A tailored double perovskite nanofiber catalyst enables ultrafast oxygen evolution

Bote Zhao, Lei Zhang, Dongxing Zhen, Seonyoung Yoo, Yong Ding, Dongchang Chen, Yu Chen, Qiaobao Zhang, Brian Doyle, Xunhui Xiong and Meilin Liu ()
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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
Meilin Liu: School of Materials Science and Engineering, Georgia Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms14586

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