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Volume 2018, Article ID 1341608, 10 pages
https://doi.org/10.1155/2018/1341608
Research Article

Evaluation of A-Site Ba2+-Deficient BaCo0.4Fe0.4Zr0.1Y0.1O Oxides as Electrocatalysts for Efficient Hydrogen Evolution Reaction

1Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
2Department of Physics, Wuhan University, Wuhan, Hubei 430072, China

Correspondence should be addressed to Baomin Xu; nc.ude.ctsus@mbux

Received 28 March 2018; Revised 6 July 2018; Accepted 22 July 2018; Published 12 September 2018

Academic Editor: Masamichi Yoshimura

Copyright © 2018 Xiangnan Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Exploring earth-abundant and cost-effective catalysts with high activity and stability for a hydrogen evolution reaction (HER) is of great importance to practical applications of alkaline water electrolysis. Here, we report on A-site Ba2+-deficiency doping as an effective strategy to enhance the electrochemical activity of BaCo0.4Fe0.4Zr0.1Y0.1O for HER, which is related to the formation of oxygen vacancies around active Co/Fe ions. By comparison with the benchmarking Ba0.5Sr0.5Co0.8Fe0.2O, one of the most spotlighted perovskite oxides, the Ba0.95Co0.4Fe0.4Zr0.1Y0.1O oxide has lower overpotential and smaller Tafel slope. Furthermore, the Ba0.95Co0.4Fe0.4Zr0.1Y0.1O catalyst is ultrastable in an alkaline solution. The enhanced HER performance originated from the increased active atoms adjacent to oxygen vacancies on the surface of the Ba0.95Co0.4Fe0.4Zr0.1Y0.1O catalyst induced by Ba2+-deficiency doping. The low-coordinated active atoms and adjacent oxygen ions may play the role of heterojunctions that synergistically facilitate the Volmer process and thus render stimulated HER catalytic activity. The preliminary results suggest that Ba2+-deficiency doping is a feasible method to tailor the physical and electrochemical properties of perovskite, and that Ba0.95Co0.4Fe0.4Zr0.1Y0.1O is a potential catalyst for HER.