期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201805893
关键词
density functional theory calculations; doped carbon nanotubes; hydrogen evolution reaction; MXenes; polyoxometalate
类别
资金
- National Natural Science Foundation of China [51776094, 51406075, 91733302]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2015A030306044]
- Guangdong-Hong Kong joint innovation project [2016A050503012]
- Training Program for Outstanding Young Teachers at Higher Education Institutions of Guangdong Province [YQ2015151]
- National Key Research and Development Project from the Ministry of Science and Technology of China [2016YFA0202400, 2016YFA0202404, 2016YFB0901600]
- Shenzhen Peacock Team Plan [KQTD2015033110182370]
- Zhejiang Provincial Natural Science Foundation of China [LY18B010001]
- University of Macau [MYRG2018-00142-IAPME, SRG2016-00002-FST, CPG2016-00026-FST]
- Fundo para o Desenvolvimento das Ciencias e da Tecnologia [FDCT/063/2016/A2, FDCT/199/2017/A3]
MXenes and doped carbon nanotubes (CNTs) have entered into research arenas for high-rate energy storage and conversion. Herein, a method of postsynthesis of MXenes in boron, nitrogen codoped CNTs (BNCNTs) is reported with their electrocatalytical hydrogen evolution performance. The encapsulation of hexagonal molybdenum nitrate nanoparticles (h-MoN NPs) into BNCNTs protects h-MoN NPs from agglomeration and poisoning in the complex environment. In principle, the synergism of B and N dopants on the doped CNTs and confined h-MoN NPs produces extremely active sites for electrochemical hydrogen evolution. Density functional theory calculations reveal that the active sites for hydrogen evolution originate from the synergistic effect of h-MoN(001)/CN (graphitic N doping) and h-MoN(001)/BNC. The h-MoN@BNCNT electrocatalyst exhibits a small overpotential of 78 mV at 10 mA cm(-2) and Tafel slope of 46 mV per decade, which are dramatically improved over all reported MoN-based materials and doped CNTs. Additionally, it also exhibits outstanding electrochemical stability in environments with various pH values and seawater media from South China Sea.
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