Regulating catalytic kinetics in nanoclimbing-wall-like NiO/NiCoP hybrids for enhanced overall water splitting

Abstract

Developing integrated cost-efficient bifunctional electrocatalysts with unique architecture comparable to noble metals is greatly desirable for efficient electrocatalytic water splitting. Herein, a highly active NiO/NiCoP hybrid catalyst on nickel foam (NiO/NiCoP/NF) with a unique nanoclimbing-wall structure is constructed, which is believed to simultaneously improve electron transfer efficiency and catalytic activity. The resultant NiO/NiCoP/NF exhibits outstanding electrocatalytic activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH, featuring low overpotentials of 92 and 216 mV at 10 mA cm−2. A two-electrode system based on NiO/NiCoP/NF‖NiO/NiCoP/NF requires as low as 1.56 V to deliver a current density of 10 mA cm−2. Theoretical calculations and in situ Raman characterization reveal that the positive synergy between NiCoP and NiO endows NiO/NiCoP/NF with accelerated HER and OER kinetics. Moreover, a high solar-to-hydrogen (STH) conversion efficiency ofs up to 12.40% is obtained by using NiO/NiCoP/NF as both the cathode and anode in a solar-driven water splitting system. This work provides a promising strategy for the construction of an innovative bifunctional electrocatalyst for efficient overall water splitting and the establishment of a synergistic catalytic mechanism.

Graphical abstract: Regulating catalytic kinetics in nanoclimbing-wall-like NiO/NiCoP hybrids for enhanced overall water splitting

Supplementary files

Article information

Article type
Paper
Submitted
03 Apr 2024
Accepted
18 Jun 2024
First published
19 Jun 2024

J. Mater. Chem. A, 2024, Advance Article

Regulating catalytic kinetics in nanoclimbing-wall-like NiO/NiCoP hybrids for enhanced overall water splitting

X. Wang, L. Yu, C. Lv, Y. Xie, Y. Jiao, W. Xin, T. Xu, T. Su and L. Yang, J. Mater. Chem. A, 2024, Advance Article , DOI: 10.1039/D4TA02232G

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