SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 29 ›› Issue (1): 221-227.DOI: 10.1016/j.cjche.2020.08.008

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

Homogeneous Co3O4 film electrode with enhanced oxygen evolution electrocatalysis via surface reduction

Xiang Li1,2, Bo Yang2, Yaqin Wu2, Saisai Lin1, Lin Zhang1   

  1. 1 Key laboratory of Biomass Chemical Engineering, Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;
    2 Research and Development Center of Water Treatment Technology Co., Ltd., Hangzhou 310012, China
  • 收稿日期:2019-12-17 修回日期:2020-07-13 出版日期:2021-01-28 发布日期:2021-04-02
  • 通讯作者: Bo Yang, Yaqin Wu, Saisai Lin, Lin Zhang
  • 基金资助:
    The work was supported by National Key Research and Development Program of China (2016YFB0600503, 2016YFC0400503, 2016YFC0400506).

Homogeneous Co3O4 film electrode with enhanced oxygen evolution electrocatalysis via surface reduction

Xiang Li1,2, Bo Yang2, Yaqin Wu2, Saisai Lin1, Lin Zhang1   

  1. 1 Key laboratory of Biomass Chemical Engineering, Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;
    2 Research and Development Center of Water Treatment Technology Co., Ltd., Hangzhou 310012, China
  • Received:2019-12-17 Revised:2020-07-13 Online:2021-01-28 Published:2021-04-02
  • Contact: Bo Yang, Yaqin Wu, Saisai Lin, Lin Zhang
  • Supported by:
    The work was supported by National Key Research and Development Program of China (2016YFB0600503, 2016YFC0400503, 2016YFC0400506).

摘要: Homogeneous NaBH4-reduced Co3O4 thin film electrodes with enhanced oxygen evolution electrocatalysis were obtained via a controlled-synthesis route. Firstly CoOx colloids were synthesized via ethylene glycol solvothermal method and cast on conductive glass substrates. The oxygen evolution reaction (OER) electrocatalysis of these as-prepared Co3O4 thin films were then significantly enhanced via a simple surface reduction by NaBH4 solution. The OER catalytic performance of the NaBH4-reduced thin films was strongly dependent on the NaBH4 concentration. The use of NaBH4-reduced thin film electrodes for OER in alkaline solution supported higher current density and consequently negative shifts of the onset potential compared to that of the pristine. The optimal B12.5, 20-Co3O4 thin films exhibited excellent OER catalytic performances: At the current density of 10 mA·cm-2, a low overpotential of 365 mV and a small Tafel slope of 59.0 mV·dec-1 were observed. In addition, these B12.5, 20-Co3O4 thin film electrodes possessed good stability that can well recover its OER performance in a 24-h chronoamperometric stability test.

关键词: Co3O4 thin film, NaBH4 reduction, Electrolysis, Oxygen evolution reaction, Stability

Abstract: Homogeneous NaBH4-reduced Co3O4 thin film electrodes with enhanced oxygen evolution electrocatalysis were obtained via a controlled-synthesis route. Firstly CoOx colloids were synthesized via ethylene glycol solvothermal method and cast on conductive glass substrates. The oxygen evolution reaction (OER) electrocatalysis of these as-prepared Co3O4 thin films were then significantly enhanced via a simple surface reduction by NaBH4 solution. The OER catalytic performance of the NaBH4-reduced thin films was strongly dependent on the NaBH4 concentration. The use of NaBH4-reduced thin film electrodes for OER in alkaline solution supported higher current density and consequently negative shifts of the onset potential compared to that of the pristine. The optimal B12.5, 20-Co3O4 thin films exhibited excellent OER catalytic performances: At the current density of 10 mA·cm-2, a low overpotential of 365 mV and a small Tafel slope of 59.0 mV·dec-1 were observed. In addition, these B12.5, 20-Co3O4 thin film electrodes possessed good stability that can well recover its OER performance in a 24-h chronoamperometric stability test.

Key words: Co3O4 thin film, NaBH4 reduction, Electrolysis, Oxygen evolution reaction, Stability