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A Simple Route to Produce Highly Efficient Porous Carbons Recycled from Tea Waste for High-Performance Symmetric Supercapacitor Electrodes.

Xiaoxiao QuWeiwei KangChangwei LaiChuanxiang ZhangSuck Won Hong
Published in: Molecules (Basel, Switzerland) (2022)
High-performance porous carbons derived from tea waste were prepared by hydrothermal treatment, combined together with KOH activation. The heat-treatment-processed materials possess an abundant hierarchical structure, with a large specific surface of 2235 m 2 g -1 and wetting-complemental hydrophilicity for electrolytes. In a two-electrode system, the porous carbon electrodes' built-in supercapacitor exhibited a high specific capacitance of 256 F g -1 at 0.05 A g -1 , an excellent capacitance retention of 95.4% after 10,000 cycles, and a low leakage current of 0.014 mA. In our work, the collective results present that the precursor crafted from the tea waste can be a promising strategy to prepare valuable electrodes for high-performance supercapacitors, which offers a practical strategy to recycle biowastes into manufactured materials in energy storage applications.
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