Hierarchical porous carbon from hazardous waste oily sludge for all-solid-state flexible supercapacitor

[Display omitted] •We first utilize oily sludge to fabricate three-dimensional hierarchical porous carbon (HPC) material.•The as-fabricated HPC exhibits super-high surface area and rational pore size distribution.•Outstanding performance of the HPC is demonstrated in all-solid-state flexible superca...

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