“…Therefore, it is important to study new ways of replacing these high-cost and complex materials for cheaper and sustainable ones [ 2 , 3 , 12 , 13 , 14 ]. Extensive research is being conducted to develop innovative concepts using biomass materials as precursors to develop biochar-based materials employed as electrodes for SC [ 2 , 3 , 14 ]. Biochars can be made from any biomass and have an adaptable structure that, through different pre-treatments, can be modified to reach a high SSA, even higher than 3300 m 2 g −1 [ 12 ], well-developed porosity with varying pore sizes, and more oxygen and nitrogen surface functional groups on its surfaces, making them very suitable to be used as electrodes for SCs [ 3 , 15 , 16 ].…”