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Facile Synthesis of Microsphere-like Co0.85Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction.

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.

SUBMITTER: Rajesh JA 

PROVIDER: S-EPMC10608889 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature

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Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction.

Rajesh John Anthuvan JA   Kim Jae-Young JY   Kang Soon-Hyung SH   Ahn Kwang-Soon KS  

Micromachines 20231005 10

Microsphere-shaped cobalt selenide (Co<sub>0.85</sub>Se) 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, Co<sub>0.85</sub>Se microsphere-like structures were obtained through selenization. Compared to Co(OH)F, the microsphere-like Co<sub>0.85</sub>Se structure exhibited outstanding catalytic activity for the hydrogen evolution reaction (HER) in a 1.0  ...[more]

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