Tailored synthesis of Zn-N co-doped porous MoC nanosheets towards efficient hydrogen evolution

Qing Cao, Lili Zhao, Aili Wang, Linjing Yang, Linfei Lai, Zhong Li Wang, Jeonghun Kim, Weijia Zhou, Yusuke Yamauchi, Jianjian Lin

科研成果: 期刊稿件文章同行评审

50 引用 (Scopus)

摘要

Developing non-precious metal catalysts with both high efficiency and long-term stability is the top priority for hydrogen evolution reactions (HER). Herein, we present a facile two-step method to synthesize Zn, N co-doped molybdenum carbide nanosheets (Zn-N-MoC-H NSs) by using bi-metal oxides of ZnMoO 4 as a unique precursor. Zn not only serves as a template to form a porous structure on MoC nanosheets during volatilizing at high temperatures, but also acts as a doping source for Zn doping in MoC. The N-containing carbon source realizes N doping of MoC. Benefitting from Zn, N co-doping and the porous nanosheet structure with a large electrochemical surface area, Zn-N-MoC-H NSs lead to enhanced HER activity in an acidic electrolyte (0.5 M H 2 SO 4 ) with a low onset potential of -66 mV vs. RHE (1 mA cm -2 ), overpotential of 128 mV (10 mA cm -2 ), small Tafel slope of 52.1 mV dec -1 and persistent long-term stability. Density functional theory calculations reveal that Zn, N co-doping can synergistically weaken the strong Mo-H bonding, improve absorbed hydrogen atom (H ads ) desorption and lead to faster HER kinetics. This study provides new insights into the use of Zn as a template and electronic regulator toward efficient catalysis and applications in energy storage and conversion.

源语言英语
页(从-至)1700-1709
页数10
期刊Nanoscale
11
4
DOI
出版状态已出版 - 28 1月 2019

指纹

探究 'Tailored synthesis of Zn-N co-doped porous MoC nanosheets towards efficient hydrogen evolution' 的科研主题。它们共同构成独一无二的指纹。

引用此