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Reduced graphene oxide derived from sugarcane bagasse via natural extract reduction as a conductive agent for supercapacitor electrodes
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DOI：10.1016/j.diamond.2026.114009.png)
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Abstract
En 中文
In this study, reduced graphene oxide (rGO) was synthesized from sugarcane bagasse (SB), to be used as conductive agent in supercapacitor electrodes with activated carbon (AC) as active material. SB was carbonized into biochar by dehydration reaction with concentrated sulfuric acid. Then biochar was converted into graphene oxide by improved Hummers' method. Finally, GO was reduced by pomegranate juice, which is rich in anthocyanin. The obtained rGO was combined with carbon black (CB) in various proportion and used as conductive agent. Electrochemical measurements show that electrode with rGO 3% mixed with CB 7% by weight shows the highest specific capacitance (CS) of 253 F/g, which is significantly higher than 130 F/g in electrode with only CB as conductive agent. In electrode with the highest CS, the lowest equivalent series resistance and charge transfer resistance were also observed, with capacitance retention of 83.4% after 10,000 cycles. Furthermore, smaller water contact angles were observed in electrodes with rGO, unlike those with only CB, confirming the hydrophilic property of the synthesized rGO and its contribution to the hydrophilicity of the electrodes. These suggest that the improved performance of EDLC is resulted from hydrophilicity of the electrode which increases area of physical contact between electrolyte and electrode surface. The results suggest the advantage of the rGO synthesis process from SB in this work, where the performance of rGO as conductive agent in AC-based electrodes which is comparable to graphite-based rGO can be achieved with biomass as starting material and without requirement for thermal process.
Keywords:
Reduced graphene oxide
Biomass
Dehydration
Supercapacitors
Conductive agent
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