Issue

Vol. 14 (2022)

Three-Phase Heterojunction NiMo-Based Nano-Needle for Water Splitting at Industrial Alkaline Condition

https://doi.org/10.1007/s40820-021-00744-x
Guangfu Qian
College of Chemistry and Chemical Engineering, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, People’s Republic of China
Jinli Chen
College of Chemistry and Chemical Engineering, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, People’s Republic of China
Tianqi Yu
College of Chemistry and Chemical Engineering, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, People’s Republic of China
Jiacheng Liu
College of Chemistry and Chemical Engineering, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, People’s Republic of China
Lin Luo
College of Chemistry and Chemical Engineering, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, People’s Republic of China
Shibin Yin
College of Chemistry and Chemical Engineering, State Key Laboratory of Processing for Non‑Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, People’s Republic of China

Corresponding Author: Shibin Yin

yinshibin@gxu.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 20

Abstract

Constructing heterojunction is an effective strategy to develop high-performance non-precious-metal-based catalysts for electrochemical water splitting (WS). Herein, we design and prepare an N-doped-carbon-encapsulated Ni/MoO2 nano-needle with three-phase heterojunction (Ni/MoO2@CN) for accelerating the WS under industrial alkaline condition. Density functional theory calculations reveal that the electrons are redistributed at the three-phase heterojunction interface, which optimizes the adsorption energy of H- and O-containing intermediates to obtain the best ΔGH* for hydrogen evolution reaction (HER) and decrease the ΔG value of rate-determining step for oxygen evolution reaction (OER), thus enhancing the HER/OER catalytic activity. Electrochemical results confirm that Ni/MoO2@CN exhibits good activity for HER (ƞ-10 = 33 mV, ƞ-1000 = 267 mV) and OER (ƞ10 = 250 mV, ƞ1000 = 420 mV). It shows a low potential of 1.86 V at 1000 mA cm−2 for WS in 6.0 M KOH solution at 60 °C and can steadily operate for 330 h. This good HER/OER performance can be attributed to the three-phase heterojunction with high intrinsic activity and the self-supporting nano-needle with more active sites, faster mass diffusion, and bubbles release. This work provides a unique idea for designing high efficiency catalytic materials for WS.


Highlights:


1 Three-phase heterojunction can adjust the ∆G of H/O-intermediates to boost catalytic activity.
2 At ± 1000 mA cm−2, Ni/MoO2@CN exhibits low hydrogen/oxygen evolution reaction overpotentials (267/420 mV).
3 Ni/MoO2@CN used as bifunctional electrodes can work at 1000 mA cm−2 for 330 h in 6.0 M KOH + 60 °C condition.

Keywords

Three-phase heterojunction Interfacial electronic redistribution Catalyst Large current density Water splitting
Qian, Guangfu, Jinli Chen, Tianqi Yu, Jiacheng Liu, Lin Luo, and Shibin Yin. 2021. “Three-Phase Heterojunction NiMo-Based Nano-Needle for Water Splitting at Industrial Alkaline Condition”. Nano-Micro Letters 14 (December):20. https://doi.org/10.1007/s40820-021-00744-x.
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