahara, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Enhanced Oxygen Reduction Activity of Platinum Micropore, ChemElectroChem, Chemistry Europe, Vol. 11, No. 11, Page e202300654, Jan. 2024.  Official location  
• Goro Fukunishi, Atsunori Ikezawa, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno, Hajime Arai. Impedance analysis and cyclability evaluation of graphite composite electrodes with all-solid-state three-electrode cells, ACS Applied Energy Materials, American Chemical Society, Vol. 6, Issue 21, pp. 10908-10917, Oct. 2023.  Official location  
• Goro Fukunishi, Mayu Tabuchi, Atsunori Ikezawa, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno, Hajime Arai. AC impedance analysis of NCM523 composite electrodes in all-solid-state three electrode cells and their degradation behavior, Journal of Power Sources, Vol. 564, No. 30, pp. 232864, Mar. 2023.  Official location  
• Atsunori Ikezawa, Goro Fukunishi, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kota Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. Performance of Li4Ti5O12-based Reference Electrode for the Electrochemical Analysis of All-solid-state Lithium-ion Batteries, Electrochemistry Communications, Vol. 116, 106743, Mar. 2020.  Official location  
• Wu, Y., TAKEYOSHI OKAJIMA, Ohsaka, T.. Lithium intercalation into graphene ribbons of glassy carbon, International Journal of Electrochemical Science, Vol. 12, No. 2, pp. 1004-1013, 2017.
• Ferdousi, B.N., Islam, M.M., TAKEYOSHI OKAJIMA, Ohsaka, T.. Exploring pKa of peroxycitric acid coexisting with citric acid in aqueous solution with voltmmetric, potentiometic and chromatographic approaches, International Journal of Electrochemical Science, Vol. 11, No. 7, pp. 6215-6228, 2016.
• Ismail, I., TAKEYOSHI OKAJIMA, Susumu Kawauchi, Ohsaka, T.. Studies on the early oxidation process of dopamine by electrochemical measurements and quantum chemical calculations, Electrochimica Acta, Vol. 211, pp. 777-786, 2016.
• Ye, X., TAKEYOSHI OKAJIMA, Ohsaka, T.. Probable problems in the analysis of chemical oxygen demand of wastewaters treated by advanced oxidation process: residual H2O2 and acidity of the treated waters, Desalination and Water Treatment, Vol. 57, No. 56, pp. 27138-27143, 2016.
• Manabe, A., Domon, H., Kosaka, J., Hashimoto, T., TAKEYOSHI OKAJIMA, Ohsaka, T.. Study on separator for alkaline water electrolysis, Journal of the Electrochemical Society, Vol. 163, No. 11, pp. F3139-F3145, 2016.
• Miah, M.R., TAKEYOSHI OKAJIMA, Ohsaka, T.. Oxygen reduction reaction at in situ fabricated active gold over layers in acidic media, International Journal of Electrochemical Science, Vol. 11, No. 9, pp. 7909-7921, 2016.
• Raj, C.R., Samanta, A., Noh, S.H., Mondal, S., TAKEYOSHI OKAJIMA, Ohsaka, T.. Emerging new generation electrocatalysts for the oxygen reduction reaction, Journal of Materials Chemistry A, Vol. 4, No. 29, pp. 11156-11178, 2016.
• Noh, S.H., Seo, M.H., Kang, J., TAKEYOSHI OKAJIMA, Han, B., Ohsaka, T.. Towards a comprehensive understanding of FeCo coated with N-doped carbon as a stable bi-functional catalyst in acidic media, NPG Asia Materials, Vol. 8, No. 9, 2016.
• Jiajia Wu, Da Zhang, Hideharu Niwa, Yoshihisa Harada, Masaharu Oshima, Hironori Ofuchi, Yuta Nabae, Takeyoshi Okajima, Takeo Ohsaka. Enhancement in Kinetics of the Oxygen Reduction Reaction on a Nitrogen-Doped Carbon Catalyst by Introduction of Iron via Electrochemical Methods, Langmuir, American Chemical Society, Vol. 31, No. 19, pp. 5529-5536, Apr. 2015.  Official location  
• Azhagumuthu Muthukrishnan, Yuta Nabae, Takeyoshi Okajima, Takeo Ohsaka. Kinetic Approach to Investigate the Mechanistic Pathways of Oxygen Reduction Reaction on Fe-Containing N-Doped Carbon Catalysts, ACS Catalysis, American Chemical Society, pp. 5194-5202, 2015.  Official location  
• Azhagumuthu Muthukrishnan, Yuta Nabae, Teruaki Hayakawa, Takeyoshi Okajima, Takeo Ohsaka. Fe-containing polyimide-based high-performance ORR catalysts in acidic medium: a kinetic approach to study the durability of catalysts, Catalysis Science & Technology, The Royal Society of Chemistry, Vol. 5, No. 1, pp. 475-483, 2015.  Official location  
• Azhagumuthu Muthukrishnan, Yuta Nabae, Cha Wen Chang, Takeyoshi Okajima, Takeo Ohsaka. A high-performance Fe and nitrogen doped catalyst derived from diazoniapentaphene salt and phenolic resin mixture for oxygen reduction reaction, Catalysis Science & Technology, The Royal Society of Chemistry, Vol. 5, No. 3, pp. 1764-1774, 2015.  Official location  
• Awaludin, Z., Safuan, M., TAKEYOSHI OKAJIMA, Ohsaka, T.. Investigating the physical and electrochemical effects of cathodic polarization treatment on TaO_x, Journal of Materials Chemistry A, Vol. 3, No. 32, pp. 16791-16800, 2015.
