Hemispherical Cavity Cobalt Oxyhydroxides as Oxygen Evolution Electrocatalysts Electrodeposited in Borate-Buffered Solution Using a Polystyrene Colloidal Template Method

Cobalt oxyhydroxide (CoOOH) electrocatalysts with a hemispherical cavity structure were electrodeposited in borate-buffered solution using a polystyrene colloidal template method. The hemispherical-cavity catalysts exhibited higher activity for the oxygen evolution reaction than the corresponding fl...

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Veröffentlicht in:Chemistry letters 2023, Vol.52 (X), p.533-537
Hauptverfasser: Araki, Yusaku, Harada, Kazuki, Miyagi, Nozomu, Tsunekawa, Shun, Ishii, Haruyuki, Matsui, Takanobu, Wang, Ke-Hsuan, Kawai, Takeshi, Yoshida, Masaaki
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container_end_page 537
container_issue X
container_start_page 533
container_title Chemistry letters
container_volume 52
creator Araki, Yusaku
Harada, Kazuki
Miyagi, Nozomu
Tsunekawa, Shun
Ishii, Haruyuki
Matsui, Takanobu
Wang, Ke-Hsuan
Kawai, Takeshi
Yoshida, Masaaki
description Cobalt oxyhydroxide (CoOOH) electrocatalysts with a hemispherical cavity structure were electrodeposited in borate-buffered solution using a polystyrene colloidal template method. The hemispherical-cavity catalysts exhibited higher activity for the oxygen evolution reaction than the corresponding flat thin-film catalysts. Analysis by operando Co K-edge X-ray absorption spectroscopy revealed that, under the electrode working conditions, the local structure of the Co species was composed of nanosized CoOOH clusters with high-oxidation-number Co species. In addition, a B K-edge X-ray absorption spectroscopic analysis showed that borate anions were adsorbed onto the catalysts, stabilizing the catalyst structure. Thus, the highly oxidized CoOOH clusters with adsorbed borate anions are likely to function as active sites, possibly because the clusters are generated around anisotropic Co sites in the catalysts with hemispherical cavities.
doi_str_mv 10.1246/cl.230192
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source Oxford University Press Journals All Titles (1996-Current)
subjects Absorption spectroscopy
Anions
Buffers
Catalysts
Clusters
Cobalt oxyhydroxide
Electrocatalysts
Electrodeposition
Hemispherical cavities
Holes
Oxidation
Oxygen evolution reactions
Polystyrene resins
Thin films
X ray absorption
title Hemispherical Cavity Cobalt Oxyhydroxides as Oxygen Evolution Electrocatalysts Electrodeposited in Borate-Buffered Solution Using a Polystyrene Colloidal Template Method
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