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<p>Biomass carbon-based materials are promising candidates for supercapacitor (SC) electrodes due to their large availability, environmental friendliness and low cost. Thus, a facile and cost-effective solvothermal process was used to synthesize cobalt zinc oxide biomass carbon (ZnCo<sub>2</sub>O<sub>4</sub>@BC) and cobalt zinc oxide composites with biomass carbon and activated carbon (ZnCo<sub>2</sub>O<sub>4</sub>@BC@AC) composites derived from rice straw. The structural and morphological properties of the samples were analyzed using Raman spectroscopy, FTIR, XPS, SEM/EDS, and the results reveal the presence of carbon incorporated into the zinc cobalt oxide ZnCo<sub>2</sub>O<sub>4</sub> matrix. Thermogravimetric analysis was used to determine the thermal stability of the samples. The synthesized ZnCo<sub>2</sub>O<sub>4</sub>@BC@AC composite exhibits a good specific capacity of 47.2&#xa0;mA&#xa0;h·g<sup>−1</sup> at 0.5 A·g<sup>−1</sup> and a low equivalent series resistance (ESR) value of 0.2 Ω. It has a good coulombic efficiency of 99.7% and retains 94.4% of capacity retention at 10 A·g<sup>−1</sup> up to 5000 cycles.</p> Graphical abstract <p></p>

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Developing nanocomposite materials based on zinc cobaltite and activated carbon derived from rice straw extracts for supercapacitor electrode applications

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Badou Sarr,
  • Ndeye Maty Ndiaye,
  • Ibrahima Ngom,
  • Makha Ndao,
  • Caroline Rosemyya Kwawu,
  • Ahmed Subrati,
  • Eduart Gutierrez-Pineda,
  • Sergio E. Moya,
  • Balla Diop Ngom

摘要

Biomass carbon-based materials are promising candidates for supercapacitor (SC) electrodes due to their large availability, environmental friendliness and low cost. Thus, a facile and cost-effective solvothermal process was used to synthesize cobalt zinc oxide biomass carbon (ZnCo2O4@BC) and cobalt zinc oxide composites with biomass carbon and activated carbon (ZnCo2O4@BC@AC) composites derived from rice straw. The structural and morphological properties of the samples were analyzed using Raman spectroscopy, FTIR, XPS, SEM/EDS, and the results reveal the presence of carbon incorporated into the zinc cobalt oxide ZnCo2O4 matrix. Thermogravimetric analysis was used to determine the thermal stability of the samples. The synthesized ZnCo2O4@BC@AC composite exhibits a good specific capacity of 47.2 mA h·g−1 at 0.5 A·g−1 and a low equivalent series resistance (ESR) value of 0.2 Ω. It has a good coulombic efficiency of 99.7% and retains 94.4% of capacity retention at 10 A·g−1 up to 5000 cycles.

Graphical abstract