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Selective Reduction–Oxidation Strategy to the Conductivity-Enhancing Ag-Decorated Co-Based 2D Hydroxides as Efficient Electrocatalyst in Oxygen Evolution Reaction

  • Ruohao Dong
    Ruohao Dong
    College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano-Science and Technology, Anhui Normal University, No. 189 South Jiuhua Road, Wuhu 241000, People’s Republic of China
    More by Ruohao Dong
  • Haoran Du
    Haoran Du
    College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano-Science and Technology, Anhui Normal University, No. 189 South Jiuhua Road, Wuhu 241000, People’s Republic of China
    More by Haoran Du
  • Yixuan Sun
    Yixuan Sun
    College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano-Science and Technology, Anhui Normal University, No. 189 South Jiuhua Road, Wuhu 241000, People’s Republic of China
    More by Yixuan Sun
  • Kuangfu Huang
    Kuangfu Huang
    College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano-Science and Technology, Anhui Normal University, No. 189 South Jiuhua Road, Wuhu 241000, People’s Republic of China
  • Wen Li
    Wen Li
    College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano-Science and Technology, Anhui Normal University, No. 189 South Jiuhua Road, Wuhu 241000, People’s Republic of China
    More by Wen Li
  • , and 
  • Baoyou Geng*
    Baoyou Geng
    College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano-Science and Technology, Anhui Normal University, No. 189 South Jiuhua Road, Wuhu 241000, People’s Republic of China
    *B. Geng. Email: [email protected]
    More by Baoyou Geng
Cite this: ACS Sustainable Chem. Eng. 2018, 6, 10, 13420–13426
Publication Date (Web):August 29, 2018
https://doi.org/10.1021/acssuschemeng.8b03153
Copyright © 2018 American Chemical Society
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Abstract

The design and synthesis of high-performance catalysts for oxygen evolution reaction (OER) are crucial for electrocatalysis reaction. In this study, the new Ag-decorated Co-based hydroxides nanosheets with good performance as well as gram-scale yield are prepared by a selective reduction–oxidation method in virtue of the different stability of metal in air. The doping of silver obviously raises the electrical conductivity of the catalysts. Due to the synergistic reaction of the high electrical conductivity and the original active sites, the overpotential of the as-prepared Ag-decorated Co(OH)2 nanosheets is as low as 270 mV at 10 mA/cm2. Compared to the pure Co(OH)2 nansheets, the overpotential decreased about 80 mV at the same current density. Especially, different from the general preparation methods, this process can be carried out at room temperature and does not need any strict condition. And the gram-scale output gives this method potential for industrial production.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acssuschemeng.8b03153.

  • Digital photographs of the samples, SEM and TEM images, LSV curves of Co–Fe, Co–Ni and Co–Zn LDHs with different ratios of transition metal elements, ICP data of Ag-decorated Co(OH)2, chronopotentiometry curve of 10% Ag-decorated Co(OH)2 nanosheets and LSV curves of Ag-decorated Co–Fe, Co–Ni LDHs, stability tests, XPS tests (PDF)

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