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Sandwich-like Co(OH)(x)/Ag/Co(OH)(2) nanosheet composites for oxygen evolution reaction in anion exchange membrane water electrolyzer

Authors
Guo, WenwuKim, JunhyeongKim, HyunkiHan, Gyeong HoJang, Ho WonKim, Soo YoungAhn, Sang Hyun
Issue Date
31-12월-2021
Publisher
ELSEVIER SCIENCE SA
Keywords
Cobalt hydroxide; Oxygen evolution reaction; Silver; Electrodeposition; Sandwich structure; Anion exchange membrane water electrolyzer
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.889
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
889
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135372
DOI
10.1016/j.jallcom.2021.161674
ISSN
0925-8388
Abstract
Development of efficient and durable materials for the oxygen evolution reaction (OER) is essential for hydrogen production via electrocatalytic water splitting. In this study, we demonstrated sandwich-like Co (OH)(x)/Ag/Co(OH)(2) nanosheet composites as efficient OER electrocatalysts in alkaline media. The composites were fabricated on carbon paper (CP) through Ag galvanic displacement on the as-electrodeposited Co(OH)(2) nanosheet layer and subsequent electrodeposition of the second Co(OH)(2) nanosheet layer. Benefiting from the introduction of Ag particles and the unique sandwich structure, the resulting composites exhibited excellent OER activity with the overpotential of 283 mV at the current density of 10 mA/cm(2) and Tafel slope of 97 mV/dec in a 1.0 M KOH. Furthermore, an anion exchange membrane water electrolyzer employing the composite catalyst on CP as the anode, demonstrated a high cell performance with current density of 0.6 A/cm(2) at 1.8 V. (C) 2021 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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