水稻秸秆与PVC共热解制备炭材料及其电化学性能OA

To achieve the efficient and synergistic resource utilization of biomass and waste plastics,a co-pyrolysis method of rice straw(RS)and polyvinyl chloride(PVC)was employed to prepare high-performance capacitor carbon materials(PR).This study investigated the reaction pathways of the co-pyrolysis process and the structure-performance relationship of PR.A Joule heating device was used for rapid co-pyrolysis experi-ments,where the pyrolysis temperature(t=500,600,700,800℃)and the material ratio(m(PVC):m(RS)=3:1,2:1,1:1,1:2,1:3)were adjusted to produce a series of porous PRs.The micro-morphology,graphiti-zation degree,and functional group characteristics of PR were characterized using thermogravimetry-derivative thermogravimetry(TG-DTG),scanning electron microscopy(SEM),Raman spectroscopy,and Fourier transform infrared spectroscopy(FTIR).The electrochemical double-layer capacitance storage performance and hydrogen evolution reaction(HER)performance were tested using a three-electrode system.The results indicated a significant positive synergistic effect in the RS and PVC co-pyrolysis system,where RS effectively lowered the initial decomposition temperature of PVC and enhanced the pyrolysis rate.As the temperature increased,the graphitization degree and defect density(ID/IG)of PR increased;however,when t>700℃,the pore structure of PR collapsed,hindering ion transport in the electrolyte.When t=600℃and m(PVC):m(RS)=1:3,the pyrolyzed PR exhibited a hierarchical porous structure and suitable defect structure(ID/IG≈2.0),dem-onstrating optimal electrochemical performance,with the electrochemically active surface area corresponding to the double-layer capacitance(Cdl)reaching its maximum value(1.318 5 μF/cm²)and exhibiting the lowest hydrogen evolution overpotential.The incorporation of RS not only constructed a developed ion transport chan-nel but also mitigated the adverse effects arising from the PVC pyrolysis process through the synergistic effect,providing a reference for the development of low-cost,high-performance carbon-based energy storage materi-als.