In:
ChemSusChem, Wiley, Vol. 12, No. 12 ( 2019-06-21), p. 2564-2569
Abstract:
Efficient, abundant and low‐cost catalysts for the oxygen evolution reaction (OER) are required for energy conversion and storage. In this study, a doping–etching route has been developed to access defect rich Fe–Co–Al (Fe–Co–Al‐AE) ternary hydroxide nanosheets for superior electrochemical oxygen evolution. After partial etching of Al, ultrathin Fe 3 Co 2 Al 2 ‐AE electrocatalysts with a rich pore structure are obtained with a shift of the cobalt valence state towards higher valence (Co 2+ →Co 3+ ), along with a substantial improvement in the catalytic performance. Fe 3 Co 2 Al 2 ‐AE shows a notably lower overpotential of only 284 mV at a current density of 10 mA cm −2 and double the OER mass activity of the etching‐free Fe 3 Co 2 Al 2 with an overpotential of 350 mV. Density functional theory shows the leaching of Al changes the rate‐determining step of the OER from conversion of *OOH into O 2 on Fe 3 Co 2 Al 2 to formation of OOH from *O on the Al‐defective catalysts. This work demonstrates an effective route to design and synthesize transition metal electrocatalysts and provides a promising alternative for the further development of oxygen evolution catalysts.
Type of Medium:
Online Resource
ISSN:
1864-5631
,
1864-564X
DOI:
10.1002/cssc.201900831
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
2411405-4
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