• Nilushika, D., Awad, M.I., Saleh, M.M., TAKEYOSHI OKAJIMA, Mao, L., Ohsaka, T.. A novel fabrication of a polymeric ionic liquid hybrid film modified electrode and its successful application to the electrogeneration of a superoxide anion in aqueous media, Chemical Communications, Vol. 51, No. 16, pp. 3343-3346, 2015.
• Awaludin, Z., TAKEYOSHI OKAJIMA, Ohsaka, T.. Electroreduced tantalum pentaoxide for hydrogen evolution reaction, Chemistry Letters, Vol. 43, No. 8, pp. 1248-1250, 2014.
• Patil, B., Kobayashi, Y., Fujikawa, S., TAKEYOSHI OKAJIMA, Mao, L., Ohsaka, T.. Direct electrochemistry and intramolecular electron transfer of ascorbate oxidase confined on l-cysteine self-assembled gold electrode, Bioelectrochemistry, Vol. 95, pp. 15-22, 2014.
• Kanazawa, A., Daisaku, T., TAKEYOSHI OKAJIMA, Uchiyama, S., Susumu Kawauchi, Ohsaka, T.. Characterization by electrochemical and X-ray photoelectron spectroscopic measurements and quantum chemical calculations of N-containing functional groups introduced onto glassy carbon electrode surfaces by electrooxidation of a carbamate salt in aqueous, Langmuir, Vol. 30, No. 18, pp. 5297-5305, 2014.
• Awaludin, Z., TAKEYOSHI OKAJIMA, Ohsaka, T.. Preparation of reduced tantalum pentoxide by electrochemical technique for oxygen reduction reaction, Journal of Power Sources, Vol. 268, pp. 728-732, 2014.
• Li, D.-A., TAKEYOSHI OKAJIMA, Mao, L., Ohsaka, T.. Bioelectrocatalytic oxygen reduction reaction by bilirubin oxidase adsorbed on glassy carbon and edge-plane pyrolytic graphite electrodes: Effect of redox mediators, International Journal of Electrochemical Science, Vol. 9, No. 3, pp. 1390-1398, 2014.
• Zhang, D., TAKEYOSHI OKAJIMA, Lu, D., Ohsaka, T.. Electroless deposition of platinum nanoparticles in room-temperature ionic liquids, Langmuir, Vol. 29, No. 38, pp. 11931-11940, 2013.
• Awaludin, Z., TAKEYOSHI OKAJIMA, Ohsaka, T.. Formation of Pt-Li alloy and its activity towards formic acid oxidation, Electrochemistry Communications, Vol. 31, pp. 100-103, 2013.
• Sheng Moo, J.G., Awaludin, Z., TAKEYOSHI OKAJIMA, Ohsaka, T.. An XPS depth-profile study on electrochemically deposited TaOx, Journal of Solid State Electrochemistry, Vol. 17, No. 12, pp. 3115-3123, 2013.
• Awaludin, Z., Sheng Moo, J.G., TAKEYOSHI OKAJIMA, Ohsaka, T.. TaOx-capped Pt nanoparticles as active and durable electrocatalysts for oxygen reduction, Journal of Materials Chemistry A, Vol. 1, No. 46, pp. 14754-14765, 2013.
• Rahman, M.R., Awad, M.I., Kitamura, F., TAKEYOSHI OKAJIMA, Ohsaka, T.. A comparative study of ORR at the Pt electrode in ammonium ion-contaminated H 2SO 4 and HClO 4 solutions, Journal of Power Sources, Vol. 220, pp. 65-73, 2012.
• Wang, X., Li, D., Watanabe, T., Shigemori, Y., Mikawa, T., TAKEYOSHI OKAJIMA, Mao, L., Ohsaka, T.. A glucose/O 2 biofuel cell using recombinant thermophilic enzymes, International Journal of Electrochemical Science, Vol. 7, No. 2, pp. 1071-1078, 2012.
• Masud J., Alam M.T., Awaludin Z., El-Deab M.S., TAKEYOSHI OKAJIMA, Ohsaka T.. Electrocatalytic oxidation of methanol at tantalum oxide-modified Pt electrodes, Journal of Power Sources, Vol. 220, pp. 399-404, 2012.
• Patil, B., Fujikawa, S., TAKEYOSHI OKAJIMA, Ohsaka, T.. Enzymatic direct electron transfer at ascorbate oxidase-modified gold electrode prepared by one-step galvanostatic method, International Journal of Electrochemical Science, Vol. 7, No. 6, pp. 5012-5019, 2012.
