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Anodically Grown Binder-Free Nickel Hexacyanoferrate Film: Toward Efficient Water Reduction and Hexacyanoferrate Film Based Full Device for Overall Water Splitting
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posted on 2017-05-09, 00:00 authored by Hoa Thi Bui, Nabeen K. Shrestha, Shubhangi Khadtare, Chinna D. Bathula, Lars Giebeler, Yong-Young Noh, Sung-Hwan HanOne
of the challenges in obtaining hydrogen economically by electrochemical
water splitting is to identify and substitute cost-effective earth-abundant
materials for the traditionally used precious-metal-based water-splitting
electrocatalysts. Herein, we report the electrochemical formation
of a thin film of nickel-based Prussian blue analogue hexacyanoferrate
(Ni-HCF) through the anodization of a nickel substrate in ferricyanide
electrolyte. As compared to the traditionally used Nafion-binder-based
bulk film, the anodically obtained binder-free Ni-HCF film demonstrates
superior performance in the electrochemical hydrogen evolution reaction
(HER), which is highly competitive with that shown by a Pt-plate electrode.
The HER onset and the benchmark cathodic current density of 10 mA
cm–2 were achieved at small overpotentials of 15
mV and 0.2 V (not iR-corrected), respectively, in
1 M KOH electrolyte, together with the long-term electrochemical durability
of the film. Further, a metal-HCF-electrode-based full water-splitting
device consisting of the binder-free Ni-HCF film on a Ni plate and
a one-dimensional Co-HCF film on carbon paper as the electrodes for
the HER and the oxygen evolution reaction (OER), respectively, was
designed and was found to demonstrate very promising performance for
overall water splitting.
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Anodically Grown Binder-Free Nickel Hexacyanoferrate FilmNi plateelectrochemical hydrogen evolution reactionbenchmark cathodicwater-splitting deviceCo-HCF filmnickel-based Prussian0.2 VWater Splitting15 mVNafion-binder-based bulk filmHexacyanoferrate Filmferricyanide electrolyteHER onsetwater splittingearth-abundant materialsoxygen evolution reaction1 M KOH electrolytePt-plate electrodenickel substrateelectrochemical water splittingOERcarbon paperEfficient Water Reductionelectrochemical formationprecious-metal-based water-splitting electrocatalystsbinder-free Ni-HCF filmanalogue hexacyanoferrateelectrochemical durabilityFull Device
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