Quinary defect-rich ultrathin bimetal hydroxide nanosheets for water oxidation

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Title:	Quinary defect-rich ultrathin bimetal hydroxide nanosheets for water oxidation
Authors:	Liu, Z.;Huang, Y. C.;Wang, Y.;Chen, J.;Yang, H.;Chen, X.;Tong, X.;Su, D.;Dong, C. L.;Wang, S.
Keywords:	quinary bimetal hydroxide nanosheets;exfoliation;in situ S;F co-filling;vacancies;electrochemical water oxidation
Date:	2019-11-06
Issue Date:	2020-06-01 12:13:04 (UTC+8)
Abstract:	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.
Relation:	ACS Applied Materials & Interfaces 11(47), p.44018-44025
DOI:	10.1021/acsami.9b10315
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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