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タイトル
和文: 
英文:Carbon Nitride as a Nonprecious Catalyst for Electrochemical Oxygen Reduction 
著者
和文: Stephen M. Lyth, 難波江 裕太, Shogo Moriya, 黒木 重樹, 柿本 雅明, 尾崎 純一, 宮田 清蔵.  
英文: Stephen M. Lyth, Yuta Nabae, Shogo Moriya, Shigeki Kuroki, Masa-aki Kakimoto, Jun-ichi Ozaki, Seizo Miyata.  
言語 English 
掲載誌/書名
和文: 
英文:The Journal of Physical Chemistry C 
巻, 号, ページ Vol. 113    No. 47    pp. 20148-20151
出版年月 2009年10月 
出版者
和文: 
英文:American Chemical Society 
会議名称
和文: 
英文: 
開催地
和文: 
英文: 
公式リンク http://dx.doi.org/10.1021/jp907928j
 
DOI https://doi.org/10.1021/jp907928j
アブストラクト Nitrogen-doped carbon-based catalysts are increasingly being studied as Pt-free electrodes for oxygen reduction in polymer electrolyte membrane fuel cells. Here, we study the oxygen reduction activity of stoichiometric carbon nitride, which has much higher nitrogen content and is synthesized at lower temperatures, without using ionic or metallic iron. Carbon nitride was studied and characterized via X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, BET specific surface area analysis, and thermogravimetric analysis. Rotating electrode voltammetry in oxygen-saturated sulfuric acid was used to determine the catalytic activity. The onset potential for oxygen reduction by carbon nitride electrodes was 0.69 V (vs NHE) compared to 0.45 V for a carbon black reference electrode. However, the current density was low, possibly due to the low surface area of the material. Blending the carbon nitride with a high surface area carbon black support resulted in a significant improvement in current density and in an increase in onset potential to 0.76 V. The role of surface area was elucidated via cyclic voltammetry. This work confirms that stoichiometric carbon nitride has improved inherent oxygen reduction activity compared to pure carbon, and suggests that Fe coordination sites are not essential for electrochemical oxygen reduction in nitrogen-containing carbon materials.

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