Template-Free Fabrication of Single Atom Fe-Based Cathodes Unlock High-Performing Anion-Exchange Membrane Fuel Cells
英文:
Template-Free Fabrication of Single Atom Fe-Based Cathodes Unlock High-Performing Anion-Exchange Membrane Fuel Cells
著者
和文:
John C. Douglin,
Hideo Notsu,
永田信輔,
Sapir Willdorf-Cohen,
Jinliu Zhong,
Junya Ohyama,
胡家威,
Syeda M. Zahan,
Andres O. Godoy,
Changlai Wang,
Oluwafemi Sanumi,
Masayuki Tsushida,
Karam Yassin,
Jasna Jankovic,
Charles E. Diesendruck,
Yuta Nabae,
Dario R. Dekel.
英文:
John C. Douglin,
Hideo Notsu,
shinsuke nagata,
Sapir Willdorf-Cohen,
Jinliu Zhong,
Junya Ohyama,
Jiawei Hu,
Syeda M. Zahan,
Andres O. Godoy,
Changlai Wang,
Oluwafemi Sanumi,
Masayuki Tsushida,
Karam Yassin,
Jasna Jankovic,
Charles E. Diesendruck,
Yuta Nabae,
Dario R. Dekel.
Abstract Single-atom catalysts (SACs) possessing well-defined active sites of singular metal atoms have gained prominence in the field of electrocatalysis as they can be tuned to enhance activity and stability. In this study, a critical-raw-material (CRM)-free SAC is synthesized for the oxygen reduction reaction (ORR) in alkaline media by pyrolyzing polyimide nanoparticles and Fe without using a sacrificial template. Upon purification, the resulting catalyst demonstrates outstanding performance as cathodes in anion-exchange membrane fuel cells (AEMFCs) owing to sufficiently stabilized Fe single-atoms at the FeN4 sites yielding a peak power density (Pmax) as high as ?1.8 W cm?2 and specific power values up to 11.3 W ${\mathrm{mg}}_{{\mathrm{PGM}}}^{ - 1}$; the latter being the greatest reported among CRM-free cathode AEMFCs. The SAC also shows remarkable in situ durability under a very high current density of 1000?mA cm?2, a first introduced here, with only a 2 mV h?1 decay. Most impressively, when the SAC is combined with a NiMo anode to test a completely CRM-free high-temperature (HT)-AEMFC at 118 ﾂｰC, a Pmax of 372 mW cm?2 and limiting current density of ?1.14 A cm?2 are achieved. This work represents a significant milestone in the development of durable SAC cathode catalysts for the next generation of CRM-free AEMFCs.
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