Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 47, Pages 44018-44025Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10315
Keywords
quinary bimetal hydroxide nanosheets; exfoliation; in situ S; F co-filling; vacancies; electrochemical water oxidation
Funding
- Hunan Provincial Innovation Foundation for Postgraduate [CX2018B181]
- National Natural Science Foundation of China [21573066, 21825201, 2187350]
- U.S. DOE Office of Science Facility, at Brookhaven National Laboratory [DE-SC0012704]
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The electronic structure of layered double hydroxides (LDHs) can be modulated by heteroatom doping and creating vacancies. The number of exposed active sites can be enriched by exfoliating the bulk structure into fewer layers. Herein, we successfully achieved multielement doping and exfoliation for Co3Fe LDHs by one SF6-plasma etching step at room temperature (named as Co3Fe LDHs-SF6). The obtained Co3Fe LDHs-SF6 ultrathin nanosheets display outstanding oxygen evolution reaction (OER) activity, which only needs 268 mV overpotential to reach 10 mA cm(-2). Tafel slope and charge transfer resistance are dramatically decreased indicating a faster reaction kinetic rate. The excellent OER activity can be attributed to an increased number of active sites and an optimized electronic structure modulated by the incorporation of electron-withdrawing F, electron-donating S, and abundant vacancies resulting in proper adsorption energy to oxygen species.
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