塔菲尔方程
过电位
钴
材料科学
电催化剂
化学工程
催化作用
镍
微球
热液循环
化学
电极
冶金
电化学
物理化学
有机化学
工程类
作者
John Anthuvan Rajesh,Jae‐Young Kim,Soon Hyung Kang,Kwang‐Soon Ahn
出处
期刊:Micromachines
[MDPI AG]
日期:2023-10-05
卷期号:14 (10): 1905-1905
摘要
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.
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