From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media

Xu, Xiaomin and Pan, Yangli and Zhong, Yijin and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and Jiang, San Ping and Shao, Zongping (2020) From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media. Composites Part B: Engineering, 198:108214. pp. 1-9. ISSN 1359-8368


Abstract

The discovery of new, inexpensive, and efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solutions holds key to the realization of clean hydrogen production through water electrolysis. While molybdenum (Mo)-based inorganic compounds have been extensively investigated as catalyst candidates toward the alkaline HER, Mo-based oxides, in particular, complex oxides, are rarely explored. Here we report a Mo-containing, metallic BaMoO3 perovskite, which is derived from a scheelite-type, insulating BaMoO4 oxide through a thermal reduction-induced phase transformation, as a potential electrocatalyst for driving the alkaline HER. The BaMoO3 perovskite made of interconnected MoO6 octahedra is found to be more HER-active than the BaMoO4 scheelite consisting of isolated MoO4 tetrahedra, showing a significant increase in intrinsic activity by about one order of magnitude, which is due to the stabilized Mo tetravalent state, the increased surface oxygen vacancy concentration, and the improved electrical conductivity of BaMoO3. Importantly, BaMoO3 exhibits a smaller overpotential to deliver a geometric current density of −10 mA when compared with many of the bulk-sized perovskite catalysts comprising other transition metals (e.g., Mn, Fe, Co, and Ni) and the intensively studied Mo-based catalysts (e.g., MoS2), making it highly promising as an alternative electrocatalyst for the alkaline HER.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 05 Jan 2021 02:01
Last Modified: 19 Jan 2021 04:10
Uncontrolled Keywords: Hydrogen evolution reaction; Metallic BaMoO3; Perovskite; Phase transformation; Scheelite; Water splitting
Fields of Research (2008): 03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030604 Electrochemistry
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030601 Catalysis and Mechanisms of Reactions
09 Engineering > 0904 Chemical Engineering > 090402 Catalytic Process Engineering
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion
34 CHEMICAL SCIENCES > 3406 Physical chemistry > 340604 Electrochemistry
Socio-Economic Objectives (2008): B Economic Development > 85 Energy > 8503 Preparation and Production of Energy Sources > 850303 Hydrogen Production from Renewable Energy
Socio-Economic Objectives (2020): 17 ENERGY > 1707 Processing of energy sources > 170704 Hydrogen production from renewable energy
Identification Number or DOI: https://doi.org/10.1016/j.compositesb.2020.108214
URI: http://eprints.usq.edu.au/id/eprint/40368

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