催化作用
质子交换膜燃料电池
阳极
氢溢流
电解质
氢
化学工程
材料科学
吸附
可逆氢电极
纳米颗粒
化学
无机化学
电极
纳米技术
有机化学
物理化学
工程类
参比电极
作者
Han Tian,Xu Yu,Weimin Huang,Ziwei Chang,Fenglai Pei,Jiangdong Zhou,Ningning Dai,Ge Meng,Chang Chen,Xiangzhi Cui,Jianlin Shi
出处
期刊:Small
[Wiley]
日期:2023-06-21
卷期号:19 (42)
被引量:6
标识
DOI:10.1002/smll.202303061
摘要
Developing anode catalysts with substantially enhanced activity for hydrogen oxidation reaction (HOR) and CO tolerance performance is of great importance for the commercial applications of proton exchange membrane fuel cells (PEMFCs). Herein, an excellent CO-tolerant catalyst (Pd-WO3 /C) has been fabricated by loading Pd nanoparticles on WO3 via an immersion-reduction route. A remarkably high power density of 1.33 W cm-2 at 80 °C is obtained by using the optimized 3Pd-WO3 /C as the anode catalyst of PEMFCs, and the moderately reduced power density (73% remained) in CO/H2 mixed gas can quickly recover after removal of CO-contamination from hydrogen fuel, which is not possible by using Pt/C or Pd/C as anode catalyst. The prominent HOR activity of 3Pd-WO3 /C is attributed to the optimized interfacial electron interaction, in which the activated H* adsorbed on Pd species can be effectively transferred to WO3 species through hydrogen spillover effect and then oxidized through the H species insert/output effect during the formation of Hx WO3 in acid electrolyte. More importantly, a novel synergetic catalytic mechanism about excellent CO tolerance is proposed, in which Pd and WO3 respectively absorbs/activates CO and H2 O, thus achieving the CO electrooxidation and re-exposure of Pd active sites for CO-tolerant HOR.
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