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  • Remarkably enhanced water splitting activity of nickel foam due to simple immersion in a ferric nitrate solution

    Author(s)
    Yin, Huajie
    Jiang, Lixue
    Liu, Porun
    Al-Mamun, Mohammad
    Wang, Yun
    Zhong, Yu Lin
    Yang, Huagui
    Wang, Dan
    Tang, Zhiyong
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Liu, Porun
    Wang, Yun
    Al-Mamun, M
    Yang, Huagui
    Tang, Zhiyong
    Wang, Dan
    Yin, Huajie
    Jiang, Lixue
    Zhong, Yulin
    Year published
    2018
    Metadata
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    Abstract
    The development of a facile method to construct a high-performance electrode is of paramount importance to the application of alkaline water electrolysis. Here, we report that the activity of nickel foam (NF) towards the oxygen evolution reaction (OER) can be enhanced remarkably through simple immersion in a ferric nitrate (Fe(NO3)3) solution at room temperature. During this immersion process, the oxidation of the NF surface by NO3 − ions increases the near-surface concentrations of OH− and Ni2+, which results in the in situ deposition of a highly active amorphous Ni-Fe hydroxide (a-NiFeO x H y ) layer. Specifically, the OER ...
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    The development of a facile method to construct a high-performance electrode is of paramount importance to the application of alkaline water electrolysis. Here, we report that the activity of nickel foam (NF) towards the oxygen evolution reaction (OER) can be enhanced remarkably through simple immersion in a ferric nitrate (Fe(NO3)3) solution at room temperature. During this immersion process, the oxidation of the NF surface by NO3 − ions increases the near-surface concentrations of OH− and Ni2+, which results in the in situ deposition of a highly active amorphous Ni-Fe hydroxide (a-NiFeO x H y ) layer. Specifically, the OER overpotential of the NF electrode decreases from 371 mV (bare NF) to 270 mV (@10 mA·cm−2 in 0.1 M KOH) after immersion in a 20 mM Fe(NO3)3 solution for just 1 min. A longer immersion time results in further increased OER activity (196 mV@10 mA·cm−2 in 1 M KOH). The overall water splitting properties of the a-NiFeO x H y @NF electrode were evaluated using a two-electrode configuration. It is worth noting that the current density can reach 25 mA·cm−2 in 6 M KOH at an applied voltage of 1.5 V at room temperature.
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    Journal Title
    Nano Research
    DOI
    https://doi.org/10.1007/s12274-017-1886-7
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Environmental Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/371616
    Collection
    • Journal articles

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