期刊
IONICS
卷 25, 期 2, 页码 785-796出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-018-2775-0
关键词
Metal-organic framework; N,S-codoped carbon; Multi-walled carbon nanotube; Oxygen reduction reaction; Nonprecious metal electrocatalyst
资金
- Chinese National Natural Science Foundation [U1532139, 21476156]
- Ningbo Natural Science Foundation [2017A610059]
- Fundamental Research Funds for the Central Universities of SCUT [2018ZD25]
- Guangdong Provincial Natural Science Foundation [2017A030313092]
- Guangdong Innovative and Entepreneurial Research Team Program [2014ZT05N200]
The hydrothermal reaction of cobalt salt in the presence of 4-pyridyl-tetrathiafulvalene-4-pyridyl (4-py-TTF-4-py) and terephthalic acid (PTA) has been employed for the preparation of a novel metal-organic framework (MOF), i.e., (4-py-TTF-4-py)(2)M-2(PTA)(4) (M = Co2+). The obtained MOF is then used as a starting material for the synthesis of Co nanoparticles embedded in N,S-codoped carbon layer and supported on multi-walled carbon nanotubes (Co@NSC/MWCNTs) through the high-temperature calcination. Specifically, the calcination leads to the formation of N,S-codoped carbon-coated Co nanoparticles with simultaneous growth on the MWCNTs due to decomposition of the MOF. When used as the electrocatalyst, the Co@NSC/MWCNTs are found to have a higher activity for the oxygen reduction reaction (ORR) and follow a four-electron pathway. The catalytic activity of the Co@NSC/MWCNTs is much higher than that of the pure MWCNTs and the MOFs/MWCNTs. Although the Co@NSC/MWCNTs still exhibit slightly higher overpotential for the ORR, it is indeed more kinetically facile than the commercial Pt/C catalyst, as demonstrated by its higher limiting current density and lower Tafel slope. Additionally, the Co@NSC/MWCNTs also show superior stability and better tolerance to methanol crossover and CO poisoning, compared with those of the commercial Pt/C catalyst. These results strongly suggest that the Co@NSC/MWCNTs could be used as one of the most promising ORR electrocatalysts for the ORR with great potential to replace the Pt/C. The work present here opens up a new route for the design of carbon-integrated ORR electrocatalysts with high performance from a great number of available and yet rapidly growing MOFs.
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