期刊
ADVANCED MATERIALS
卷 30, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201802223
关键词
core/shell arrays; hydrogen evolution reaction; molybdenum selenide; nitrogen doping; phase modulation
类别
资金
- National Natural Science Foundation of China [51728204, 51772272, 51502263, 51462008]
- Fundamental Research Funds for the Central Universities [2018QNA4011, 2015XZZX010-02]
- Qianjiang Talents Plan D [QJD1602029]
- Startup Foundation for Hundred-Talent Program of Zhejiang University
- Key Research and Development Program of Hainan Province [ZDYF2017166]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2014A030306048]
- Pearl River SAMP
- T Nova Program of Guangzhou [201610010080]
- US Department of Energy, Basic Energy Sciences, Division of Materials Science and Engineering [DE-AC02-07CH11358]
Tailoring molybdenum selenide electrocatalysts with tunable phase and morphology is of great importance for advancement of hydrogen evolution reaction (HER). In this work, phase- and morphology-modulated N-doped MoSe2/TiC-C shell/core arrays through a facile hydrothermal and postannealing treatment strategy are reported. Highly conductive TiC-C nanorod arrays serve as the backbone for MoSe2 nanosheets to form high-quality MoSe2/TiC-C shell/core arrays. Impressively, continuous phase modulation of MoSe2 is realized on the MoSe2/TiC-C arrays. Except for the pure 1T-MoSe2 and 2H-MoSe2, mixed (1T-2H)-MoSe2 nanosheets are achieved in the N-MoSe2 by N doping and demonstrated by spherical aberration electron microscope. Plausible mechanism of phase transformation and different doping sites of N atom are proposed via theoretical calculation. The much smaller energy barrier, longer HSe bond length, and diminished bandgap endow N-MoSe2/TiC-C arrays with substantially superior HER performance compared to 1T and 2H phase counterparts. Impressively, the designed N-MoSe2/TiC-C arrays exhibit a low overpotential of 137 mV at a large current density of 100 mA cm(-2), and a small Tafel slope of 32 mV dec(-1). Our results pave the way to unravel the enhancement mechanism of HER on 2D transition metal dichalcogenides by N doping.
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