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<p>Graphene materials show great potential in the field of supercapacitors, but their tendency to agglomerate leads to a significant decrease in performance. Herein, manganese dioxide intercalated graphene oxide precursor was prepared using the modified Hummer method. During pyrolysis, manganese dioxide can not only act as a separator to prevent graphene aggregation but also undergo redox reactions with graphene to obtain oxygen-rich mesopore graphene (OMG). Benefiting from the mesoporous structure and abundant oxygen-containing functional groups, the OMG-600 electrode shows a specific capacitance of 248.67 F g<sup>−1</sup> at 0.5 A g<sup>−1</sup> and good electrochemical stability (92.25% capacitance retention after 10,000 cycles). Moreover, the assembled OMG-600//OMG-600 symmetric supercapacitor delivers an energy density of 17.69 Wh kg<sup>−1</sup> and superior electrochemical stabilization in 1&#xa0;M Na<sub>2</sub>SO<sub>4</sub> electrolyte.</p>

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Preparation of oxygen-enriched mesopore graphene for high performance supercapacitor

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Xinyang Zhang,
  • Congcong Zhang,
  • Jun Ni,
  • Xiaoliang Wu

摘要

Graphene materials show great potential in the field of supercapacitors, but their tendency to agglomerate leads to a significant decrease in performance. Herein, manganese dioxide intercalated graphene oxide precursor was prepared using the modified Hummer method. During pyrolysis, manganese dioxide can not only act as a separator to prevent graphene aggregation but also undergo redox reactions with graphene to obtain oxygen-rich mesopore graphene (OMG). Benefiting from the mesoporous structure and abundant oxygen-containing functional groups, the OMG-600 electrode shows a specific capacitance of 248.67 F g−1 at 0.5 A g−1 and good electrochemical stability (92.25% capacitance retention after 10,000 cycles). Moreover, the assembled OMG-600//OMG-600 symmetric supercapacitor delivers an energy density of 17.69 Wh kg−1 and superior electrochemical stabilization in 1 M Na2SO4 electrolyte.