Issue 2, 2019

Efficient bifunctional vanadium-doped Ni3S2 nanorod array for overall water splitting

Abstract

Electrochemical water splitting, allowing energy conversion from renewable resources into non-polluting chemical fuels, is vital for future sustainable energy systems, and great efforts have been made for developing efficient and cheap bifunctional electrocatalysts. Herein we report a bifunctional vanadium-doped Ni3S2 nanorod array electrode for overall water splitting in alkaline media. To afford a catalytic current of 10 mA cm−2, the designed V-Ni3S2 electrode only requires overpotentials of 133 mV for hydrogen evolution and 148 mV for oxygen generation, meanwhile showing high long-term stability. The excellent catalytic properties are attributed to the V dopant and geometric advantages of the nanorod array. The V-Ni3S2 electrodes are simultaneously utilized as cathode and anode in one two-electrode cell for overall water splitting, exhibiting a cell voltage of 1.421 V at 10 mA cm−2. The water splitting in this cell can also be feasibly driven by a single-cell AA battery (1.5 V). Our report shows substantial advancement in the exploration of efficient bifunctional electrocatalysts for water splitting.

Graphical abstract: Efficient bifunctional vanadium-doped Ni3S2 nanorod array for overall water splitting

Supplementary files

Article information

Article type
Research Article
Submitted
12 Oct 2018
Accepted
09 Dec 2018
First published
10 Dec 2018

Inorg. Chem. Front., 2019,6, 443-450

Efficient bifunctional vanadium-doped Ni3S2 nanorod array for overall water splitting

J. Guo, K. Zhang, Y. Sun, Q. Liu, L. Tang and X. Zhang, Inorg. Chem. Front., 2019, 6, 443 DOI: 10.1039/C8QI01104D

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