With the rapid development of human society and science technology, traditional fossil energy cannot fully meet the growing needs of human beings. Biomass is becoming an excellent green and sustainable energy, using agricultural wastes as biomass raw materials has great prospects in the field of power generation. Meanwhile, supercapacitors have the characteristics of long service life, large storage capacity, high power density, and stable working performance. The combination of agricultural wastes and supercapacitors is expected to bring innovative solutions to the green and low-carbon development of energy conversion. Herein, discarded lotus shells were used as our biomass-based carbon source. The effects of different activation temperatures (600 oC, 700 oC, 800 oC) and KOH / biomass impregnation ratio (1:0.5, 1:1, 1:2, 1:3) on their surface physicochemical properties were studied. The optimum preparation conditions were selected by the electrochemical properties of carbon electrode materials. The results indicated that the carbon electrode prepared at 800 oC and the impregnation ratio of 1:1 showed better electrochemical performance, the specific surface area could reach 1079.5 m2/g, and the specific capacity was measured to be 95 F/g at a current density of 1 A/g in 6 mol/L KOH electrolyte. We hope this research can provide some experimental basis for the green and low-carbon development of supercapacitors.

Carbon materials for supercapacitors based on agricultural wastes

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