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Hierarchically porous Mo-doped Ni-Fe oxide nanowires efficiently catalyzing oxygen/hydrogen evolution reactions

Abstract

Developing cost-effective, active and robust electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte still remains a crucial challenge for boosting efficient conversion of sustainable energy resources. Here, based upon rapid solidification and dealloying inheritance effect, a eutectic-derived self-templating strategy is reported to fabricate hierarchically porous Mo-doped Ni-Fe oxide nanowires for catalyzing overall water splitting. The advanced catalyst exhibits remarkably low overpotential (only requires an overpotential of 231 mV for 10 mA cm-2) and low Tafel slope (39 mV dec-1) towards OER in 1 M KOH. Comparing with the Ni-Fe oxide without Mo-doping, the Mo-doped Ni-Fe oxide nanowires show enhanced activities towards HER with 84 mV less overpotential to drive the current density of 10 mA cm-2. Strikingly, the alkaline electrolyzer assembled by using the Mo-doped Ni-Fe oxide nanowires as both anode and cathode consumes a cell voltage as low as 1.62 V (at 10 mA cm-2). The exceptional properties of the catalyst can be ascribed to its well-designed hierarchically porous nanowire network, enhanced electric conductivity profiting from the remaining Ni metal in the oxide, as well as the synergistic effect of the Mo and Ni-Fe system. These favorable factors concurrently contribute to the boosted active surface area, facilitated electron/electrolyte transport, and accelerated reaction kinetics of water splitting.

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Publication details

The article was received on 14 Jan 2018, accepted on 05 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA00447A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Hierarchically porous Mo-doped Ni-Fe oxide nanowires efficiently catalyzing oxygen/hydrogen evolution reactions

    Y. Chen, C. Dong, J. Zhang, C. Zhang and Z. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00447A

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