• Masud, J., Alam, M.T., Miah, M.R., TAKEYOSHI OKAJIMA, Ohsaka, T.. Enhanced electrooxidation of formic acid at Ta2O 5-modified Pt electrode, Electrochemistry Communications, Vol. 13, No. 1, pp. 86-89, 2011.
• Alam, M.T., Masud, J., Islam, M.M., TAKEYOSHI OKAJIMA, Ohsaka, T.. Differential capacitance at Au(111) in 1-alkyl-3-methylimidazolium tetrafluoroborate based roomerature ionic liquids, Journal of Physical Chemistry C, Vol. 115, No. 40, pp. 19797-19804, 2011.
• Saleh, F.S., TAKEYOSHI OKAJIMA, Kitamura, F., Mao, L., Ohsaka, T.. Poly(phenosafranin)-functionalized single-walled carbon nanotube as nanocomposite electrocatalysts: Fabrication and electrocatalysis for NADH oxidation, Electrochimica Acta, Vol. 56, No. 13, pp. 4916-4923, 2011.
• Islam, M.M., Ferdousi, B.N., TAKEYOSHI OKAJIMA, Ohsaka, T.. Liquid chromatographic separation and simultaneous analyses of peroxycitric acid and citric acid coexisting with hydrogen peroxide in the equilibrium mixture, Journal of Chromatographic Science, Vol. 49, No. 1, pp. 40-45, 2011.
• Saleh, F.S., Rahman, M.R., TAKEYOSHI OKAJIMA, Mao, L., Ohsaka, T.. Determination of formal potential of NADH/NAD+redox couple and catalytic oxidation of NADH using poly(phenosafranin)-modified carbon electrodes, Bioelectrochemistry, Vol. 80, No. 2, pp. 121-127, 2011.
• Awaludin, Z., Suzuki, M., Masud, J., TAKEYOSHI OKAJIMA, Ohsaka, T.. Enhanced electrocatalysis of oxygen reduction on Pt/TaO x/GC, Journal of Physical Chemistry C, Vol. 115, No. 51, pp. 25557-25567, 2011.
• Rahman, M.R., Saleh, F.S., TAKEYOSHI OKAJIMA, Ohsaka, T.. PH dependence of the size and crystallographic orientation of the gold nanoparticles prepared by seed-mediated growth, Langmuir, Vol. 27, No. 8, pp. 5126-5135, 2011.
• Zhang, D., Chang, W.C., TAKEYOSHI OKAJIMA, Ohsaka, T.. Electrodeposition of platinum nanoparticles in a room-temperature ionic liquid, Langmuir, Vol. 27, No. 23, pp. 14662-14668, 2011.
• Masud, J., Alam, T.M., TAKEYOSHI OKAJIMA, Ohsaka, T.. Catalytic electrooxidation of formaldehyde at Ta2O 5-modified Pt electrodes, Chemistry Letters, Vol. 40, No. 3, pp. 252-254, 2011.
• Abdullah, A.M., Mohammad, A.M., TAKEYOSHI OKAJIMA, Kitamura, F., Ohsaka, T.. Effect of relative humidity on temperature and current distributions within a segmented H2/air PEM fuel cell, ECS Transactions, Vol. 35, No. 34, pp. 293-302, 2011.
• Oyama, T., Yamaguchi, S., TAKEYOSHI OKAJIMA, Ohsaka, T., Oyama, N.. Time-differential frequency response of electrochemical quartz crystal electrode during the dissolution and deposition processes of Au in H2SO4solution containing chloride ion, Journal of Electroanalytical Chemistry, Vol. 659, No. 1, pp. 36-42, 2011.
• Saleh, F.S., Rahman, M.R., Kitamura, F., TAKEYOSHI OKAJIMA, Mao, L., Ohsaka, T.. A Simple and Effective Way to Integrate Nile Blue Covalently onto Functionalized SWCNTs Modified GC Electrodes for Sensitive and Selective Electroanalysis of NADH, Electroanalysis, Vol. 23, No. 2, pp. 409-416, 2011.
• TAKEO OHSAKA, TAKEYOSHI OKAJIMA, Ohsaka, T.. Fabrication of Au(III) Nanoparticle-like Electrode through a Seed-Mediated Growth, Chem.Commun., vol. 46, pp. 5172-5174, Sept. 2010.
• TAKEO OHSAKA, Saleh, M.M., Awad, M.I., TAKEYOSHI OKAJIMA, Kitamura, F., Ohsaka, T.. Temperature Effect on the Recovery of SO2-PoisonedGC/Nano-Pt Electrode towards Oxygen Reduction, J.Solid State Electrochem., vol. 14, pp. 1727-1734, July 2010.
• TAKEO OHSAKA, Awad, M.I., El-Deab, M.S., TAKEYOSHI OKAJIMA, Ohsaka, T.. Hydrogen Spillover Phenomenon:Enhanced Reversible Hydrogen Adsorption/Desorption at Ta2O5-Coated Pt Electrode in Acidic Media, Electrochim.Acta, vol. 55, pp. 3528-3536, May 2010.
