超纯煤沥青基活性炭的制备及其电化学性能的研究
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摘要
以中温煤沥青为原料,采用酸溶液脱灰以及氢氧化钾活化工艺制备了超纯煤沥青基活性炭,系统研究了活化温度对样品的微观形貌、孔结构以及电化学性能的影响。结果表明,随着活化温度的提高,样品的孔结构变得发达,孔径分布变宽;总比表面积和总孔体积先增加后又略微减小,中孔比表面积和中孔体积逐渐增大,在0.2A/g电流密度下比容量高达300F/g,10A/g电流密度时仍保持为174F/g,5A/g电流密度下充放电循环5000次以后,其比容量保持率高达98%,表明样品具有良好的倍率特性和循环稳定性能。
Ultra pure coal pitch based activated carbons were prepared by acid pickling of medium temperature coal tar pitch and KOH activation.The effects of activation temperature on the micro-morphology,pore structure and electrochemical performance of supercapacitors were systematically studied.The results indicated that with the increasing of activation temperature,the pore structure of samples was developed,and the pore size distribution was widened.However,the total specific surface area and total pore volume were increased firstly at 750℃and decreased at850℃.The specific surface area and pore volume of mesopores were increased gradually.The specific capacitance of activated carbons prepared at 650℃ was 300 F·g-1 at current density of 0.2 A·g-1,and still maintains 174 F·g-1 at10 A·g-1.Besides,after 5000 charging and discharging cycles at 5 A·g-1,the specific capacitance retention was 98%,indicating the good rate performance and cycling stability.
Ultra pure coal pitch based activated carbons were prepared by acid pickling of medium temperature coal tar pitch and KOH activation.The effects of activation temperature on the micro-morphology,pore structure and electrochemical performance of supercapacitors were systematically studied.The results indicated that with the increasing of activation temperature,the pore structure of samples was developed,and the pore size distribution was widened.However,the total specific surface area and total pore volume were increased firstly at 750℃and decreased at850℃.The specific surface area and pore volume of mesopores were increased gradually.The specific capacitance of activated carbons prepared at 650℃ was 300 F·g-1 at current density of 0.2 A·g-1,and still maintains 174 F·g-1 at10 A·g-1.Besides,after 5000 charging and discharging cycles at 5 A·g-1,the specific capacitance retention was 98%,indicating the good rate performance and cycling stability.
引文
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[2]Yan J,Wang Q,Wei T,et al.Recent advances in design and fabrication of electrochemical supercapacitors with high energy densities[J].Adv Energy Mater,2014,4(4):1-43.
[3]Lei Z B,Zhang J T,Zhang L L,et al.Funtionalization of chemically derived graphenefor improving its electrocapacitive energystorage properties[J].Energy Environ Sci,2016,9(6):1891-1930.
[4]Li B,Dai F,Xiao Q F,et al.Nitrogen-doped activated carbon for a highenergy hybrid supercapacitor[J].Energy Environ Sci,2016,9(1):102-106.
[5]Zhao Y,Hu L F,Zhao S Y,et al.Preparation of MnCo2O4@Ni(OH)2core-shell flowers for asymmetric supercapacitor materials with ultrahigh specific capacitance[J].Adv Funct Mater,2016,26(23):4085-4093.
[6]Alabadi A,Razzaque S,Dong Z H,et al.Graphene oxide-polythiophene derivative hybrid nanosheet for enhancing performance of supercapacitor[J].J Power Sources,2016,306:241-247.
[7]Chen J Z,Xu J L,Zhou S,et al.Nitrogen-doped hierarchically porous carbon foam:a free-standingelectrode and mechanical support for high-performancesupercapacitors[J].Nano Energy,2016,25:193-202.
[8]骆仲泱,王少鹏,方梦祥,等.煤焦油沥青的深度利用及发展前景[J].化工进展,2016,35(2):611-616.
[9]肖南,邱介山.煤沥青基功能碳材料的研究现状及前景[J].化工进展,2016,35(6):1804-1811.
[10]Ania C O,Khomenko V,Raymundo-Pi1ero E,et al.The large electrochemical capacitance of microporous doped carbon obtained by using a zeolite template[J].AdvFunct Mater,2007,17(11):1828-1836.
[11]Si W,Zhou J,Zhang S,et al.Tunable N-doped or dual N,S-doped activated hydrothermal carbons derived from human hair and glucose for supercapacitor applications[J].Electrochim Acta,2013,107(0):397-405.
[12]Wang Q,Cao Q,Wang X,et al.A high-capacity carbon prepared from renewable chicken feather biopolymer for supercapacitors[J].J Power Sources,2013,225(0):101-107.
[13]Kim T,Jung G,Yoo S,et al.Activated graphene-based carbons as supercapacitor electrodes with macro-and mesopores[J].ACS Nano,2013,7(8):6899-6905.
[14]Hulicova-Jurcakova D,Seredych M,Lu G Q,et al.Combined effect of nitrogen-and oxygen-containing functional groups of microporous activated carbon on its electrochemical performance in supercapacitors[J].AdvFunct Mater,2009,19(3):438-447.
[15]Wang K,Zhao N,Lei S W,et al.Promising biomass-based activated carbons derived from willow catkins for high performance supercapacitors[J].Electrochim Acta,2015,166(0):1-11.
[16]Kim T,Jung G,Yoo S,et al.Activated grapheme-based carbons as supercapacitor electrodes with macro-and mesopores[J].ACS Nano 2013,7(8):6899-6905.
[17]Wang K,Song Y,Yan R,et al.High capacitive performance of hollow activated carbon fibers derived from willow catkins[J].Appl Surf Sci,2017,394:569-577.