Surface-Modified Ni–P/Fe Alloys through Annealing for Electrocatalytic Water Splitting in Alkaline Solution

• Published in: MATERIALS TRANSACTIONS Vol. 66; no. 7; pp. 816 - 822
• Main Authors: Choi, Byeongchan, Kim, Yangdo, Kim, Hyoung Chan
• Format: Journal Article
• Language: English
• Published: Sendai The Japan Institute of Metals and Materials 01.07.2025; 公益社団法人 日本金属学会; Japan Science and Technology Agency
• Subjects: annealing; Coated electrodes; electrocatalysis; Electrocatalysts; Electrochemical analysis; Electroless deposition; Electroless plating; Ferrous alloys; Heat treatment; interdiffusion; Iron; Nickel; nickel-iron phosphide; Nyquist plots; oxygen evolution reaction; Oxygen evolution reactions; Phosphides; Stability tests; Water splitting
• ISSN: 1345-9678; 1347-5320
• DOI: 10.2320/matertrans.MT-MB2024008

The present work proposes a low-cost and scalable methodology to produce electrocatalytic layers based on nickel phosphide deposition for oxygen evolution reaction. Through controlled heat treatment, the composition of the Ni–P layer can be tailored to achieve a Ni–Fe–P composite layer, which is expected to enhance the electrochemical catalytic effect. The electrochemical performance of heat-treated electrodes is evaluated by examining the effects of heat treatment temperature and electroless deposition thickness. This study not only demonstrates an innovative approach for constructing heterogeneous interfaces for high-performance electrocatalysts but also hints at the potential extension of this strategy to modulate interfaces between other binary and ternary electrocatalysts, thus propelling the frontier of water splitting technologies.