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Nanocomposites Based on CoSe2-Decorated FeSe2 Nanoparticles Supported on Reduced Graphene Oxide as High-Performance Electrocatalysts toward Oxygen Evolution Reaction

  • Guoxing Zhu*
    Guoxing Zhu
    School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
    *E-mail: [email protected] (G.Z.).
    More by Guoxing Zhu
  • Xulan Xie
    Xulan Xie
    School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
    More by Xulan Xie
  • Xiaoyun Li
    Xiaoyun Li
    School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
    More by Xiaoyun Li
  • Yuanjun Liu
    Yuanjun Liu
    School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 202018, China
    More by Yuanjun Liu
  • Xiaoping Shen*
    Xiaoping Shen
    School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
    *E-mail: [email protected] (X.S.).
  • Keqiang Xu
    Keqiang Xu
    School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
    More by Keqiang Xu
  • , and 
  • Shaowei Chen*
    Shaowei Chen
    Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
    *E-mail: [email protected] (S.C.).
    More by Shaowei Chen
Cite this: ACS Appl. Mater. Interfaces 2018, 10, 22, 19258–19270
Publication Date (Web):May 9, 2018
https://doi.org/10.1021/acsami.8b04024
Copyright © 2018 American Chemical Society
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Abstract

FeCo-based materials are promising candidates as efficient, affordable, and sustainable electrocatalysts for oxygen evolution reaction (OER). Herein, a composite based on FeSe2@CoSe2 particles supported on reduced graphene oxide (rGO) was successfully prepared as an OER catalyst. In the catalyst, the CoSe2 phase was located on the FeSe2 surface, forming a large number of exposed heterointerfaces with acidic iron sites because of strong charge interaction between CoSe2 and FeSe2. It is believed that the exposed heterointerfaces act as catalytic active sites for OER via a two-site mechanism, manifesting an overpotential as low as 260 mV to reach the current density of 10 mA cm–2 in 1 M KOH and excellent stability for at least 6 h, which is superior to those of CoSe2/rGO, FeSe2/rGO, as well as most of the FeNi- and FeCo-based electrocatalysts reported in recent literatures. It was demonstrated that the most optimal composite electrocatalysts release more Fe species into the electrolyte during the OER process, whereas the releasing of Co species is negligible. When the FeSe2@CoSe2/rGO catalysts were loaded on a α-Fe2O3 photoanode, the photocurrent density was increased by three times. These results may open up a promising avenue into the design and engineering of highly active and durable catalysts for water oxidation.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b04024.

  • XPS survey scan of the FeSe2@CoSe2/rGO product; detailed XPS spectrum of C 1s and Se 3d; XPS spectra of the catalysts after OER testing; Raman spectra of some hybrid products; SEM and TEM images of FeSe2/rGO and FeSe2@CoSe2/rGO products; LSV curves collected in 0.1 M KOH solution and the corresponding Tafel slopes; EIS measurement of the three contrast catalysts; investigation of the Faradic efficiency; N2 adsorption–desorption isotherms and comparison of the specific surface area for the investigated samples; cyclic voltammogram curves and curves of charging current density differences versus scanning rates; comparison of OER activities for various noble metal-free OER catalysts; and ICP–OES analysis results of FeSe2@CoSe2/rGO products (PDF)

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