Affiliation:
1. School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea
2. Department of Chemistry Education, Chonnam National University, Gwangju 500-757, Republic of Korea
Abstract
Microsphere-shaped cobalt selenide (Co0.85Se) structures were efficiently synthesized via a two-step hydrothermal process. Initially, cobalt hydroxide fluoride (Co(OH)F) microcrystals were prepared using a hydrothermal method. Subsequently, Co0.85Se microsphere-like structures were obtained through selenization. Compared to Co(OH)F, the microsphere-like Co0.85Se structure exhibited outstanding catalytic activity for the hydrogen evolution reaction (HER) in a 1.0 M KOH solution. Electrocatalytic experiments demonstrated an exceptional HER performance by the Co0.85Se microspheres, characterized by a low overpotential of 148 mV and a Tafel slope of 55.7 mV dec−1. Furthermore, the Co0.85Se electrocatalyst displayed remarkable long-term stability, maintaining its activity for over 24 h. This remarkable performance is attributed to the excellent electrical conductivity of selenides and the highly electroactive sites present in the Co0.85Se structure compared to Co(OH)F, emphasizing its promise for advanced electrocatalytic applications.
Funder
National Research Foundation of Korea
Korea Institute of Energy Technology Evaluation and Planning
Ministry of Trade, Industry, and Energy, Republic of Korea
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering