Details

Autor(en) / Beteiligte

• Deng, Shengjue
• Yang, Fan
• Zhang, Qinghua
• Zhong, Yu
• Zeng, Yinxiang
• Lin, Shiwei
• Wang, Xiuli
• Lu, Xihong
• Wang, Cai‐Zhuang
• Gu, Lin
• Xia, Xinhui
• Tu, Jiangping

Titel

Phase Modulation of (1T‐2H)‐MoSe2/TiC‐C Shell/Core Arrays via Nitrogen Doping for Highly Efficient Hydrogen Evolution Reaction

Ist Teil von

• Advanced materials (Weinheim), 2018-08, Vol.30 (34), p.e1802223-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• 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 HSe 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. Phase‐ and morphology‐modulated N‐doped MoSe2/TiC‐C shell/core arrays are reported for the first time. The continuous phase modulation of MoSe2 (1T → 2H → 1T‐2H) on the TiC‐C skeleton is realized. In addition, the plausible phase transformation mechanism (1T → 2H → 1T‐2H) and different doping sites of N atom are first proposed. The designed N‐MoSe2/TiC‐C arrays exhibit extraordinary hydrogen evolution reaction performance.