A NiW2-WO2 / NF composite electrocatalytic material, its preparation method and application

Abstract

This invention relates to the field of electrocatalytic materials technology, specifically to a NiW2-WO2 / NF composite electrocatalytic material, its preparation method, and its applications. This catalytic material is prepared using nickel foam as a substrate through hydrothermal synthesis and hydrogen annealing reduction, forming a three-dimensional tetrahedral porous structure of NiW2 alloy and WO2 composite. This catalytic material exhibits ultra-high active site density, ultra-low charge transfer resistance, and a superhydrophobic surface, achieving a resistance of 10 mA·cm⁻¹. ‑2 and 1000mA·cm ‑2 The overpotentials were 15mV and 280mV, respectively, and the Tafel slope was 41mV·dec. ‑1 And at 500mA·cm ‑2 It operated stably for 500 hours. In-situ infrared spectroscopy confirmed that it can dynamically regulate the interfacial water structure, with four-coordinated hydrogen-bonded water (4HB-H2O) accounting for 35%, which enhances the connectivity of the hydrogen bond network and effectively reduces the water dissociation energy barrier, making it suitable for industrial-grade high-current water electrolysis for hydrogen production.

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