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Updated: Sep 6, 2025

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Highly Porous Holey Carbon for High Areal Energy Density Solid-State Supercapacitor Application
Christine Young1, Hong-Ting Chen1, Sahn-Ze Guo1
1Functional Nanoporous Materials Laboratory, Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan.
Abstract:
Biomass materials are perceived as sustainable, carbon-rich precursors for the fabrication of carbon materials. In this study, we demonstrated the capacitance performance of biomass-derived carbon, produced by using golden shower tree seeds (GTs) as carbon precursors and potassium ferrate (K2FeO4) as the activation agent. The as-prepared porous carbon (GTPC) possessed an ultrahigh specific surface area (1915 m2 g-1) and abundant pores. They also exhibited superior electrochemical performance, owing to their well-constructed porous structure, high surface area, and optimized porous structure. Optimized activated carbon (GTPC-1) was used to assemble a symmetric solid-state supercapacitor device with poly(vinyl alcohol) (PVA)/H2SO4 as a solid-state gel electrolyte. The device exhibited a maximum areal energy density of 42.93 µWh cm-2 at a power density of 520 µW cm-2.
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