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Ni-Based Electrocatalyst for Water Oxidation Developed In-Situ in a HCO3/CO2 System at Near-Neutral pH

Authors

  • Khurram Saleem Joya,

    Corresponding author
    1. Leiden Institute of Chemistry, Leiden University, RA, Leiden, The Netherlands
    2. Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
    3. Department of Chemistry, University of Engineering and Technology, Lahore, Punjab, Pakistan
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  • Yasir F. Joya,

    1. Faculty of Materials Science and Engineering, Ghulam Ishaq Khan (GIK) Institute of Engineering Sciences and Technology, Topi, Khyber Pakhtunkhaw, Pakistan
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  • Huub J. M. de Groot

    1. Leiden Institute of Chemistry, Leiden University, RA, Leiden, The Netherlands
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Abstract

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Electrochemically generated NiOx nanoworms from a neutral bicarbonate system split water into dioxygen and protons with tremendous efficiency and stability. The NiOx electrocatalyst follows a pH-potential dependence, revealing a PCET (proton coupled electron transfer) mechanism of one electron and one proton oxidation. It does not require proton abstracting phosphate or borate buffers for electrogeneration and catalysis, and shows promising activity for anodic oxidation of water in phosphate, borate, and carbonate buffers.

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