期刊
NATURE MATERIALS
卷 19, 期 11, 页码 1215-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41563-020-0717-5
关键词
-
类别
资金
- Danish National Research Foundation [DNRF 149]
- Innovation Fund Denmark through the ProActivE Project [5160-00003B]
- BMBF [05K16RD1]
- Graduate School of Excellence Energy Science and Engineering [GRC1070]
- Fuel Cells and Hydrogen 2 Joint Undertaking [779366]
- European Union's Horizon 2020 research and innovation programme
- Hydrogen Europe
- Hydrogen Europe Research
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [EXC 2008/1-390540038]
- China Scholarship Council (CSC)
This contribution reports the discovery and analysis of ap-block Sn-based catalyst for the electroreduction of molecular oxygen in acidic conditions at fuel cell cathodes; the catalyst is free of platinum-group metals and contains single-metal-atom actives sites coordinated by nitrogen. The prepared SnNC catalysts meet and exceed state-of-the-art FeNC catalysts in terms of intrinsic catalytic turn-over frequency and hydrogen-air fuel cell power density. The SnNC-NH(3)catalysts displayed a 40-50% higher current density than FeNC-NH(3)at cell voltages below 0.7 V. Additional benefits include a highly favourable selectivity for the four-electron reduction pathway and a Fenton-inactive character of Sn. A range of analytical techniques combined with density functional theory calculations indicate that stannic Sn(iv)N(x)single-metal sites with moderate oxygen chemisorption properties and low pyridinic N coordination numbers act as catalytically active moieties. The superior proton-exchange membrane fuel cell performance of SnNC cathode catalysts under realistic, hydrogen-air fuel cell conditions, particularly after NH(3)activation treatment, makes them a promising alternative to today's state-of-the-art Fe-based catalysts. For oxygen reduction and hydrogen oxidation reactions, proton-exchange membrane fuel cells typically rely on precious-metal-based catalysts. Ap-block single-metal-site tin/nitrogen-doped carbon is shown to exhibit promising electrocatalytic and fuel cell performance.
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