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Achieving High-Performance Electrocatalytic Water Oxidation on Ni(OH)2 with Optimized Intermediate Binding Energy
Xiang Chen1,2, Xinyue Xu1, Yuwen Cheng1
1School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243002, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|October 11, 2023
Summary
This study introduces a novel S-doped Ni(OH)2/CeO2 hybrid nanostructure on nickel foam for enhanced oxygen evolution reaction (OER) electrocatalysis. The material exhibits superior activity and durability by optimizing intermediate binding energies.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Nickel-based materials show promise for oxygen evolution reaction (OER) but are limited by strong intermediate binding and high energy barriers.
- Optimizing adsorption energy of reaction intermediates is key to improving electrocatalytic activity.
Purpose of the Study:
- To develop a novel hybrid nanostructure for enhanced OER performance.
- To investigate the effect of sulfur doping and ceria interfacing on Ni(OH)2 electrocatalysts.
- To understand the mechanism of improved OER activity through theoretical calculations.
Main Methods:
- Fabrication of S-doped Ni(OH)2 and CeO2 hybrid nanorod arrays on nickel foam via a one-pot method.
- Electrocatalytic performance testing for oxygen evolution reaction (OER).
- Theoretical calculations to analyze binding energies and reaction pathways.
Main Results:
- The S-Ni(OH)2/CeO2/NF hybrid structure demonstrated remarkable OER activity.
- An ultralow overpotential of 196 mV at 10 mA cm-2 was achieved.
- Excellent long-term durability exceeding 150 hours was observed.
Conclusions:
- Sulfur doping and CeO2 interfacing effectively tune the binding energies of OER intermediates.
- The developed strategy provides a pathway for designing high-performance electrocatalysts for OER.
- The S-Ni(OH)2/CeO2/NF catalyst offers a promising solution for efficient water splitting.
