Composting leachate, a potential precursor, was attempted to prepare the activated carbons via hydrothermal carbonization plus KOH activation in this work. The obtained carbons were further investigated to check their electrochemical performances as electrode materials of supercapacitor. The carbon material that activated at 700 °C (CL-700) exhibits the highest specific surface area of 2184.9 m² g⁻¹ and the largest pore volume of 1.55 cm³ g⁻¹ comparing to the activated carbons at other temperatures. In a three-electrode system, CL-700 displayed an excellent capacitance of 228 F g⁻¹ at 0. 5 A g⁻¹, and it was 178 F g⁻¹ even though at a higher current density of 10 A g⁻¹. After 5000 tests on the charge-discharge cycle, CL-700 showed a superior stability with 83.2% capacity retention and almost 100% coulombic efficiency at 5 A g⁻¹. Moreover, CL-700 had a good energy density of 7.1 Wh kg⁻¹ at a power density of 124.9 W kg⁻¹ in a symmetric two-electrode system. Based on the comparison with the currently reported biomass-deriver carbons, the composting leachate can be regarded as a feasible precursor to harvest carbon materials for supercapacitor electrode, which was meaningful to offer a novel path for the valorization of the leachate fraction from bio-wastes.

在这项工作中，试图通过堆热渗滤液（一种潜在的前体）通过水热碳化加KOH活化来制备活性炭。进一步研究了所得的碳，以检查其作为超级电容器电极材料的电化学性能。与其他温度下的活性炭相比，在700°C下活化的碳材料（CL-700）的最高比表面积为2184.9 m ²  g ^-1，最大孔体积为1.55 cm ³  g ^-1。在三电极系统中，CL-700 在0. 5 A g ^-1下显示出228 F g ^-1的出色电容，而在178 F g ^-1下显示即使在10 A g ^-1的较高电流密度下也是如此。经过5000次充放电循环测试，CL-700在5 A g ^-1下显示出优异的稳定性，容量保持率为83.2％，库伦效率几乎为100％。此外，CL-700有7.1瓦公斤的良好的能量密度^-1在124.9千克w ^的功率密度^-1在对称的两电极系统。根据与目前报道的生物质衍生碳的比较，堆肥渗滤液可被视为收集超级电容器电极用碳材料的可行前体，这对于为生物废物中的渗滤液馏分的增值提供一条新途径是有意义的。 。