Issue

Vol. 13 (2021)

N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

https://doi.org/10.1007/s40820-021-00607-5
Guangfu Qian
College of Chemistry and Chemical Engineering, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, P. R. China
Jinli Chen
College of Chemistry and Chemical Engineering, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, P. R. China
Tianqi Yu
College of Chemistry and Chemical Engineering, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, P. R. China
Lin Luo
College of Chemistry and Chemical Engineering, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, P. R. China
Shibin Yin
College of Chemistry and Chemical Engineering, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, P. R. China

Corresponding Author: Shibin Yin

yinshibin@gxu.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 77

Abstract

Developing highly effective and stable non-noble metal-based bifunctional catalyst working at high current density is an urgent issue for water electrolysis (WE). Herein, we prepare the N-doped graphene-decorated NiCo alloy coupled with mesoporous NiCoMoO nano-sheet grown on 3D nickel foam (NiCo@C-NiCoMoO/NF) for water splitting. NiCo@C-NiCoMoO/NF exhibits outstanding activity with low overpotentials for hydrogen and oxygen evolution reaction (HER: 39/266 mV; OER: 260/390 mV) at ± 10 and ± 1000 mA cm−2. More importantly, in 6.0 M KOH solution at 60 °C for WE, it only requires 1.90 V to reach 1000 mA cm−2 and shows excellent stability for 43 h, exhibiting the potential for actual application. The good performance can be assigned to N-doped graphene-decorated NiCo alloy and mesoporous NiCoMoO nano-sheet, which not only increase the intrinsic activity and expose abundant catalytic activity sites, but also enhance its chemical and mechanical stability. This work thus could provide a promising material for industrial hydrogen production.


Highlights:


1 N-doped graphene-coated structure and mesoporous nano-sheet can efficiently boost active sites and stability for hydrogen and oxygen evolution reaction.
2 NiCo@C-NiCoMoO/NF exhibits low overpotentials for HER (266 mV) and OER (390 mV) at ± 1000 mA cm−2.
3 For water electrolysis, it can hold at 1000 mA cm−2 for 43 h in 6.0 M KOH + 60 °C condition.

Keywords

N-doped graphene-decorated NiCo alloy Catalyst Mesoporous nano-sheet Water electrolysis High current density
Qian, Guangfu, Jinli Chen, Tianqi Yu, Lin Luo, and Shibin Yin. 2021. “N-Doped Graphene-Decorated NiCo Alloy Coupled With Mesoporous NiCoMoO Nano-Sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density”. Nano-Micro Letters 13 (February):77. https://doi.org/10.1007/s40820-021-00607-5.
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