Fig. 4 The relationship between specific surface area and specific capacitance of different biochars (plants include willow catkins[62], straw[55], pine needles[68], cotton stalks[76], poplar[37], moringa stems[38]; agricultural products include rice[54], corn[67], tea leaves[39], starch[77], seeds[78], paddy[79]; industrial products include chitosan[80], cola[81], chitin[82], tires[83]; residues include hair[84], pig tails[85], waste newspapers[86], shrimp shells[87], crab shells[88], rice husks[89]; fungi and algae include algal microspheres[90], hexactinellids[91], black fungus[65], red algae[92], Saccharomyces cerevisiae[93], Bacillus[94])
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