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Biomass-derived carbons with hierarchical porous structures are widely considered as one of the most promising electrodes for supercapacitor. In this work, we present a facile approach to synthesize hierarchical porous carbon materials from waste lentinus edodes. It exhibits that the duration of the hydrothermal treatment process strongly affects the pore size distribution of the prepared carbon materials. Many narrow pores are formed during the hydrothermal process; these preformed pores are vital for the formation of micropores and development of larger mesopores in the following molten salt activation process. The as-obtained HM-24, synthesized by hydrothermally treated for 24 h and subsequently activated in molten Na₂CO₃-K₂CO₃ for 1 h, possesses high specific surface area of 1144 m² g⁻¹ and developed hierarchical micro- and mesoporous structures. Moreover, oxygen- and nitrogen-containing …