Structurally ordered intermetallic Ir3V electrocatalysts for alkaline hydrogen evolution reaction. (March 2021)

• Record Type: Journal Article
• Authors: Chen, Lin-Wei; Guo, Xu; Shao, Ru-Yang; Yan, Qiang-Qiang; Zhang, Le-Le; Li, Qun-Xiang; Liang, Hai-Wei
• Is Part Of: Nano energy. Volume 81(2021)
• Publication Date: 2021-03
• Subjects: Electrocatalysts -- Intermetallic compounds -- Hydrogen evolution reaction -- Ir3V -- Water dissociation; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2020.105636
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Electrocatalysis of hydrogen evolution reaction (HER) in alkaline media is critical for the practical implementation of economical water-alkali electrolyzers. However, the sluggish water dissociation kinetics even on platinum-based electrocatalysts result in poor hydrogen-production activities. Here we report a structurally ordered Ir3 V catalyst for efficiently catalyzing HER in alkaline media. The ordered Ir3 V catalyst exhibits a low overpotential of 9.0 mV at 10 mA cm −2 in 1.0 M KOH electrolyte with Ir loading of 19 µg cm −2, corresponding a mass activity of 1200 A gIr −1 at the overpotential of 20 mV, which is 6.7, 9.4, and 3.3 times greater than that of the commercial Pt/C, Ir/C, and disordered Ir3 V catalysts. The enhanced HER kinetics is ascribed to the charge redistribution on the ordered Ir3 V surface with the maximized number of neighboring bimetallic Ir/V sites compared to the disordered solid solution counterpart, which promotes the water dissociation on the electron-deficient V sites. Graphical Abstract: A structurally ordered Ir3 V nanoparticle electrocatalyst with the maximized number of neighboring Ir/V bimetallic sites compared to the disordered solid solution counterpart can efficiently promote the water dissociation and thus enhance the electrocatalytic kinetics for hydrogen evolution in alkaline media. ga1 Highlights: Structurally ordered intermetallic Ir3 V particle catalyst was prepared for catalyzing the HER in alkaline media. The enhanced HER kinetics is ascribed to the charge redistribution on the ordered Ir3 V surface with neighboring Ir/V sites. The charge redistribution promotes the water dissociation on the electron-deficient V sites.