Electrode reconstruction strategy for oxygen evolution reaction: maintaining Fe-CoOOH phase with intermediate-spin state during electrolysis

Woong Hee Lee, Man Ho Han, Young-Jin Ko, Byoung Koun Min, Keun Hwa Chae () and Hyung-Suk Oh ()
Additional contact information
Woong Hee Lee: Clean Energy Research Center, Korea Institute of Science and Technology (KIST)
Man Ho Han: Clean Energy Research Center, Korea Institute of Science and Technology (KIST)
Young-Jin Ko: Clean Energy Research Center, Korea Institute of Science and Technology (KIST)
Byoung Koun Min: Clean Energy Research Center, Korea Institute of Science and Technology (KIST)
Keun Hwa Chae: Advanced Analysis Center, Korea Institute of Science and Technology (KIST)
Hyung-Suk Oh: Clean Energy Research Center, Korea Institute of Science and Technology (KIST)

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Computational calculations and experimental studies reveal that the CoOOH phase and the intermediate-spin (IS) state are the key factors for realizing efficient Co-based electrocatalysts for the oxygen evolution reaction (OER). However, according to thermodynamics, general cobalt oxide converts to the CoO2 phase under OER condition, retarding the OER kinetics. Herein, we demonstrate a simple and scalable strategy to fabricate electrodes with maintaining Fe-CoOOH phase and an IS state under the OER. The changes of phase and spin states were uncovered by combining in-situ/operando X-ray based absorption spectroscopy and Raman spectroscopy. Electrochemical reconstruction of chalcogenide treated Co foam affords a highly enlarged active surface that conferred excellent catalytic activity and stability in a large-scale water electrolyzer. Our findings are meaningful in that the calculated results were experimentally verified through the operando analyses. It also proposes a new strategy for electrode fabrication and confirms the importance of real active phases and spin states under a particular reaction condition.

Date: 2022
References: Add references at CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
https://www.nature.com/articles/s41467-022-28260-5 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28260-5

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-022-28260-5

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().