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Article Navigation >  Green Energy&Environment  > 2020  >  5(4): 492-498
Haoxuan Zhang, Jingyu Wang, Qilin Cheng, Petr Saha, Hao Jiang. Highly surface electron-deficient Co9S8 nanoarrays for enhanced oxygen evolution. Green Energy&Environment, 2020, 5(4): 492-498. doi: 10.1016/j.gee.2020.07.010
Citation: Haoxuan Zhang, Jingyu Wang, Qilin Cheng, Petr Saha, Hao Jiang. Highly surface electron-deficient Co9S8 nanoarrays for enhanced oxygen evolution. Green Energy&Environment, 2020, 5(4): 492-498. doi: 10.1016/j.gee.2020.07.010
shu

Highly surface electron-deficient Co9S8 nanoarrays for enhanced oxygen evolution

doi: 10.1016/j.gee.2020.07.010
  • a.

    Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

  • b.

    Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida T. Bati 5678, Zlin, 760 01, Czech Republic

More Information
  • Corresponding author: E-mail address: chengql@ecust.edu.cn (Qilin Cheng); E-mail address: jianghao@ecust.edu.cn (Hao Jiang)
  • Received date 22 June 2020, Accepted date 15 July 2020, RevRecd date 07 July 2020, Available online 23 July 2020, Publish date 31 October 2020,
    Abstract
  • Tailoring valence electron delocalization of transition metal center is of importance to achieve highly-active electrocatalysts for oxygen evolution reaction (OER). Herein, we demonstrate a “poor sulfur” route to synthesize surface electron-deficient Co9S8 nanoarrays, where the binding energy (BE) of Co metal center is considerably higher than all reported Co9S8-based electrocatalysts. The resulting Co9S8 electrocatalysts only require the overpotentials (η) of 265 and 326 mV at 10 and 100 mA cm−2 with a low Tafel slope of 56 mV dec−1 and a 60 h-lasting stability in alkaline media. The OER kinetics are greatly expedited with a low reaction activation energy of 27.9 kJ mol−1 as well as abundant OOH∗ key intermediates (24%), thus exhibiting excellent catalytic performances. The surface electron-deficient engineering gives an available strategy to improve the catalytic activity of other advanced non-noble electrocatalysts.

     

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