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<p>Hydrogen produced via electrocatalytic water splitting is recognized as an ideal clean energy technology. The efficiency is strongly dependent on the catalytic activity and stability of bifunctional electrocatalysts. In this work, we designed Co<sub>9</sub>S<sub>8</sub>/CoO/NC with the heterogeneous interfaces grown on carbon paper (CP) by two-step hydrothermal methods. The defects and microstructure of the Co<sub>9</sub>S<sub>8</sub>/CoO/NC on CP were modulated by varying the ratio of C<sub>2</sub>H<sub>5</sub>NS to CoCl<sub>2</sub> 6H<sub>2</sub>O. The optimized Co<sub>9</sub>S<sub>8</sub>/CoO/NC (4:3) catalyst exhibited good OER activity (E<sub>overpotential</sub> = 215&#xa0;mV at 20&#xa0;mA&#xa0;cm<sup>−2</sup> with the Tafel slope of 99.39&#xa0;mV dec<sup>−1</sup>) and comparable HER performance (E<sub>overpotential</sub> = 183&#xa0;mV at 20&#xa0;mA&#xa0;cm<sup>−2</sup> with the Tafel slope of 135.23&#xa0;mV dec<sup>−1</sup>). Its hierarchical structure provides abundant accessible active sites for absorbing intermediates during HER/OER processes. Furthermore, the incorporated nitrogen- doped carbon facilitates electron transfer from the active sites to carbon papers. S and N dopants modify the electron distribution around Co and increase defects density for constructing more active sites for electrochemical reaction in the Co<sub>9</sub>S<sub>8</sub>/CoO/NC(4:3)/CP. Consequently, the water splitting electrolyzer based on the Co<sub>9</sub>S<sub>8</sub>/CoO/NC/CP (4:3) catalyst requires only 1.62&#xa0;V to achieve a current density of 20&#xa0;mA&#xa0;cm<sup>−2</sup> with long-term stability for 24&#xa0;h.</p> Graphical abstract <p></p>

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Construction of Co9S8/CoO/NC/CP with heterogeneous interfaces to boost oxygen evolution for overall water splitting

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Xueying Li,
  • Kemin An,
  • Xin Cui,
  • Fenyan Duan,
  • Wenxiu Teng,
  • Mengjiang Hu,
  • Yuanyuan Dan,
  • Lizhuang Chen

摘要

Hydrogen produced via electrocatalytic water splitting is recognized as an ideal clean energy technology. The efficiency is strongly dependent on the catalytic activity and stability of bifunctional electrocatalysts. In this work, we designed Co9S8/CoO/NC with the heterogeneous interfaces grown on carbon paper (CP) by two-step hydrothermal methods. The defects and microstructure of the Co9S8/CoO/NC on CP were modulated by varying the ratio of C2H5NS to CoCl2 6H2O. The optimized Co9S8/CoO/NC (4:3) catalyst exhibited good OER activity (Eoverpotential = 215 mV at 20 mA cm−2 with the Tafel slope of 99.39 mV dec−1) and comparable HER performance (Eoverpotential = 183 mV at 20 mA cm−2 with the Tafel slope of 135.23 mV dec−1). Its hierarchical structure provides abundant accessible active sites for absorbing intermediates during HER/OER processes. Furthermore, the incorporated nitrogen- doped carbon facilitates electron transfer from the active sites to carbon papers. S and N dopants modify the electron distribution around Co and increase defects density for constructing more active sites for electrochemical reaction in the Co9S8/CoO/NC(4:3)/CP. Consequently, the water splitting electrolyzer based on the Co9S8/CoO/NC/CP (4:3) catalyst requires only 1.62 V to achieve a current density of 20 mA cm−2 with long-term stability for 24 h.

Graphical abstract