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Hierarchically porous carbon (HPC) derived from fallen flowers was prepared by a green method of combining solvent‐free ball milling with the safe activating agent potassium bicarbonate. By regulating the mass ratio of KHCO3 to biochar, the as‐prepared HPC materials possess high specific surface areas of up to 2147.9 m2 g−1 and abundant hierarchical pores comprised of micro‐, meso‐, and macropores...
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