Issue 47, 2019

Study of active sites on Se-MnS/NiS heterojunctions as highly efficient bifunctional electrocatalysts for overall water splitting

Abstract

Mn-based sulfides have been used in oxygen reduction reactions, lithium-ion batteries and supercapacitors. However, only a few Mn-based catalysts have been reported for OER or HER due to their poor catalytic activity. Mn is commonly used as a dopant to tune the electronic structure of electrocatalysts. It is thus a challenge to achieve highly efficient OER and HER activities for overall water splitting using Mn-based catalysts. In this work, for the first time, we synthesized a Se-MnS/NiS electrocatalyst through facile hydrothermal and chemical deposition treatments. The introduction of the Se dopant could tailor the structure and increase the electrochemically active surface area, favoring the electrocatalysis of HER and OER. Besides, the synergistic effect of the Se-MnS/NiS heterojunctions promoted the adsorption of hydrogen atoms on the surface of the catalyst compared to the NiSe, NiS, and Se-NiS catalysts. The resulting Se-NiS/MnS catalyst required overpotentials as low as 56 mV and 211 mV to deliver a 10 mA cm−2 current density for HER and OER in alkaline media, respectively. Furthermore, Se-MnS/NiS, when directly used as bifunctional electrodes for overall water splitting, exhibited a relatively low voltage of 1.47 V at 10 mA cm−2 and remarkable durability for 48 h. Therefore, it can be considered as one of the promising bifunctional Mn-based electrocatalyst candidates that can replace precious-metal-based electrocatalysts for efficient water splitting.

Graphical abstract: Study of active sites on Se-MnS/NiS heterojunctions as highly efficient bifunctional electrocatalysts for overall water splitting

Supplementary files

Article information

Article type
Paper
Submitted
02 অক্টো. 2019
Accepted
31 অক্টো. 2019
First published
02 নভে. 2019

J. Mater. Chem. A, 2019,7, 26975-26983

Study of active sites on Se-MnS/NiS heterojunctions as highly efficient bifunctional electrocatalysts for overall water splitting

J. Zhu, M. Sun, S. Liu, X. Liu, K. Hu and L. Wang, J. Mater. Chem. A, 2019, 7, 26975 DOI: 10.1039/C9TA10860B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements