Construction of NiS@CoFeMoO4/NF nanosheet heterostructures for efficient overall water splitting

• Published in: Journal of alloys and compounds 2023-03, Vol.936, p.168340, Article 168340
• Main Authors: Thiyagarajan, Dhandayuthapani, Thirumurugan, Arun, Lee, Bong-Kee
• Format: Article
• Language: English
• Subjects: Cobalt molybdate; Hydrogen evolution reaction; Nickel sulfide; Oxide/sulfide heterointerface; Oxygen evolution reaction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.168340

Inexpensive and robust earth-abundant electrocatalysts with excellent electrocatalytic reaction kinetics must be developed to realize electrochemical water-splitting. In this study, nickel sulfide@cobalt iron-molybdenum oxide (NiS@CoFeMoO4) nanosheet heterostructures supported on nickel foam were fabricated. The as-built NiS@CoFeMoO4/NF with a sheet-on-sheet morphology delivered a current density of 10 mA cm−2 with a low overpotential of 72 and 200 mV for the hydrogen evolution and oxygen evolution reactions, respectively. The formation of a synergistic heterostructure between NiS and CoFeMoO4/NF via interfacial engineering facilitated the generation of a micro-mesoporous surface and modulation of the charge density at interfaces. Consequently, this configuration outperformed many non-precious-metal-based catalysts as an electrocatalyst for water oxidation. [Display omitted] •Obtained NiS@CoFeMoO4/NF heterostructure via a two-step hydrothermal process.•NiS@CoFeMoO4/NF nanosheet morphology enhances the electrocatalytic kinetics.•NiS@CoFeMoO4/NF electrolyzer delivers a current density of 10 mA cm−2 at 1.58 V.