Synergistic KOH/NaOH activation of waste papaya seed derived carbon: differential etching for hierarchical pore engineering and high-performance supercapacitors

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KOH/NaOH synergistic activation of waste papaya seeds yields micro-mesoporous carbon (2334.13 m 2 g −1 ), delivering a specific capacitance of 283 F g −1 (1 A g −1 ) and 99% capacitance retention (5000 cycles).