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<p>A three-dimensional nanoporous nickel foil (3D-NPF) is directly transformed from commercial nickel foil through a gaseous oxidation–reduction strategy. The as-prepared NPF is used as a self-supported electrode for supercapacitors. The inherent nanoporous architectures of 3D-NPF constructs a continuous conductive network, thereby facilitating efficient charge transport and mass transfer during the electrochemical reaction process. In a 1&#xa0;M KOH electrolyte at a scan rate of 2&#xa0;mV&#xa0;s⁻<sup>1</sup>, its areal specific capacitance reached 465&#xa0;mF&#xa0;cm⁻<sup>2</sup>, which is 46 times that of the untreated nickel foil (NF) electrode. Such a nanoporous structure is well-suited for the high-loading of MnO₂ active species. When it is employed as a current collector, a composite electrode was fabricated by electrochemical deposition of MnO<sub>2</sub> on the 3D-NPF surface (3D-NPF/MnO<sub>2</sub>). The optimal 3D-NPF/MnO<sub>2</sub> electrode exhibited a mass-specific capacitance of up to 1304&#xa0;F&#xa0;g⁻<sup>1</sup> at a scan rate of 2&#xa0;mV&#xa0;s⁻<sup>1</sup>, with a capacitance retention rate of 98% after 10,000 cycles. This performance significantly outperforms composite electrodes composed of NF and MnO<sub>2</sub>, as well as the majority of reported MnO<sub>2</sub>-based electrodes.</p>

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Three-dimensional nanoporous nickel foil derived from commercial nickel foil: self-supporting electrode and high-efficiency current collector for MnO2-based supercapacitors

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Pengyu Wang,
  • Yingshuang Guo,
  • Meng Wang,
  • Shenyang Jiang,
  • Guanghong Ao,
  • Guohai Lin

摘要

A three-dimensional nanoporous nickel foil (3D-NPF) is directly transformed from commercial nickel foil through a gaseous oxidation–reduction strategy. The as-prepared NPF is used as a self-supported electrode for supercapacitors. The inherent nanoporous architectures of 3D-NPF constructs a continuous conductive network, thereby facilitating efficient charge transport and mass transfer during the electrochemical reaction process. In a 1 M KOH electrolyte at a scan rate of 2 mV s⁻1, its areal specific capacitance reached 465 mF cm⁻2, which is 46 times that of the untreated nickel foil (NF) electrode. Such a nanoporous structure is well-suited for the high-loading of MnO₂ active species. When it is employed as a current collector, a composite electrode was fabricated by electrochemical deposition of MnO2 on the 3D-NPF surface (3D-NPF/MnO2). The optimal 3D-NPF/MnO2 electrode exhibited a mass-specific capacitance of up to 1304 F g⁻1 at a scan rate of 2 mV s⁻1, with a capacitance retention rate of 98% after 10,000 cycles. This performance significantly outperforms composite electrodes composed of NF and MnO2, as well as the majority of reported MnO2-based electrodes.