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Issue 32, 2016
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Efficient electrochemical water oxidation in neutral and near-neutral systems with a nanoscale silver-oxide catalyst

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Abstract

In electrocatalytic water splitting systems pursuing for renewable energy using sunlight, developing robust, stable and easily accessible materials operating under mild chemical conditions is pivotal. We present here a unique nanoparticulate type silver-oxide (AgOx-NP) based robust and highly stable electrocatalyst for efficient water oxidation. The AgOx-NP is generated in situ in a HCO3/CO2 system under benign conditions. Micrographs show that they exhibit a nanoscale box type squared nano-bipyramidal configuration. The oxygen generation is initiated at low overpotential, and a sustained O2 evolution current density of >1.1 mA cm−2 is achieved during prolonged-period water electrolysis. The AgOx-NP electrocatalyst performs exceptionally well in metal-ion free neutral or near-neutral carbonate, phosphate and borate buffers relative to recently reported Co-oxide and Ni-oxide based heterogeneous electrocatalysts, which are unstable in metal-ion free electrolytes and tend to deactivate with time and lose catalytic performance during long-term experimental tests.

Graphical abstract: Efficient electrochemical water oxidation in neutral and near-neutral systems with a nanoscale silver-oxide catalyst

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Publication details

The article was received on 17 Apr 2016, accepted on 18 Jul 2016 and first published on 19 Jul 2016


Article type: Paper
DOI: 10.1039/C6NR03147A
Citation: Nanoscale, 2016,8, 15033-15040
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    Efficient electrochemical water oxidation in neutral and near-neutral systems with a nanoscale silver-oxide catalyst

    K. S. Joya, Z. Ahmad, Y. F. Joya, A. T. Garcia-Esparza and H. J. M. de Groot, Nanoscale, 2016, 8, 15033
    DOI: 10.1039/C6NR03147A

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