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<p>A cost-effective and large-scale method for synthesizing ZnCo<sub>2</sub>O<sub>4</sub> nanoflowers with surface oxygen vacancies as electrode materials for supercapacitors is presented. The existence of oxygen vacancies on the surface of the ZnCo<sub>2</sub>O<sub>4</sub> nanoflowers has been confirmed through X-ray photoelectron spectroscopy (XPS). The energy bands and density of states (DOS) of ZnCo<sub>2</sub>O<sub>4</sub> are examined using density functional theory, revealing that treatment with NaBH<sub>4</sub> reduces the band gap of ZnCo<sub>2</sub>O<sub>4</sub> while increasing the DOS near the Fermi level compared to pristine ZnCo<sub>2</sub>O<sub>4</sub>. Furthermore, the specific capacitance of reduced ZnCo<sub>2</sub>O<sub>4</sub> is nearly double that of its unmodified counterpart. This straightforward and practical approach significantly enhances both conductivity and specific capacitance in metal oxides, making it applicable to other similar materials.</p>

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Formation of surfaces oxide vacancies in porous ZnCo2O4 nanoflowers for enhanced energy storage performance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月9日

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  • Deyang Zhang,
  • Binhe Feng,
  • Wenbo Guo,
  • Jinbing Cheng,
  • Kangwen Qiu,
  • Ying Guo

摘要

A cost-effective and large-scale method for synthesizing ZnCo2O4 nanoflowers with surface oxygen vacancies as electrode materials for supercapacitors is presented. The existence of oxygen vacancies on the surface of the ZnCo2O4 nanoflowers has been confirmed through X-ray photoelectron spectroscopy (XPS). The energy bands and density of states (DOS) of ZnCo2O4 are examined using density functional theory, revealing that treatment with NaBH4 reduces the band gap of ZnCo2O4 while increasing the DOS near the Fermi level compared to pristine ZnCo2O4. Furthermore, the specific capacitance of reduced ZnCo2O4 is nearly double that of its unmodified counterpart. This straightforward and practical approach significantly enhances both conductivity and specific capacitance in metal oxides, making it applicable to other similar materials.