• Rahman, M.R., TAKEYOSHI OKAJIMA, Ohsaka, T.. Selective detection of As(III) at the Au(111)-like polycrystalline gold electrode, Analytical Chemistry, Vol. 82, No. 22, pp. 9169-9176, 2010.
• Md.M.Islam, T.Imase, T.Okajima, M.Takahashi, Y.Niikura, N.Kawashima, Y.Nakamura, T.Ohsaka. Stability of Superoxide Ion in Imidazolium Cation-Based Room-Temperature Ionic Liquids, J.Phys.Chem.A, Vol. 113, p. 912, Oct. 2009.
• M.T.Alam, Md.M.Islam, T.Okajima, T.Ohsaka. Electrical Double Layer in Mixtures of Room-Temperature Ionic Liquids, J.Phys.Chem.C, Vol. 113, p. 6596, June 2009.
• A.N.Chowdhury, M.T.Alam, T.Okajima, T.Ohsaka. Fabrication of Au(III) Facet Enriched Electrode on Glassy Carbon, J.Electroanal.Chem., Vol. 634, p. 35, Apr. 2009.
• Md.M.Islam, T.Okajima, S.Kojima, T.Ohsaka. Water Electrolysis : An Excellent Approach for the Removal of Water from Ionic Liquids, Chem.Commun., Vol. 42, p. 5330, Oct. 2008.
• A.M.Abdullah, T.Okajima, F.Kitamura, T.Ohsaka. Effect of Operating Conditions on the Acidity of H2/Air PEM Fuel Cells' Water, ECS Transactions, Vol. 16, p. 543, Oct. 2008.
• Md.M.Islam, T.Okajima, T.Ohsaka. In Situ CCD Video and Voltammetric Studies on Enhanced Cathodic Peak Observed at a Hanging Mercury Drop Electrode during Consecutive Two One-Electron Redox Reactions in Aprotic Solutions, J.Electroanal.Chem., Vol. 618, pp. 1-10, Aug. 2008.
• T.Oyama, T.Okajima, T.Ohsaka, S.Yamaguchi, N.Oyama. In Situ Electrochemical Quartz Crystal Microbalance Measurement of Au Deposition and Dissolution in Room-Temperature Ionic Liquid Containing Chloride Ion, Bull.Chem.Soc.Jpn., Vol. 81, No. 6, pp. 726-732, June 2008.
• Md.M.Hossain, Md.M.Islam, S.Ferdousi, T.Okajima, T.Ohsaka. Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle-Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives, Electroanalysis, Vol. 20, p. 2435, June 2008.
• M.S.El-Deab, S.H.Othman, T.Okajima, T.Ohsaka. Non-platinum Electrocatalysts:Manganese Oxide Nanoparticle-Cobaltporphyrin Binary Catalysts for Oxygen Reduction, J.Appl.Electrochem., Vol. 38, pp. 1445-1451, May 2008.
• M.T.Alam, Md.M.Islam, T.Okajima, T.Ohsaka. Cpacitance Measurements in a Series of Room-Temperature Ionic Liquids at Glassy Carbon and Gold Electrode Interfaces, J.Phys. Chem.C, Vol. 112, p. 16600, May 2008.
• A.M.Abdullah, T.Okajima, F.Kitamura, T.Ohsaka. A Simple In Situ Characterization Technique for the Onset of the Chemical Degradation of OEM Fuel Cells' Fluorinated Membranes, Electrochem.Commun., Vol. 10, p. 1732, Apr. 2008.
• M.T.Alam, Md.M.Islam, T.Okajima, T.Ohsaka. Ionic Liquid Structure Dependent Electrical Double Layer at the Mercury Interface, J.Phys.Chem. C, Vol. 112, No. 7, pp. 2601-2606, Mar. 2008.
• A.M.Mohammad, A.I.Abdelrahman, M.S.El-Deab, T.Okajima, T.Ohsaka. On the Aggregation Phenomena of Au Nanoparticles:Effect of Substrate Roughness on the Particle Size, Colloids and Surfaces A : Physicochem. Eng. Aspects, Vol. 318, pp. 78-83, Jan. 2008.
• M.T.Alam, Md.M.Islam, T.Okajima, T.Ohsaka. Measurements of Differential Capacitance at Mercury/Room-Temperature Ionic Liquids Interfaces, J.Phys.Chem.C, Vol. 111, No. 49, pp. 18326-18333, Nov. 2007.
• M.M.Saleh, M.I.Awad, T.Okajima, K.Suga, T.Ohsaka. Characterization of Oxidized Reticulated Vitreous Carbon Electrode for Oxygen Reduction Reaction in Acid Solutions, Electrochim. Acta, Vol. 52, pp. 3095-3104, Nov. 2007.
