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IrW nanobranch as an advanced electrocatalyst for pH-universal overall water splitting


Developing highly efficient and durable electrocatalysts for overall water splitting at a wide range of pHs is of great interest for practical applications, but still remains challenge. Specifically, to the best of our knowledge, a 3-in-1 electrocatalyst that can efficiently catalyze overall water splitting in acidic, alkaline, and neutral electrolytes has not been reported so far. Herein, we report the colloidal synthesis of well-dispersed IrW nanobranches with branch architectures and find that the morphology varies with the amount of W doping. As expected, they exhibit outstanding catalytic performances and durabilities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at all pHs, which are much higher than those of Ir nanoparticles (NPs), and most of the reported state-of-the-art electrocatalysts. More importantly, when further used as both anode and cathode for overall water splitting in 0.1 M HClO4, 0.1 M KOH, and 1.0 M PBS (phosphate buffer solution), the cell voltages of 1.58, 1.60, and 1.73 V are achieved at the current density of 10 mA cm−2, respectively. The present work opens up a new avenue for designing electrocatalysts toward pH-universal overall water splitting, especially for the application in highly corrosive acidic media and neutral media with limited ionic concentration.

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Publication details

The article was received on 25 Feb 2019, accepted on 08 Apr 2019 and first published on 09 Apr 2019

Article type: Paper
DOI: 10.1039/C9NR01690B
Citation: Nanoscale, 2019, Accepted Manuscript

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    IrW nanobranch as an advanced electrocatalyst for pH-universal overall water splitting

    W. Luo, L. Fu, X. Hu, Y. Li and G. Cheng, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR01690B

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