Scholarlink

<p>The development of high-performance supercapacitor electrodes relies on materials that combine high electrical conductivity, large accessible surface area, and stable redox behavior. In this study, rGO/MnO<sub>2</sub>/Zeolitic Imidazolate Framework-8 (ZIF-8) composite electrodes were fabricated on nickel foam through a sequential electrophoretic deposition (EPD) technique. Graphene oxide was synthesized via the Tour method, MnO<sub>2</sub> was obtained through a co-precipitation process followed by calcination, and ZIF-8 was subsequently deposited to construct a ternary hybrid structure. Raman spectroscopy confirmed the formation of β-MnO<sub>2</sub> and rGO, with an increased I<sub>D</sub>/I<sub>G</sub> ratio (1.81), indicating higher defect density favorable for electrochemical activity. FESEM–EDX analysis revealed a hierarchical architecture composed of rGO nanosheets supporting MnO<sub>2</sub> nanoparticles and ZIF-8 crystals with uniform elemental distribution, confirming successful composite integration. Electrochemical characterization in 0.5&#xa0;M Na<sub>2</sub>SO<sub>4</sub> demonstrated that rGO/MnO<sub>2</sub>/ZIF-8 electrode delivered the highest performance compared to pristine MnO<sub>2</sub> (17.19&#xa0;F g<sup>− 1</sup>) and ZIF-8 (11.83&#xa0;F g<sup>− 1</sup>), exhibiting a specific capacitance of 42.90&#xa0;F g<sup>− 1</sup> at 10 mV s<sup>− 1</sup> (CV) and 30.74&#xa0;F g<sup>− 1</sup> at 0.1&#xa0;A g<sup>− 1</sup> (GCD).The b-value analysis suggested a combined capacitive and diffusion-controlled mechanism, while EIS results indicated a markedly reduced charge-transfer resistance (Rct = 180.8 Ω), attributed to the conductive rGO network and the porous ZIF-8 framework. These synergistic effects enhanced electron transport, ion diffusion, and redox activity. Overall, the rGO/MnO<sub>2</sub>/ZIF-8 composite demonstrates improved electrochemical performance and structural stability, highlighting its potential as a promising electrode material for next-generation supercapacitors.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fabrication of ternary rGO/MnO2/ZIF 8 composite electrode through electrophoretic deposition method for supercapacitor application

  • 期刊论文

  • 发表日期：

    2026年5月22日

查看全文
  • Bintang Dwi Nur Rohmad,
  • Andri Hardiansyah,
  • Resetiana Dwi Desiati,
  • Khusnul Khotimah,
  • Angga Hermawan,
  • Łukasz Pawłowski,
  • Zubaidah Ningsih

摘要

The development of high-performance supercapacitor electrodes relies on materials that combine high electrical conductivity, large accessible surface area, and stable redox behavior. In this study, rGO/MnO2/Zeolitic Imidazolate Framework-8 (ZIF-8) composite electrodes were fabricated on nickel foam through a sequential electrophoretic deposition (EPD) technique. Graphene oxide was synthesized via the Tour method, MnO2 was obtained through a co-precipitation process followed by calcination, and ZIF-8 was subsequently deposited to construct a ternary hybrid structure. Raman spectroscopy confirmed the formation of β-MnO2 and rGO, with an increased ID/IG ratio (1.81), indicating higher defect density favorable for electrochemical activity. FESEM–EDX analysis revealed a hierarchical architecture composed of rGO nanosheets supporting MnO2 nanoparticles and ZIF-8 crystals with uniform elemental distribution, confirming successful composite integration. Electrochemical characterization in 0.5 M Na2SO4 demonstrated that rGO/MnO2/ZIF-8 electrode delivered the highest performance compared to pristine MnO2 (17.19 F g− 1) and ZIF-8 (11.83 F g− 1), exhibiting a specific capacitance of 42.90 F g− 1 at 10 mV s− 1 (CV) and 30.74 F g− 1 at 0.1 A g− 1 (GCD).The b-value analysis suggested a combined capacitive and diffusion-controlled mechanism, while EIS results indicated a markedly reduced charge-transfer resistance (Rct = 180.8 Ω), attributed to the conductive rGO network and the porous ZIF-8 framework. These synergistic effects enhanced electron transport, ion diffusion, and redox activity. Overall, the rGO/MnO2/ZIF-8 composite demonstrates improved electrochemical performance and structural stability, highlighting its potential as a promising electrode material for next-generation supercapacitors.

Graphical abstract