South African Journal of Chemical Engineering (Apr 2024)

Reduced graphene oxide/nano-silica (rGO/n-SiO2) nanocomposite for electrode materials of supercapacitor with a high cycling stability

  • Desinta Dwi Ristiana,
  • Murni Handayani,
  • Muhammad Aulia Anggoro,
  • Bambang Wisnu Widagdo,
  • Ellysa Angelina,
  • Hadi Sutanto,
  • Isa Anshori,
  • Eni Febriana,
  • Florentinus Firdiyono,
  • Eko Sulistiyono,
  • Agus Budi Prasetyo,
  • Lusiana,
  • I Nyoman Gede Putrayasa Astawa

Journal volume & issue
Vol. 48
pp. 130 – 137

Abstract

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In this study, a composite of reduced graphene oxide and nano-silica (rGO/n-SiO2) was synthesized via the hydrothermal method, which is a facile technique and green reduction method. Nano-size silica provided a high surface area and more surface-active sites to react, while the modification with rGO improved the silica potential for a supercapacitor electrode. The XRD and Raman results confirmed the success of rGO/n-SiO2 synthesis. The FESEM and TEM showed that the SiO2 nanoparticles are highly distributed on graphene sheets. The rGO/n-SiO2 offers a high energy density value of 23.2 W h kg−1 at a power density of 50.0 W kg−1. After 4000 cycles, the electrode revealed good stability with a high capacitance retention of 95.51%. The rGO/n-SiO2 yields a high specific capacitance of 166.9 F g−1, suggesting that it could be helpful for supercapacitor electrodes.

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