Industrially promising NiCoP nanorod arrays tailored with trace W and Mo atoms for boosting large-current-density overall water splitting

被引：45

作者：

Guo, Xin ^{[1
]}

Li, Menggang ^{[1
]}

He, Lin ^{[1
]}

Geng, Shuo ^{[1
]}

Tian, Fenyang ^{[1
]}

Song, Ying ^{[1
]}

Yang, Weiwei ^{[1
]}

Yu, Yongsheng ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Chem & Chem Engn, MIIT Key Lab Crit Mat Technol New Energy Convers, Harbin 150001, Heilongjiang, Peoples R China

来源：

NANOSCALE | 2021年 / 13卷 / 33期

基金：

中国国家自然科学基金;

关键词：

BIFUNCTIONAL ELECTROCATALYST; ELECTRONIC-STRUCTURE; NANOSHEET ARRAYS; HIGHLY EFFICIENT; EVOLUTION; NI; PHOSPHIDES; VACANCIES; CATALYST; OXIDE;

D O I：

10.1039/d1nr03186d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanoarray catalysts supported on substrates provide an opportunity for industrially promising overall water splitting at large current densities. However, most of the present electrocatalysts show high overpotentials at a large current density, inducing a low efficiency for industrial water electrolysis. Herein, using the classic NiCoP nanorod arrays as the basic catalyst model, we presented a trace W and Mo co-doped strategy to boost the overall water splitting electrocatalysis at an industrial current density. After a trace amount of W and Mo atoms was doped, the constructed W and Mo co-doped NiCoP nanorod arrays (W,Mo-NiCoP/NF) show a low overpotential of 249 mV towards the hydrogen evolution reaction (HER) at a very large current density of 1000 mA cm(-2). We deduce that the regulation of the electronic structure caused by the trace W and Mo atoms, as well as the intrinsic features of nanoarrays leads to enhanced catalytic activity. In addition, a significant enhancement towards the oxygen evolution reaction (OER) was also achieved by this co-doped strategy. Finally, an overall water splitting device using W,Mo-NiCoP/NF as both the anode and cathode was assembled to exhibit a low cell voltage of 1.85 V at a large current density of 500 mA cm(-2) and an excellent long-term stability within 50 h, better than most of the state-of-the-art bifunctional electrocatalysts yet reported. Our results highlight the significance of trace-doping engineering in industrial water electrolysis.

引用

页码：14179 / 14185

页数：7

共 67 条

[1] Amino-assisted AHMT anchored on graphene oxide as high performance adsorbent for efficient removal of Cr(VI) and Hg(II) from aqueous solutions under wide pH range [J].