Shao Yuyan, Dodelet Jean-Pol, Wu Gang, Zelenay Piotr
Pacific Northwest National Laboratory, Richland, WA, 99352, USA.
INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel Boulet, Varennes, Quebec, J3X 1S2, Canada.
Adv Mater. 2019 Aug;31(31):e1807615. doi: 10.1002/adma.201807615. Epub 2019 Feb 19.
In recent years, significant progress has been achieved in the development of platinum group metal-free (PGM-free) oxygen reduction reaction (ORR) catalysts for proton exchange membrane (PEM) fuel cells. At the same time the limited durability of these catalysts remains a great challenge that needs to be addressed. This mini-review summarizes the recent progress in understanding the main causes of instability of PGM-free ORR catalysts in acidic environments, focusing on transition metal/nitrogen codoped systems (M-N-C catalysts, M: Fe, Co, Mn), particularly MN moiety active sites. Of several possible degradation mechanisms, demetalation and carbon oxidation are found to be the most likely reasons for M-N-C catalysts/cathodes degradation.
近年来，质子交换膜（PEM）燃料电池的无铂族金属（PGM）氧还原反应（ORR）催化剂的开发取得了重大进展。与此同时，这些催化剂有限的耐久性仍然是一个需要解决的巨大挑战。本综述总结了在理解酸性环境中无PGM的ORR催化剂不稳定性的主要原因方面的最新进展，重点关注过渡金属/氮共掺杂体系（M-N-C催化剂，M：Fe、Co、Mn），特别是MN部分活性位点。在几种可能的降解机制中，脱金属和碳氧化被发现是M-N-C催化剂/阴极降解的最可能原因。
