In situ coupled MoO3 with CoP/rGO to construct three-dimensional self-supported catalyst for highly efficient alkaline hydrogen evolution reaction. (30th March 2022)

• Record Type: Journal Article
• Authors: Hou, Zhuoran; Yang, Di; Xin, Yuntao; Huang, Haoyu; Hu, Xin; Guo, Yuyang; Wu, Siduo; Hu, Liwen
• Is Part Of: Journal of materials science & technology. Volume 104(2022)
• Page Start: 194
• Page End: 201
• Publication Date: 2022-03-30
• Subjects: Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.06.047
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: A multi-component self-supporting MoO3 @CoP@rGO composite was successfully synthesized on porous nickel foam. The dense and uniform MoO3 @CoP@rGO on the nickel foam produced synergistic effect and improved its HER-performance. MoO3 @CoP @rGO has very low initial overpotential of only 83 mV and Tafel slope of only 58.5 mV/dec. The DFT calculation provides sufficient theoretical support for this experiment. Abstract: In order to solve the crisis of energy depletion and protect the beautiful natural environment, the development of efficient, cost-effective and stable hydrogen evolution reaction (HER) electrocatalyst has attracted great attention, but it is still an urgent challenge to fabricate an abundant and low cost electrocatalyst. In this article, a novel HER catalyst with heterogeneous structure interfaces was in situ synthesized by multi-step electrodeposition method, and the mechanism of the enhancement of its electrocatalytic activity was elucidated by the combination of density functional theory (DFT) calculation and multi-characterizations. The initial overpotential is only 83 mV and the Tafel slope is only 58.5 mV/dec, which is better than most of other reported CoP-based electrocatalyst. At the meantime, DFT calculations show that the incorporation of MoO3 and rGO leads to electron redistribution among different components, which ensures efficient adsorption and activation of H2 O molecules and hydrogen atoms. Therefore, this work will contribute to the understanding of the mechanisms associated with heterojunctions and provide guidance for the rational design of a hybrid catalyst.