1D/2D core-shell structure Ni-Mo-S@NiFe LDH grown on nickel foam: a bifunctional electrocatalyst for efficient oxygen evolution and urea oxidation reactions

Tengfei Zhang; Dan Xu; Ping Liu; Huan Liu; Long Chen; Tiantian Gu; Feng Yu; Yanyan Liu; Gang Wang

doi:10.1039/d3dt03088a

1D/2D core-shell structure Ni-Mo-S@NiFe LDH grown on nickel foam: a bifunctional electrocatalyst for efficient oxygen evolution and urea oxidation reactions

Dalton Trans. 2023 Dec 12;52(48):18287-18294. doi: 10.1039/d3dt03088a.

Authors

Tengfei Zhang¹, Dan Xu¹, Ping Liu¹, Huan Liu¹, Long Chen¹, Tiantian Gu¹, Feng Yu¹, Yanyan Liu¹, Gang Wang¹

Affiliation

¹ School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China. wanggang@shzu.edu.cn.

PMID: 37997775
DOI: 10.1039/d3dt03088a

Abstract

The construction of bifunctional catalysts for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR) is important for accelerating the development of the hydrogen economy. Herein, a novel three-dimensional core-shell heterostructure (Ni-Mo-S@NiFeLDH/NF) was prepared by vertically growing NiFe layered double hydroxide (NiFe LDH) nanosheets on nickel foam (NF)-supported arrays of Ni-Mo-S (Ni₃S₂, Ni_0.96S, Mo₂S₃) nanorods via a hydrothermal-sulfide-hydrothermal process. Benefiting from the unique core-shell structure with numerous exposed active sites, the optimized Ni-Mo-S@NiFe LDH/NF shows excellent OER/UOR activity, with an overpotential of only 274 mV for OER to reach 100 mA cm^-2 and 1.318 V for UOR to reach 10 mA cm^-2. Moreover, the assembled Ni-Mo-S@NiFe LDH||Pt/C urea electrolytic system requires only 1.348 V to achieve 10 mA cm^-2, as much as 159 mV lower than pure water electrolysis. This work provides an idea for researching NiFe LDH-based OER/UOR bifunctional catalysts.