Corn stalk was used as carbon source (CS),pretreated by soaking in Na2CO3 solution and activated by KOH to prepare porous biomass carbon (CS-ACS).The component,structure,morphology and electrochemical performances were investigated.The researches revealed that CS-AC-3 had multi-channel structure and the specific surface area could reach 3299m2/g.In three-electrode system,its specific capacitance as single electrode was up to 272F/g and 220F/g in 6mol/L NaOH solution and 0.5mol/L Na2SO4 solution as the electrolytes at a current density of 1A/g,respectively,and its capacity retention was 89% and 80%,respectively,after 5000 cycles at a current density of 5A/g.The CS-AC-3//CS-AC-3 symmetric capacitor assembled with this material had a wide voltage window of 1.4V and good electrochemical performance in two-electrode system.As a renewable and promising carbon material,the CS-ACS had excellent prospects for practical application.
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基金资助
甘肃省河西走廊特色资源利用重点实验室面上项目(XY1809);国家级大学生创新创业训练计划项目(201910740008)
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