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A tailored double perovskite nanofiber catalyst enables ultrafast oxygen evolution

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 a...

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Detalles Bibliográficos
Autores principales: Zhao, Bote, Zhang, Lei, Zhen, Dongxing, Yoo, Seonyoung, Ding, Yong, Chen, Dongchang, Chen, Yu, Zhang, Qiaobao, Doyle, Brian, Xiong, Xunhui, Liu, Meilin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5333368/
https://www.ncbi.nlm.nih.gov/pubmed/28240282
http://dx.doi.org/10.1038/ncomms14586
Descripción
Sumario: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 PrBa(0.5)Sr(0.5)Co(1.5)Fe(0.5)O(5+δ) nanofiber as a highly efficient and robust catalyst for the oxygen evolution reaction. Co-doping of strontium and iron into PrBaCo(2)O(5+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 e(g) electron filling associated with partial surface reduction, as unravelled from chemical titration and electron energy-loss spectroscopy.