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Insights into the efficiency and stability of Cu-based nanowires for electrocatalytic oxygen evolution

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Abstract

Copper oxide nanowires with varying oxidation states are prepared and their activity for water oxidation is studied. The nanowires with a CuO phase are found to be the most active, and their degree of crystallinity is important in achieving efficient water oxidation. For the crystalline CuO nanowires in a weakly basic Na2CO3 electrolyte, a Tafel slope of 41 mV/decade, an overpotential of approximately 500 mV at ~ 10 mA/cm2 (without compensation for the solution resistance), and a faradaic efficiency of nearly 100% are obtained. This electrode maintains a stable current for over 15 h. The low overpotential of 500 mV at 10 mA/cm2, small Tafel slope, long-term stability, and low cost make CuO one of the most promising catalysts for water oxidation. Moreover, the evolution of the CuO nanowire morphology over time is studied by electron microscopy, revealing that the diffusion of Cu ions from the interior of the nanowires to their surface causes the aggregation of individual nanowires over time. However, despite this aggregation, the current density remains nearly constant, because the total electrochemically active surface area of CuO does not change.

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Acknowledgements

The XRD and electron microscopy characterizations were conducted at the Advanced Characterization Nanotechnology Platform of the University of Tokyo, supported by “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. Part of this work was supported by JSPS KAKENHI Grant Number (17H03229), the JSPS Core-to-Core program (Advanced Research Networks type A), Japan (JSPS)-Korea (NRF) Bilateral program and Grants-in-Aids for Specially Promoted Research. The authors thank Prof. Yuichi Ikuhara of the University of Tokyo for his helpful discussion on electron microscopy data. The authors also thank Prof. Kazunari Domen and Prof. Takashi Hisatomi for assistance in determination of the faradaic efficiency. J.Y. thanks the support from China Scholarship Council (No. 201506210091).

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Authors and Affiliations

  1. Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Jun Yu, Qi Cao, J. Kenji Clark & Jean-Jacques Delaunay

  2. Institute of Engineering Innovation, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Bin Feng

  3. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Changli Li

  4. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Jingyuan Liu

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  1. Jun Yu
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Correspondence to Jean-Jacques Delaunay.

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Yu, J., Cao, Q., Feng, B. et al. Insights into the efficiency and stability of Cu-based nanowires for electrocatalytic oxygen evolution. Nano Res. 11, 4323–4332 (2018). https://doi.org/10.1007/s12274-018-2020-1

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