Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 5, Pages 2958-2966Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.10.216
Keywords
Oxygen evolution reaction; Electrocatalyst; Ga doped Ni3S2; Nanosheet arrays; Ti3C2/Ni foam
Categories
Funding
- National Natural Science Foundation of China [21663029]
- Guangdong University of Technology Hundred Talents Program [220418136]
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In this study, Ga-doped Ni3S2 nanosheet arrays were synthesized and demonstrated excellent catalytic performance for the oxygen evolution reaction (OER). The findings suggest that the modulation of electronic structure and morphology can effectively enhance the activity and durability of the catalyst.
Exploring cost-efficient electrocatalysts for oxygen evolution reaction (OER) is still a huge challenge in the electrochemical energy conversion technology. In this work, Gallium (Ga)doped Ni3S2 nanosheet arrays grown on Ti3C2-MXene/nickel foam (Ga-Ni3S2/Ti3C2/NF) have been synthesized by a successive hydrothermal and sulfidization process. The Ga doping modulates the electronic structure of Ni3S2, so tuning the adsorption energies of oxygen intermediate (*OOH). The Ga-Ni3S2/Ti3C2/NF delivers outstanding catalytic activities toward OER with an overpotential of 340 mV at 100 mA cm(-,) and exhibits superior electrochemical durability. The excellent OER performance of Ga-Ni3S2/Ti3C2/NF can be ascribed to the 3D sheet arrays morphology and optimized electronic structure. Density functional theory (DFT) calculations also demonstrate that electronic disturbance attributed to Ga doping effectively improves the activity of Ni sites, leading to stronger binding strength of *OOH intermediate at Ni sites nearby Ga. This study provides insights into the fabrication of advanced electrocatalysts for application. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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