Scholarlink

Abstract <p>The development of flexible and high-performance energy storage devices is essential for next-generation portable electronics. In this work, flexible graphene (G)-based supercapacitors (SCs) were fabricated using electrodes based on a SiO<sub>2</sub>/NiO/V<sub>2</sub>O<sub>5</sub> (SiNi) composite, which were decorated with copper oxide (CuO) nanoparticles (NPs) via electrodeposition. The electrodeposition was carried out using a copper ion electrolyte prepared by sulfuric acid leaching of e-waste (printed circuit boards from cell phones). The G/SiNi-SC device, fabricated using G/SiNi-E electrodes and without electrodeposited CuO NPs, delivered a specific capacitance of 235.71&#xa0;F/g. The SC performance increased drastically after the electrodeposition of CuO NPs on the electrodes. In particular, the device assembled with G/SiNi-E electrodes and using an electrodeposition time of 3&#xa0;min (G/SiNi3-SC) exhibited the best performance, showing a maximum capacitance of 614.73&#xa0;F/g, representing an increase of 260.8% compared to the G/SiNi-SC device. Spectroscopic analyses (UV–Vis, Raman, and XPS) associated the improved electrochemical performance with the presence of oxygen vacancies and the coexistence of Ni<sup>2+</sup>, Cu<sup>2+</sup>, and V<sup>4+</sup>/V<sup>5+</sup> redox species. Moreover, the G/SiNi3-SC device retained 92% of its capacitance after 1000 charge–discharge cycles and 85% after 1000 bending cycles, demonstrating both electrochemical and mechanical stability. These results highlight a sustainable and efficient route for designing flexible SCs by combining metal-oxide composites with e-waste-derived CuO, offering promising applications in portable energy storage.</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

Electrodeposited CuO nanoparticles from e-waste to improve the performance of graphene/SiO2/NiO/V2O5-based supercapacitors

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月6日

查看全文
  • O. Gomez-Zavala,
  • L. A. Garcés-Patiño,
  • Y. Velazquez-Galvan,
  • M. Perez-Chavez,
  • P. Salas,
  • J. Oliva

摘要

Abstract

The development of flexible and high-performance energy storage devices is essential for next-generation portable electronics. In this work, flexible graphene (G)-based supercapacitors (SCs) were fabricated using electrodes based on a SiO2/NiO/V2O5 (SiNi) composite, which were decorated with copper oxide (CuO) nanoparticles (NPs) via electrodeposition. The electrodeposition was carried out using a copper ion electrolyte prepared by sulfuric acid leaching of e-waste (printed circuit boards from cell phones). The G/SiNi-SC device, fabricated using G/SiNi-E electrodes and without electrodeposited CuO NPs, delivered a specific capacitance of 235.71 F/g. The SC performance increased drastically after the electrodeposition of CuO NPs on the electrodes. In particular, the device assembled with G/SiNi-E electrodes and using an electrodeposition time of 3 min (G/SiNi3-SC) exhibited the best performance, showing a maximum capacitance of 614.73 F/g, representing an increase of 260.8% compared to the G/SiNi-SC device. Spectroscopic analyses (UV–Vis, Raman, and XPS) associated the improved electrochemical performance with the presence of oxygen vacancies and the coexistence of Ni2+, Cu2+, and V4+/V5+ redox species. Moreover, the G/SiNi3-SC device retained 92% of its capacitance after 1000 charge–discharge cycles and 85% after 1000 bending cycles, demonstrating both electrochemical and mechanical stability. These results highlight a sustainable and efficient route for designing flexible SCs by combining metal-oxide composites with e-waste-derived CuO, offering promising applications in portable energy storage.

Graphical abstract