Journal
ELECTROCHIMICA ACTA
Volume 303, Issue -, Pages 231-238Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.02.083
Keywords
Pure CoOOH phase; Highly porous structures; Water oxidation; XAFS; Active phase
Categories
Funding
- Hundred Talent Program of Chinese Academy of Sciences [RENZI[2015] 70HAO, Y5100619AM]
- DICPQIBEBT [UN201804]
- Dalian National Laboratory for Clean Energy (DNL), CAS
- [QIBEBT SZ201801]
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Providing the direct experimental evidence for confirming active and stable phase in cobalt-based electrocatalysts for oxygen evolution reaction (OER) in alkaline medium is crucial to design and fabricate high-performance electrocatalysts. Herein, we report the in situ fabrication of pure cobalt oxyhydroxide (CoOOH) phase with highly porous structures during OER testing process, which exhibits outstanding performance for OER with a low overpotential of 245 mV at 10 mAcm(-2) and retain stable catalytic activity for 250 h with no appreciable decay. Experimental characterizations revealed that the superior catalytic activity of as-formed CoOOH phase mainly arises from the highly porous structures, which endows the electrocatalyst with high specific surface area (similar to 200m(2) g(-1)), numerous accessible channels and abundant active sites. Evidence has been produced showing that the in situ formed pure CoOOH is the active and stable phase in cobalt-based electrocatalysts for OER in alkaline medium. In addition, the synthetic strategy applied here could provide a novel way to fabricate nanoporous structures under mild conditions using electrochemical oxidation method. (c) 2019 Elsevier Ltd. All rights reserved.
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