MOF-derived Co/Co3O4/C hollow structural composite as an efficient electrocatalyst for hydrogen evolution reaction
- Authors
- Do, Ha Huu; Tekalgne, Mahider Asmare; Tran, Vy Anh; Van Le, Quyet; Cho, Jin Hyuk; Ahn, Sang Hyun; Kim, Soo Young
- Issue Date
- Dec-2022
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Metal-organic frameworks; Cobalt; Cobalt oxide; Electrocatalyst; Hydrogen evolution reaction
- Citation
- FUEL, v.329
- Journal Title
- FUEL
- Volume
- 329
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/86005
- DOI
- 10.1016/j.fuel.2022.125468
- ISSN
- 0016-2361
- Abstract
- Stable, efficient catalysts are crucial for electrochemical water splitting. Metal-organic frameworks (MOFs) can be used to create electrocatalysts meeting these criteria; however, the lack of high-quality electrode materials for the hydrogen evolution reaction impedes their adoption. In this study, a hollow-structured Co/Co3O4/C composite was prepared using a Co-based MOF precursor through a two-step pyrolysis-oxidation process. This composite outperformed nonhollow Co/Co3O4/C structures as well as hollow Co/C and Co3O4/C composites as a catalyst for hydrogen production in alkaline media. It had a low overvoltage of 169 mV at a current density of 10 mA cm(-2) and a moderate Tafel slope of 60.7 mV dec-(1). Moreover, it exhibited remarkable durability with 2000 cycles and 12 h of testing. This can be attributed to the synergistic effect of Co, Co3O4, and the hollow morphological architecture, which promote the dissociation of HO-H bonds, recombination of hydrogen intermediates, and efficient electron transfer. The results of this study are highly promising for the fabrication of cost-effective electrode materials for water splitting.
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Collections - 공과대학 > 화공생명공학과 > 1. Journal Articles
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