• Md.M.Islam, M.T.Alam, T.Okajima, T.Ohsaka. Nonlinear Phenomena at Mercury Electrode/Room-Temperature Ionic Liquid(RTIL) Interfaces:Polarographic Streaming Maxima and Current Oscillation, J.Phys.Chem.B, Vol. 111, No. 44, pp. 12849-12856, Oct. 2007.
• B.N.Ferdousi, Md.M.Islam, T.Okajima, T.Ohsaka. Electroreduction of Peroxycitric Acid Coexisting with Hydrogen Peroxide in Aqueous Solution, Electrochim. Acta, Vol. 53, pp. 968-974, Aug. 2007.
• M.T.Alam, Md.M.Islam, T.Okajima, T.Ohsaka. Measurements of Differential Capacitance in Room Temperature Ionic Liquid at Mercury,Glassy Carbon and Gold Electrode Interfaces, Electrochem. Commun., Vol. 9, pp. 2370-2374, July 2007.
• A.M.Abdullah, T.Okajima, A.M.Mohammad, F.Kitamura, T.Ohsaka. Temperature Gradients Measurements within a Segmented Hydrogen Gas/Air PEM Fuel Cell, J.Power Sources, Vol. 172, pp. 209-214, July 2007.
• T.Oyama, T.Okajima, T.Ohsaka. Electrodeposition of Gold at Glassy Carbon Electrodes in Room-Temperature Ionic Liquids, J.Electrochem.Soc., Vol. 154, No. 6, pp. D322-D327, June 2007.
• S.Sata, T.Okajima, F.Kitamura, K.kaneda, T.Ohsaka. Enhanced Hydrogen Adsorption/Desorption Chracteristic of Ta2O5-Coated Pt Electrode Prepared by Electrodeposition of Ta and the Subsequent Calcination, Chem.Lett., Vol. 36, No. 4, pp. 572-573, Apr. 2007.
• A.N.Chowdhury, S.Ferdousi, Md.M.Islam, T.Okajima, T.Ohsaka. Arsenic Detection by Nanogold/Conducting-Polymer-Modified Glassy Carbon Electrodes, J.Appl.Polym.Sci., Vol. 104, pp. 1306-1311, Mar. 2007.
• M.M.Saleh, T.Okajima, M.Hayase, F.Kitamura, T.Ohsaka. Exploring the Effects of Symmetrical and Asymmetrical Relative Humidity on the Performance of Hydrogen Gas/Air PEM Fuel Cell at Different Temperatures, J.Power Sources, Vol. 164, pp. 503-509, Mar. 2007.
• D.Zhang, D.Chi, T.Okajima, T.Ohsaka. Catalytic Activity of Dual Catalysts System Based on Nano-Manganese Oxide and Cobalt Octacyanophthalocyanine toward Four-Electron Reduction of Oxygen in Alkaline Media, Electrochim. Acta, Vol. 52, pp. 5400-5406, Mar. 2007.
• K.Ding, T.Okajima, T.Ohsaka. Acclerated Electron-Transfer Reaction of the Molecular Oxygen/Superoxide Ion Redox Couple on Multi-Walled Carbon Nanotubes- Modified Edge-Plane Pyrolytic Graphite Electroide in Room-Temperature Ionic Liquids, Electrochemistry, Vol. 75, No. 1, pp. 35-38, Jan. 2007.
• Mahmoud M. Saleh, Mohamed I. Awad, Takeyoshi Okajima, Kosaku Suga, Takeo Ohsaka. Characterization of oxidized reticulated vitreous carbon electrode for oxygen reduction reaction in acid solutions, Electrochimica.Acta, Elsevier, Vol. 52, pp. 3095–3104, 2007.
• Takeyoshi Okajima, Takeo Ohsaka. Chemiluminescence of lucigenin by electrogenerated superoxide ions in aqueous solutions, Luminescence, Vol. 18, No. 1, pp. 49-57, 2003.
• Takeyoshi Okajima, Takeo Ohsaka. Chemiluminescence of 3-methylindole based on electrogeneration of superoxide ion in acetonitrile solutions, J. Electroanal. Chem., Vol. 523, No. 1-2, pp. 34-39, 2002.
• Takeyoshi Okajima, Takeo Ohsaka. Chemiluminescence of indole and its derivatives induced by electrogenerated superoxide ion in acetonitrile solutions, Electrochim. Acta, Vol. 47, pp. 1561-1565, 2002.
• Takeyoshi Okajima, Takeo Ohsaka. Electrogenerated chemiluminescence of lucigenin enhanced by the modifications of electrodes with self-assembled monolayers and of solutions with surfactants, J. Electroanal. Chem., Vol. 534, pp. 181-187, 2002.
• M. S. Saha, Y.Che, T.Okajima, T.Kiguchi, Y.Nakamura, K.Tokuta, T.Ohsaka. Current Oscillation Behavior of the O₂/O₂^- Redox Couple at a HMDE in Non-aqueous Aprotic Media, J. Electroanal. Chem., Vol. 496, No. 1+2, pp. 61-68, 2001.
