期刊
ACS CATALYSIS
卷 10, 期 1, 页码 770-776出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b04344
关键词
direct methanol fuel cells; methanol oxidation; methyl formate; formic acid; DEMS; ordered intermetallics
资金
- Air Force Office of Scientific Research [FA9550-18-1-0420]
- National Science Foundation Materials Research Science and Engineering Center (NSF MRSEC) program [DMR-1719875]
- National Natural Science Foundation of China [21573083]
The sluggish methanol oxidation reaction (MOR) remains the biggest challenge for direct methanol fuel cells. To advance our understanding of the MOR mechanism, we have employed dual thin-layer differential electrochemical mass spectrometry (DEMS) to study reaction intermediates on a family of Pt-Fe-Cu ternary ordered intermetallics. We found that PtFe0.7Cu0.3/C exhibited the highest CO2 production efficiency, while PtFe0.5Cu0.5/C generated the largest proportion of methyl formate or formic acid. The different selectivity is partially ascribed to the difference in lattice compressive strain due to the incorporation of Fe and Cu atoms. We propose a dual-pathway mechanism in which the increase in lattice contraction can stabilize the intermediates forming methyl formate or formic acid, while a moderate lattice strain leads to the highest CO2 generation via COad intermediates. Our work on ternary catalysts may provide valuable insights for designing electrocatalysts for the MOR.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据