格式化
催化作用
甲醇
铋
化学
吸附
无机化学
蒸汽重整
反应中间体
化学工程
物理化学
有机化学
工程类
制氢
作者
Xuchun Wang,Yu Liu,Xingyu Ma,Lo‐Yueh Chang,Qixuan Zhong,Qi Pan,Zhiqiang Wang,Xiaolei Yuan,Muhan Cao,Fenglei Lyu,Yao‐Yue Yang,Jinxing Chen,Tsun‐Kong Sham,Qiao Zhang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-01-03
卷期号:23 (2): 685-693
被引量:11
标识
DOI:10.1021/acs.nanolett.2c04568
摘要
While tuning the electronic structure of Pt can thermodynamically alleviate CO poisoning in direct methanol fuel cells, the impact of interactions between intermediates on the reaction pathway is seldom studied. Herein, we contrive a PtBi model catalyst and realize a complete inhibition of the CO pathway and concurrent enhancement of the formate pathway in the alkaline methanol electrooxidation. The key role of Bi is enriching OH adsorbates (OHad) on the catalyst surface. The competitive adsorption of CO adsorbates (COad) and OHad at Pt sites, complementing the thermodynamic contribution from alloying Bi with Pt, switches the intermediate from COad to formate that circumvents CO poisoning. Hence, 8% Bi brings an approximately 6-fold increase in activity compared to pure Pt nanoparticles. This notion can be generalized to modify commercially available Pt/C catalysts by a microwave-assisted method, offering opportunities for the design and practical production of CO-tolerance electrocatalysts in an industrial setting.
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