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Research Article

Effects of redox-active interlayer anions on the oxygen evolution reactivity of NiFe-layered double hydroxide nanosheets

Daojin Zhou1Zhao Cai1Yongmin Bi1Weiliang Tian1,2Ma Luo1Qian Zhang1Qian Zhang1Qixian Xie1Jindi Wang1Yaping Li1Yun Kuang1Xue Duan1Michal Bajdich3Samira Siahrostami4( )Xiaoming Sun1( )
State Key Laboratory of Chemical Resource EngineeringCollege of EnergyBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China
Key Laboratory of Chemical Engineering in South XinjiangCollege of Life ScienceTarim UniversityAlar843300China
SUNCAT Center for Interface Science and CatalysisSLAC National Accelerator LaboratoryMenlo ParkCalifornia94025USA
SUNCAT Center for Interface Science and CatalysisDepartment of Chemical EngineeringStanford UniversityStanfordCalifornia94305USA
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An erratum to this article is available online at:

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Abstract

Nickel-iron layered double hydroxide (NiFe-LDH) nanosheets have shown optimal oxygen evolution reaction (OER) performance; however, the role of the intercalated ions in the OER activity remains unclear. In this work, we show that the activity of the NiFe-LDHs can be tailored by the intercalated anions with different redox potentials. The intercalation of anions with low redox potential (high reducing ability), such as hypophosphites, leads to NiFe-LDHs with low OER overpotential of 240 mV and a small Tafel slope of 36.9 mV/dec, whereas NiFe-LDHs intercalated with anions of high redox potential (low reducing ability), such as fluorion, show a high overpotential of 370 mV and a Tafel slope of 80.8 mV/dec. The OER activity shows a surprising linear correlation with the standard redox potential. Density functional theory calculations and X-ray photoelectron spectroscopy analysis indicate that the intercalated anions alter the electronic structure of metal atoms which exposed at the surface. Anions with low standard redox potential and strong reducing ability transfer more electrons to the hydroxide layers. This increases the electron density of the surface metal sites and stabilizes their high-valence states, whose formation is known as the critical step prior to the OER process.

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Nano Research
Pages 1358-1368
Cite this article:
Zhou D, Cai Z, Bi Y, et al. Effects of redox-active interlayer anions on the oxygen evolution reactivity of NiFe-layered double hydroxide nanosheets. Nano Research, 2018, 11(3): 1358-1368. https://doi.org/10.1007/s12274-017-1750-9

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Received: 17 May 2017
Revised: 14 June 2017
Accepted: 23 June 2017
Published: 02 February 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany 2017
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