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Electrosynthesis of Co3O4 and Co(OH)2 ultrathin nanosheet arrays for efficient electrocatalytic water splitting in alkaline and neutral media

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Abstract

The dimensional confinement endows ultrathin nanosheets with unique physical and chemical properties, which have been widely studied for the purpose of developing active electrocatalysts for water splitting. Ultrathin nanosheets are generally synthesized by chemical vapor deposition, exfoliation, or surfactant-assisted synthesis, which either require special equipment and reaction conditions, or is limited by the low yields and the difficulty in controlling the lateral size and structure of the nanosheets. In addition, achieving a high loading of ultrathin nanosheets on the electrodes without compromising their catalytic activity still remains a challenge. Herein, we report a simple electrodeposition method for preparing Co3O4 and Co(OH)2 ultrathin nanosheet arrays (UNA) without using templates or surfactants. The obtained arrays exhibit high activity for oxygen and hydrogen evolution reactions, in both alkaline and neutral media. The electrolyzer based on Co3O4 and Co(OH)2 UNA shows superior activity and stability than that based on IrO2 and Pt/C, which demonstrates the potential of the present electrodeposition method for developing active and stable electrocatalysts for water splitting.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21474094, 81401531) and the Natural Science Foundation of Anhui Province (No. 1508085QH154).

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Authors and Affiliations

  1. CAS Key Laboratory of Soft Matter Chemistry, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China

    Lin Zhang, Bingrui Liu, Ning Zhang & Mingming Ma

  2. Department of Biology and Environmental Engineering, Hefei University, Hefei, 230022, China

    Ning Zhang

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  1. Lin Zhang
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Correspondence to Ning Zhang or Mingming Ma.

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Electrosynthesis of Co3O4 and Co(OH)2 ultrathin nanosheet arrays for efficient electrocatalytic water splitting in alkaline and neutral media

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Zhang, L., Liu, B., Zhang, N. et al. Electrosynthesis of Co3O4 and Co(OH)2 ultrathin nanosheet arrays for efficient electrocatalytic water splitting in alkaline and neutral media. Nano Res. 11, 323–333 (2018). https://doi.org/10.1007/s12274-017-1634-z

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