• M.Takahashi, A.Shimizu, T.Karakasa, T.Okajima, T.Ohsaka, N.Kawashima. Studies on Active Oxygen Generation by Addition of Reduced Polyaniline, Material Technology, Vol. 18, No. 8, pp. 317-321, 2000.
• Takeyoshi Okajima, Koichi Tokuda, Takeo Ohsaka. Electrochemical behavior of a Cypridina luciferin analogue in acetonitrile solutions in the presence of proton acceptors, J. Electroanal. Chem., Vol. 476, No. 1, pp. 46-53, 1999.
• S. A. John, Hideo Kasahara, Takeyoshi Okajima, Koichi Tokuda, Takeo Ohsaka. Electrochemical Study on Monomer / Dimer Equilibria of a Series of Asymmetric Viologen Monolayers on the Elecrode Surface in the Plesence of Hexafluorophosphate Ion, J. Electroanal . Chem., Vol. 437, pp. 267-270, 1997.
• Takeyoshi Okajima, Koichi Tokuda, Takeo Ohsaka. Chemiluminescence of a Cypridina Luciferin Analogue by Electrogenerated Superoxide Ion in the Presence of a Lipophilic Ascorbic Acid Derivative, Denki Kagaku ( presently Electrochemistry ), Vol. 64, No. 12, pp. 1276-1279, 1996.
• Takeyoshi Okajima, Koichi Tokuda, Takeo Ohsaka. Chemiluminescence of a Cypridina luciferin analogue by electrogenerated superoxide ion, Biolectrochem. and Bioenerg., Vol. 41, No. 2, pp. 205-208, 1996.
• TAKEYOSHI OKAJIMA. Electrical Equivalent Circuit Parameters for Montmorillonite Clay Film-Coated Quartz Crystal Oscillators in contact with air, Moisture and Electrolyte Solutions, Electrochimica Acta, Vol. 38, No. 6, pp. 747-756, 1993.
• TAKEYOSHI OKAJIMA. Piezoelectric Admittance Measurements of Montmorillonite/Poly(Vinyl alcohol)Composite Film-Coated Quartz Crystal Oscillators, Bull. Chem. Soc. Jpn., Vol. 65, No. 7, pp. 1884-1890, 1992.
• TAKEYOSHI OKAJIMA. Electrode Kinetics of[Ru(NH┣D23┫D2)┣D26┫D2]┣D13+'/, 2+┫D1 Couple Confined in Montmorillonite Clay/Poly(vinyl alcohol)composite Films on Graphite Electrodes and Film Permeation of Electroactive Solution Species, Electrochimica Acta, Vol. 37, No. 10, pp. 1865-1872, 1992.
• TAKEYOSHI OKAJIMA. Electrode Kinetics of the[Fe(CN)┣D26┫D2]┣D1'4'-'/, 3-┫D1 Complex Confined in Cationic Perfluoropolymer Films on Electrode Surfaces, Bull. Chem. Soc. Jpn., Vol. 64, pp. 4, 1991.
• TAKEYOSHI OKAJIMA. Electrode Kinetics of[Ru(NH┣D23┫D2)┣D26┫D2]┣D13+'/, 2+┫D1 Complex Confined in Montmorillonite Clay Coatings on Graphite Electrodes, J. Electroanal. Chem., Vol. 315, pp. 1-2, 1991.

Book

• TAKEO OHSAKA, TAKEYOSHI OKAJIMA. 第4版 現代回面コロイド化学の基礎 原理・応用・測定ソリューション (5.3.6, pp.247-250), 丸善出版, Apr. 2018.
• T.Ohsaka, T.Okajima. 単結晶電極の反応性、第３版 現代界面コロイド化学の基礎、日本化学会編、丸善(株）, 日本化学会編、丸善（株）, p. 199-203, Apr. 2009.
• TAKEO OHSAKA, TAKEYOSHI OKAJIMA. 電気化学測定・解析テクニック＆事例集ー電池/キャパシタ/めっき/センサ、（株）情報機構, （株）情報機構, Mar. 2009.
• 大坂武男, 岡島武義. 表面科学の基礎と応用　3.6.3分子機能電極 ; 日本表面科学会編, (株）NTS, (株）NTS, pp. 1403-1408, 2004.

International Conference (Reviewed)

• Masataka Mashino, Atsunori Ikezawa, Marina Murakami, Takeshi Shimomura, Takeyoshi Okajima, Hajime Arai. Operando XRD Observation of NMC Cathode for Reaction Distribution Analysis Under Fast Discharging, PRiME 2024, Oct. 2024.
• Haruhisa Nakata, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Oxygen Evolution Reaction Activity of Highly Crystalline Hydrated Cobalt Oxyhydroxide Synthesized with Soft Chemistry, PRiME 2024, Oct. 2024.
• Shugo Shimizu, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Quantitative Differential Electrochemical Mass Spectroscopy Analysis of Electrochemical Carbon Corrosion Reactions in Alkaline Electrolyte Solutions, PRiME 2024, Oct. 2024.
