镍定向双相氮掺杂碳化钼作为在酸性和碱性条件下均有效的析氢催化剂。

Ni-Directed biphase N-doped MoC as an efficient hydrogen evolution catalyst in both acidic and alkaline conditions.

作者信息

Du Cheng-Feng, Wang Yaxin, Zhao Xiangyuan, Wang Jinjin, Wang Xiaomei, Wang Weigang, Yu Hong

机构信息

State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.

Northwestern Polytechnical University Chongqing Technology innovation Center, Chongqing, 400000, P. R. China.

出版信息

Dalton Trans. 2022 Apr 20;51(16):6464-6472. doi: 10.1039/d2dt00449f.

DOI:10.1039/d2dt00449f

PMID:35393992

Abstract

The development of efficient and low-cost catalysts is of great significance for the future application of the electrocatalytic hydrogen evolution reaction (HER). Herein, a series of Ni,N co-doped MoC nanostructures (Ni-MoC/N) with different Ni content levels are fabricated. The phase-directing effect of Ni on MoC/N is observed, which is in charge of the phase transformation of MoC/N from an - to a -phase. At the optimized Ni-doping level, biphase Ni-MoC/N exhibits outstanding HER activity under both acidic and alkaline conditions. In particular, under alkaline conditions, Ni-MoC/N delivers an overpotential of only 105.0 mV, accompanied by a low Tafel slope of 44.96 mV dec. The performance is comparable to commercial 20% Pt/C and higher than most state-of-the-art MoC-based catalysts as well.

摘要

开发高效且低成本的催化剂对于电催化析氢反应（HER）的未来应用具有重要意义。在此，制备了一系列具有不同镍含量水平的镍、氮共掺杂碳化钼纳米结构（Ni-MoC/N）。观察到镍对MoC/N的相导向作用，它负责MoC/N从α相到β相的相变。在优化的镍掺杂水平下，双相Ni-MoC/N在酸性和碱性条件下均表现出出色的析氢活性。特别是在碱性条件下，Ni-MoC/N的过电位仅为105.0 mV，同时具有44.96 mV dec的低塔菲尔斜率。该性能与商业20% Pt/C相当，且也高于大多数最先进的碳化钼基催化剂。