催化作用
铱
质子交换膜燃料电池
氧化剂
纳米颗粒
化学
吸附
Atom(片上系统)
阳极
电化学
氢
分子
无机化学
化学工程
纳米技术
材料科学
物理化学
电极
有机化学
嵌入式系统
工程类
计算机科学
作者
Xiaolong Yang,Ying Wang,Xian Wang,Bingbao Mei,Ergui Luo,Li Yang,Qinglei Meng,Jianmin Zhao,Zheng Jiang,Changpeng Liu,Junjie Ge,Xing Wang
标识
DOI:10.1002/anie.202110900
摘要
Proton-exchange membrane fuel cells (PEMFCs) are limited by their extreme sensitivity to trace-level CO impurities, thus setting a strict requirement for H2 purity and excluding the possibility to directly use cheap crude hydrogen as fuel. Herein, we report a proof-of-concept study, in which a novel catalyst comprising both Ir particles and Ir single-atom sites (IrNP @IrSA -N-C) addresses the CO poisoning issue. The Ir single-atom sites are found not only to be good CO oxidizing sites, but also excel in scavenging the CO molecules adsorbed on Ir particles in close proximity, thereby enabling the Ir particles to reserve partial active sites towards H2 oxidation. The interplay between Ir nanoparticles and Ir single-atom centers confers the catalyst with both excellent H2 oxidation activity (1.19 W cm-2 ) and excellent CO electro-oxidation activity (85 mW cm-2 ) in PEMFCs; the catalyst also tolerates CO in H2 /CO mixture gas at a level that is two times better than that of the current best PtRu/C catalyst.
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