由于具有丰富的孔隙率,活性炭(AC)的密度较低,导致其用于超级电容器储能难以获得高体积性能(能量密度<10.0Wh/L)。报道了一种单宁酸填充/碳化大孔和介孔的策略来提高其密度。结果表明:后填充的AC结晶度变化不大,密度大幅提高(0.55g/cm3增至1.32g/cm3),用作超级电容器电极实现了优异的体积容量性能,包括高容量(249F/cm3),高倍率性能(65.8%)和高能量密度(17.2Wh/L,在1188W/L下)。填充后的AC性能优于原始活性炭(10.1Wh/L,在495W/L下)和一些最近报道的炭基超级电容器。
Due to the low density resulted from its rich porosity,activated carbon (AC) is difficult to achieve high-volumetric performance (energy density<10.0Wh/L) for supercapacitor energy storage.This article reported a strategy of filling/carbonizing macropores and mesopores with tannic acid to improve the density.The results showed that the crystallinity of the post-filled AC did not change much,and the density significantly increased (1.32g/cm3 vs 0.55g/cm3).As an electrode for supercapacitor,the post-filled AC achieved excellent volumetric capacity performance,including high capacity (249F/cm3),high rate performance (65.8%),and high energy density (17.2Wh/L@1188W/L).The performance for supercapacitor of the filled AC was superior to that of the original activated carbon (10.1Wh/L at 495W/L) and some recently reported carbon-based supercapacitors.
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基金资助
江苏省可见光催化材料工程研究中心开放课题项目(JECVCM202202);江苏省职业教育纳米新材料“双师型”名师工作室项目(20220813)
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