• Wang Guanyu, Atsunori Ikezawa, Keiko Waki, Takeyoshi Okajima, Hajime Arai. (Fe, N)-Doped Carbon Black Catalysts for Oxygen Reduction Reaction Applied to Gas-Diffusion Electrodes, PRiME 2024, Oct. 2024.
• Yusuke Kida, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Charge-Discharge Behavior of Spinel-Type Manganese Dioxide for Positive Electrode Materials for Aqueous Proton Batteries, PRiME 2024, Oct. 2024.
• Kotaro Yoshida, Atsunori Ikezawa, Takeyoshi Okajima, Shoma Yanagihara, Saneyuki Ohno, Hajime Arai. Electrochemical Analyses of the Li-Ion Transfer Resistances at the Chloride Solid Electrolyte | Sulfide Solid Electrolyte Interfaces, PRiME 2024, Oct. 2024.
• Tomohiro Osaki, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Elucidation of Degradation Mechanism of Lithium-Ion Batteries Under High Temperature Environment, PRiME 2024, Oct. 2024.
• Liu Rui, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Designing Bifunctional Bilayer Air Electrode for Zinc−Air Batteries , PRiME 2024, Oct. 2024.
• Nanako Nonaka, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Indicators for Optical Analysis of Local Conditions in Bifunctional Air Electrodes, PRiME 2024, Oct. 2024.
• Kota Nakahara, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Effect of Micro- and Mesopore Size on Electronic Structure and Oxygen Reduction Kinetics of Platinum, PRiME 2024, Oct. 2024.
• Atsunori Ikezawa, Kento Imai, Mingqi Xiao, Ryohei Kosasa, Shinji Koito, TAKEYOSHI OKAJIMA, Hajime Arai. Chimie Douce for variety of electrode materials, The 14th Japan-France Joint Seminar on Battery, Sept. 2024.
• Liu Rui, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Designing bifunctional bilayer electrode for Zinc-air batteries, ACEPS12-Asian Conference on Electrochemical Power Sources12, May 2024.
• Wang Guanyu, Atsunori Ikezawa, Keiko Waki, Takeyoshi Okajima, Hajime Arai. (Fe, N)-doped carbon black catalysts formed by rapid thermal annealing for oxygen reduction reaction, ACEPS12-Asian Conference on Electrochemical Power Sources12, May 2024.
• Hajime Arai, Atsunori Ikezawa, Heyang Xing, Teruya Hiramatsu, Yukinori Koyama, Tadaaki Nishizawa, Takeyoshi Okajima. Development of Proton Batteries, ACEPS12-Asian Conference on Electrochemical Power Sources12, May 2024.
• Hajime Arai, Goro Fukunishi, Atsunori Ikezawa, Takeyoshi Okajima. Electrochemistry of all-solidstate cells using reduced lithium titanate as reference electrodes, Asian Conference on Electrochemical Power Sources-ACEPS'11, Dec. 2022.
• Goro Fukunishi, Mayu Tabuchi, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. Electrochemical characteristics and degradation analysis of NCM523 with all solid state three electrode cells, IBA2022, Oct. 2022.
• Goro Fukunishi, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. All-Solid-State Three-Electrode Cells with Reduced Li4 Ti5 O12 Reference Electrode, PRiME 2020, Oct. 2020.
• Atsunori Ikezawa, Goro Fukunishi, Keisuke Shirabe, FUSAO KITAMURA, TAKEYOSHI OKAJIMA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. Behavior of Lithium Cobalt Oxide in Two-and Three-Electrode All-Solid-State Cells, 9th Lithum Battery Discussions, Sept. 2019.

Domestic Conference (Reviewed)

• Ryohei Kosasa, Atsunori Ikezawa, Shigeki Sato, Hiroshi Suyama, Tomoya Matsunaga, TAKEYOSHI OKAJIMA, Hajime Arai. 非解体測定によるBi2O3物理修飾層状水和二酸化マンガン正極の充放電メカニズム解析, 第65回電池討論会, Nov. 2024.
• Kotaro Yoshida, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. 全固体4電極式セルを用いた硫化物系固体電解質接合界面におけるリチウムイオン移動の電気化学測定, 第42回 夏の学校 電気化学会 関東支部, Sept. 2024.
• Kotaro Yoshida, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. 全固体4電極式セルを用いた硫化物系固体電解質接合界面における Li+移動の 電気化学測定, 一般社団法人粉体粉末冶金協会 2024年度春季大会（第133回講演大会）, May 2024.
• Kotaro Yoshida, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. 全固体4極式セルを用いた硫化物系固体電解質接合界面におけるLi+移動の電気化学測定, 電気化学会第91回大会, Mar. 2024.
• Wang Guanyu, Ikezawa Atsunori, Waki Keiko, Okajima Takeyoshi, Arai Hajime. Optimization of (Fe, N)-doped carbon black catalysts formed by rapid thermal annealing for oxygen reduction reaction in alkaline media, 電気化学会第91回大会, Mar. 2024.
• Nanako Nonaka, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. 二機能性空気極内局所状態の光学観察に向けた指示物質の探索, 電気化学会第91回大会, Mar. 2024.
