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Abstract <p>In this study, a high-performance binder-free NF@Ni/rGO-MnO<sub>2</sub> electrode for supercapacitors was fabricated using a multi-step electrodeposition process. The Ni/rGO interlayer, with a cumulus/cauliflower-like structure, was cathodic composite electrodeposited onto NF, followed by anodic deposition of MnO<sub>2</sub> with a three-dimensional granular morphology. This composite structure outperformed NF@MnO<sub>2</sub>, where MnO<sub>2</sub> was directly deposited onto the NF. Under optimal conditions, the NF@Ni/rGO-MnO<sub>2</sub> electrode achieved a specific capacitance of 890.4 F·g<sup>−1</sup> at 1&#xa0;mA·cm<sup>−2</sup> and retained 105.7% capacitance after 10,000 cycles, compared to 851.5 F·g<sup>−1</sup> and 65.6% retention for NF@MnO<sub>2</sub> after 2000 cycles. These improvements are attributed to reduced series resistance, enhanced conductivity, and increased active surface area of NF@Ni/rGO-MnO<sub>2</sub> electrode from the multi-step deposition process. The mechanism behind this process is explained, and the structure–performance relationship is elucidated through various characterization methods. The energy density of the assembled NF@Ni/rGO-MnO₂//NF supercapacitor device can reach 136.3 Wh·kg<sup>−1</sup> and the power density can reach 625 W·kg<sup>−1</sup>. This approach based on the Gugliemi model offers a promising strategy for developing high-performance supercapacitor electrode materials.</p> Graphical Abstract <p></p>

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Application of cathodic composite electrodeposition for binder-free novel NF@Ni/rGO-MnO2 electrode with Ni/rgo interlayer for high-performance supercapacitor

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Geping He,
  • Lang Jv,
  • Zhong Huang,
  • Huijun HuangFu,
  • Zeguo Fu,
  • Yuxia Qiao,
  • Zhilei Li,
  • Zhaohui Zhang,
  • Donghai Ding,
  • Zongmo Shi

摘要

Abstract

In this study, a high-performance binder-free NF@Ni/rGO-MnO2 electrode for supercapacitors was fabricated using a multi-step electrodeposition process. The Ni/rGO interlayer, with a cumulus/cauliflower-like structure, was cathodic composite electrodeposited onto NF, followed by anodic deposition of MnO2 with a three-dimensional granular morphology. This composite structure outperformed NF@MnO2, where MnO2 was directly deposited onto the NF. Under optimal conditions, the NF@Ni/rGO-MnO2 electrode achieved a specific capacitance of 890.4 F·g−1 at 1 mA·cm−2 and retained 105.7% capacitance after 10,000 cycles, compared to 851.5 F·g−1 and 65.6% retention for NF@MnO2 after 2000 cycles. These improvements are attributed to reduced series resistance, enhanced conductivity, and increased active surface area of NF@Ni/rGO-MnO2 electrode from the multi-step deposition process. The mechanism behind this process is explained, and the structure–performance relationship is elucidated through various characterization methods. The energy density of the assembled NF@Ni/rGO-MnO₂//NF supercapacitor device can reach 136.3 Wh·kg−1 and the power density can reach 625 W·kg−1. This approach based on the Gugliemi model offers a promising strategy for developing high-performance supercapacitor electrode materials.

Graphical Abstract