High-value utilization of kitchen waste derived hydrochar in energy storage regulated by circulating process water
Kitchen waste (KW) can be regarded not only as waste, but as a kind of resource, which is composed of a large amount of energetic and nutritional ingredients. KW derived hydrochar (KWHC) is the carbonaceous materials obtained through the hydrothermal carbonization (HTC) process. Further utilization of hydrochar can help to enhance the value of the whole disposal process, in the meantime, it can realize energy recycling and recovery. This study conducts research on the circulating process water (PW) (from one to three times) as the major parameter in the regulation of KWHC's properties in low (1.5 h) and high (9.0 h) carbonization degrees. Meanwhile, this work also discusses the utilization of KWHC used as the cathode material in Li-O₂ batteries in the energy storage field. The results suggested that increased the circulating cycles can promote the electrochemical stability of Li-O₂ batteries to some degree. Moreover, use of KWHC as the cathode catalyst produced by the circulating PW in 1.5 h showed a better electrochemical performance than in 9.0 h. And the best cycling performance of the cathode obtained in circulating PW₁ (1.5 h) was about 242 cycles. Finally, an eco-friendly pathway of “bio-waste to energy storage” through the high-value utilization of KWHC was proposed.
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