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A tailored double perovskite nanofiber catalyst enables ultrafast oxygen evolution

Author

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  • Bote Zhao

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Lei Zhang

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Dongxing Zhen

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Seonyoung Yoo

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Yong Ding

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Dongchang Chen

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Yu Chen

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Qiaobao Zhang

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Brian Doyle

    (School of Materials Science and Engineering, Georgia Institute of Technology)

  • Xunhui Xiong

    (School of Materials Science and Engineering, Georgia Institute of Technology
    New Energy Research Institute, School of Environment and Energy, South China University of Technology)

  • Meilin Liu

    (School of Materials Science and Engineering, Georgia Institute of Technology)

Abstract

Rechargeable metal–air batteries and water splitting are highly competitive options for a sustainable energy future, but their commercialization is hindered by the absence of cost-effective, highly efficient and stable catalysts for the oxygen evolution reaction. Here we report the rational design and synthesis of a double perovskite PrBa0.5Sr0.5Co1.5Fe0.5O5+δ nanofiber as a highly efficient and robust catalyst for the oxygen evolution reaction. Co-doping of strontium and iron into PrBaCo2O5+δ is found to be very effective in enhancing intrinsic activity (normalized by the geometrical surface area, ∼4.7 times), as validated by electrochemical measurements and first-principles calculations. Further, the nanofiber morphology enhances its mass activity remarkably (by ∼20 times) as the diameter is reduced to ∼20 nm, attributed to the increased surface area and an unexpected intrinsic activity enhancement due possibly to a favourable eg electron filling associated with partial surface reduction, as unravelled from chemical titration and electron energy-loss spectroscopy.

Suggested Citation

  • Bote Zhao & Lei Zhang & Dongxing Zhen & Seonyoung Yoo & Yong Ding & Dongchang Chen & Yu Chen & Qiaobao Zhang & Brian Doyle & Xunhui Xiong & Meilin Liu, 2017. "A tailored double perovskite nanofiber catalyst enables ultrafast oxygen evolution," Nature Communications, Nature, vol. 8(1), pages 1-9, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14586
    DOI: 10.1038/ncomms14586
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