In-situ template cooperated with urea to construct pectin-derived hierarchical porous carbon with optimized pore structure for supercapacitor

•The 3D hierarchically porous carbon were synthesized via in-situ template and KOH activation from pectin.•The activation temperature and the addition of urea can adjust the content of heteroatoms and the pore structure.•The in-situ hard template can adjust the micropore/mesopores ratio.•The high sp...

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