期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 810, 期 -, 页码 222-231出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.01.013
关键词
Oxygen reduction reaction; Carbide; Carbide-metal-nitrogen/C catalysts; Energy conversion and storage
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [1423454]
- Sao Paulo Research Foundation (FAPESP) [2013/16930-7]
- Sao Paulo Research Foundation [14/22130-6, 17/15304-6, 2014/09087-4]
- RCGI Research Centre for Gas Innovation
- FAPESP [2014/50279-4]
- Shell
Considering the technological importance of the oxygen reduction reaction (ORR) and the cost constraints of highly catalytically active precious metals, recent research efforts have been focused on designing and synthesizing earth abundant non-precious metal catalysts for this reaction. Among recent advances in this area, transition metal-nitrogen modified tungsten carbides can be pointed as prominent candidates as ORR electrocatalysts. Nevertheless, mechanistically understandings of which active sites are responsible for the ORR electrocatalysis on these materials are required for the rational design of suitable materials. In the present work, various tungsten carbides and iron-nitrogen modified tungsten carbides catalysts are synthesized and in-depth characterized through various physical and electrochemical techniques towards gaining insights on the ORR process on these materials in both acidic and alkaline media. High performance materials are developed, with the most active presenting only a ca. 0.060 V increase in the ORR overpotential, compared to a standard platinum catalyst in an alkaline medium. The in-depth analyses allowed for suggestions on reaction pathways for the oxygen reduction on the hybrid Fe/N/WC/C nanomaterials in terms of active sites. These finds might direct further developments in the research on transition metal-nitrogen modified tungsten carbide materials.
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