Issue

Vol. 11 (2019)

Nitrogen-Doped Carbon-Encased Bimetallic Selenide for High-Performance Water Electrolysis

https://doi.org/10.1007/s40820-019-0299-4
Junhui Cao
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Kexin Wang
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Jiayi Chen
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Chaojun Lei
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Bin Yang
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Zhongjian Li
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Lecheng Lei
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Yang Hou
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, People’s Republic of China
Kostya Ostrikov
School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia

Corresponding Author: Yang Hou

yhou@zju.edu.cn

Nano-Micro Letters, Vol. 11 (2019), Article Number: 67

Abstract

Demand of highly efficient earth-abundant transition metal-based electrocatalysts to replace noble metal materials for boosting oxygen evolution reaction (OER) is rapidly growing. Herein, an electrochemically exfoliated graphite (EG) foil supported bimetallic selenide encased in N-doped carbon (EG/(Co, Ni)Se2–NC) hybrid is developed and synthesized by a vapor-phase hydrothermal strategy and subsequent selenization process. The as-prepared EG/(Co, Ni)Se2–NC hybrid exhibits a core–shell structure where the particle diameter of (Co, Ni)Se2 core is about 70 nm and the thickness of N-doped carbon shell is approximately 5 nm. Benefitting from the synergistic effects between the combination of highly active Co species and improved electron transfer from Ni species, and N-doped carbon, the EG/(Co, Ni)Se2–NC hybrid shows remarkable electrocatalytic activity toward OER with a comparatively low overpotential of 258 mV at an current density of 10 mA cm−2 and a small Tafel slope of 73.3 mV dec−1. The excellent OER catalysis performance of EG/(Co, Ni)Se2–NC hybrid is much better than that of commercial Ir/C (343 mV at 10 mA cm−2 and 98.1 mV dec−1), and even almost the best among all previously reported binary CoNi selenide-based OER electrocatalysts. Furthermore, in situ electrochemical Raman spectroscopy combined with ex situ X-ray photoelectron spectroscopy analysis indicates that the superb OER catalysis activity can be attributed to the highly active Co–OOH species and modified electron transfer process from Ni element.


Highlights:


1 N-Doped carbon-encased bimetallic selenide hybrid with strong synergistic effect is constructed.
2 N-Doped carbon-encased bimetallic selenide hybrid exhibits an excellent catalytic activity and stability for oxygen evolution reaction (OER) in alkaline media.
3 The superior OER activity is attributed to the highly active Co–OOH species and modified electron transfer process from Ni atoms.

Keywords

Core–shell structure Bimetallic selenide N-doped carbon Synergistic effect Oxygen evolution reaction
Cao, Junhui, Kexin Wang, Jiayi Chen, Chaojun Lei, Bin Yang, Zhongjian Li, Lecheng Lei, Yang Hou, and Kostya Ostrikov. 2019. “Nitrogen-Doped Carbon-Encased Bimetallic Selenide for High-Performance Water Electrolysis”. Nano-Micro Letters 11 (August):67. https://doi.org/10.1007/s40820-019-0299-4.
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