• Kota Nakahara, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. ミクロおよびメソ孔径が白金の電子構造および酸素還元活性に与える影響, 電気化学会第91回大会, Mar. 2024.
• Atsunori Ikezawa, Kensuke Takii, Juri Kida, TAKEYOSHI OKAJIMA, Hajime Arai. 触媒の炭素腐食反応活性に立脚した二機能性空気極の設計, 第64回電池討論会, Nov. 2023.
• Ryohei Kosasa, Atsunori Ikezawa, Shigeki Sato, Hiroshi Suyama, Tomoya Matsunaga, TAKEYOSHI OKAJIMA, Hajime Arai. アルカリ電解液における高結晶性層状水和二酸化マンガン正極の充放電メカニズム解明, 第64回電池討論会, Nov. 2023.
• Teruya Hiramatsu, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. 濃厚酸性水溶液を電解液とするプロトン電池における水素発生反応の抑制, 2023年 電気化学秋季大会, Sept. 2023.
• Yuta Keeda, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. QCMとコンフォーカル光学系を組み合わせたアルカリ水溶液における亜鉛極充放電過程のその場測定, 2023年 電気化学秋季大会, Sept. 2023.
• Kensuke Takii, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. 炭素および酸化物を触媒担体に用いた積層型触媒層を有する二機能性空気極の電気化学特性, 2023年 電気化学秋季大会, Sept. 2023.
• Goro Fukunishi, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. チタン酸リチウム部分還元体を有する参照極を用いた全固体系における黒鉛の電極特性・サイクル特性評価, 第62回電池討論会, Nov. 2021.
• Goro Fukunishi, Mayu Tabuchi, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. チタン酸リチウム部分還元体を有する参照極を用いた全固体系における三元系正極材料の電極特性評価, 第62回電池討論会, Nov. 2021.
• Goro Fukunishi, Mayu Tabuchi, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. チタン酸リチウムのメッシュ型参照極を用いた全固体三極式セルにおけるインピーダンス測定, 2021年 電気化学会第88回大会, Mar. 2021.
• Goro Fukunishi, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, FUSAO KITAMURA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. 還元型チタン酸リチウム参照極を用いる全固体電池用電極のインピーダンス測定と解析, 第61回 電池討論会, Nov. 2020.
• Atsunori Ikezawa, Goro Fukunishi, Keisuke Shirabe, FUSAO KITAMURA, TAKEYOSHI OKAJIMA, Kouta Suzuki, Masaaki Hirayama, Ryoji KANNO, Hajime Arai. 参照極を用いた全固体電池におけるコバルト酸リチウムの挙動解析, 第60回 電池討論会, Nov. 2019.

Other Publication

• TAKEYOSHI OKAJIMA. 第5回 電気化学測定法の基礎(2) : 回転ディスク電極および回転リング-ディスク電極を用いる対流ボルタンメトリー, 電気化学および工業物理化学 : denki kagaku, The Electrochemical Society of Japan, Vol. 81, No. 9, pp. 717-724, Sept. 2013.
• TAKEYOSHI OKAJIMA. 第4回 電気化学測定法の基礎(1) : サイクリックボルタンメトリ, 電気化学および工業物理化学 : denki kagaku, The Electrochemical Society of Japan, Vol. 81, No. 8, pp. 655-658, Aug. 2013.
• T.Okajima, T.Ohsaka. 高分子膜および自己組織化膜（層）（ＳＡＭ）修飾電極, Ｅｌｅｃｔｒｏｃｈｅｍｉｓｔｒｙ, Vol. 76, No. 6, pp. 434-440, June 2008.
• TAKEO OHSAKA, TAKEYOSHI OKAJIMA. スーパーオキシドイオンバイオセンサの開発, 化学工業, Vol. 58, No. 3, pp. 39－45, Mar. 2007.

Patent

• MASA-AKI KAKIMOTO, TAKEO OHSAKA, TAKEYOSHI OKAJIMA, Seizo Miyata, Yuta Nabae. 固体高分子形燃料電池用電極触媒およびその製造方法. Patent. Registered. 国立大学法人東京工業大学, 旭化成株式会社, 帝人株式会社, 東芝燃料電池システム株式会社. 2011/09/09. 特願2011-197050. 2013/03/28. 特開2013-058436. 特許第5893305号. 2016/03/04 2016.
• TAKEO OHSAKA, TAKEYOSHI OKAJIMA. ガス拡散電極およびその製法. Patent. Registered. 国立大学法人東京工業大学, ペルメレック電極株式会社. 2009/06/05. 特願2009-136659. 2010/12/16. 特開2010-280974. 特許第5679639号. 2015/01/16 2015.

Degree

• Kinetic Studies on Charge-Transfer Processes at Polymer-Modified Electrodes,  Thesis,  Doctor of Engineering,  東京工業大学,  1993/--/--, 
• 金属錯体薄膜の電子移動反応解析,  Master of Engineering,  東京農工大学,  1987/--/--, 

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