Coal gasification fine ash(CGFA)is the product of incomplete coal gasification,showing the characteristics of high emissions and difficulties of treatment,which leads to the issues of the environmental pollution and resource waste.In order to further promote the sustainable and high-value utilization of CG-FA,CGFA was used as a carbon source to prepare activated carbon for electric double layer supercapaci-tors through low-temperature alkali fusion coupled KOH activation treatment.The physical and chemical properties and electrochemical properties of activated carbon samples at different KOH dosages were com-pared.Results show that,in the range of mass ratio of deashing carbon(RC)and KOH from 1∶1 to 1∶4,the disorder,specific surface area(SBET),total pore volume(Vtotai),and mesopore occupancy(Vmes/Vtotal)of the activated carbon samples show a gradual enhancement trend with the increase of KOH dosage.The specific capacitance of the activated carbon sample increase with aforementioned parameters.When m(RC)∶m(KOH)=1∶4,the activated carbon sample exhibited an SBET of 1 938.03 m2/g,Vtotal of 1.62 cm3/g,Vmes/Vtotal of 82.82％,mass specific capacitance of 215.56 F/g(current density is 1 A/g),and a rate performance of 88.66％(current density is 1-20 A/g).The energy density of the assembled symmet-ric supercapacitor is 7.23(W·h)/kg(corresponding to a power density of 300 W/kg),and its capacitance retention rate is 100.45％after 100 000 cycles.
关键词
煤气化细灰/煤基固体废弃物/双电层型超级电容器/活性炭/高值化利用
Key words
coal gasification fine ash/coal-based solid waste/supercapacitor/activated carbon/higher val-ue application
维普
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