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

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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-NiFeOxHy) 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-NiFeOxHy@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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Acknowledgements

This work was financially supported by the Australian Research Council (ARC) Discovery Project, the National Natural Science Foundation of China (Nos. 51372248 and 51432009) and Griffith University New Researcher Grant (NRG).

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  1. Huajie Yin and Lixue Jiang contributed equally to this work.

Authors and Affiliations

  1. Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, Southport, Queensland, 4222, Australia

    Huajie Yin, Lixue Jiang, Porun Liu, Mohammad Al-Mamun, Yun Wang, Yu Lin Zhong, Huagui Yang, Dan Wang, Zhiyong Tang & Huijun Zhao

  2. Centre for Environmental and Energy Nanomaterials, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Huijun Zhao

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  1. Huajie Yin
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Yin, H., Jiang, L., Liu, P. et al. Remarkably enhanced water splitting activity of nickel foam due to simple immersion in a ferric nitrate solution. Nano Res. 11, 3959–3971 (2018). https://doi.org/10.1007/s12274-017-1886-7

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