A universal strategy to synthesize amorphous/crystalline P, Mo dual-doped CoNiS nanostructures for overall water splitting

doi:10.1016/j.jmst.2024.02.082

Abstract

Abstract: In this work, P and Mo dual-doped CoNiS (PMo-CoNiS) nanosheet arrays were successfully constructed through a common solvothermal treatment. The precise doping of P and Mo species into the CoNiS can regulate the microstructures and meanwhile endow with PMo-CoNiS abundant amorphous/crystalline heterointerfaces, which can adjust the electronic structure, thus enhancing the intrinsic activity of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). As a result, ultra-low overpotentials of merely 156 and 58 mV are required to deliver a current density of 10 mA cm^-2 for OER and HER, respectively, and the electrocatalysts PMo-CoNiS also exhibit low Tafel slopes and maintain robust stability for 48 h in alkaline media at a high current density of 50 mA cm^-2. In addition, in an assembled electrolyte cell for overall water splitting, a voltage as low as 1.48 V is sufficient to yield a current density of 10 mA cm^-2. Density functional theory (DFT) calculations further confirmed that the enhanced OER and HER result from the optimized OH* and H* adsorption energy of PMo-CoNiS due to P, Mo dual doping and generated interfacial effect. This work may offer an avenue for designing low-cost bifunctional catalysts with superior catalytic activity and provide a new application strategy for broader applications in various electrocatalytic fields.

Key words: Transition metal sulfides, Dual doping, Amorphous/crystalline hybrid, Water splitting

Xiaodong Yang, Haochen Shen, Xiaoming Xiao, Wei Yang, Zhichao Li, Na Yang, Luhong Zhang. A universal strategy to synthesize amorphous/crystalline P, Mo dual-doped CoNiS nanostructures for overall water splitting[J]. J. Mater. Sci. Technol., 2025, 204: 18-28.

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