纳米木质素基多孔炭的制备及其电化学性能  

Preparation of LNP-based hierarchical porous carbon and its electrochemical properties

作　　者：娄瑞 刘钰 田杰 张亚男[2] LOU Rui;LIU Yu;TIAN Jie;ZHANG Yanan(College of Mechanical and Electrical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,Shaanxi,China;College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学机电工程学院,陕西西安710021 [2]陕西科技大学化学与化工学院,陕西西安710021

出　　处：《化工进展》2022年第6期3170-3177,共8页Chemical Industry and Engineering Progress

基　　金：陕西省重点研发计划(2021SF-502);陕西高校青年创新团队计划(2019)。

摘　　要：基于绿色低共熔溶剂(DES)高效分离麦草生物质组分以制备纳米木质素(LNP),本文采用化学活化法并进一步热解炭化制备纳米木质素基多孔炭(LNPC)。借助SEM、Raman、BET-物理吸附等分析手段研究了锌系活化剂及热解炭化温度(600℃、700℃、800℃)对LNPC的结构特征及电化学性能的影响。研究结果表明,相对于LNP直接热解炭化后纳米碳粒子的极易团聚,经锌化物活化后所制备的LNPC表现出更好的分散性和多级孔道形貌结构。尤其,以ZnCO_(3)活化后制备的LNPC-ZnCO_(3)-800具有更突出的性能,较高石墨化程度(I_(D)/I_(G)为0.68)、较高BET比表面积(679m^(2)/g)、高介孔率(86.7%)、均匀纳米碳粒子构成的介孔结构。此外,以LNPCZnCO_(3)-800制备的工作电极,在0.5A/g时的比电容可达179F/g,与直接热解炭化的LNPC-800(64F/g)相比,其比电容的容量提高了180%。Based on green deep eutectic solvent(DES),wheat straw biomass fractionations were efficiently isolated to prepare lignin nanoparticles(LNP).LNP-based carbon(LNPC)with hierarchical porous microstructure was prepared by chemical activation and further pyrolysis and carbonization.The influences of Zn-activators and pyrolysis temperatures(600℃,700℃,800℃)on the structural properties and electrochemical performances of LNPC were studied by means of SEM,Raman,BET analyzers,etc.The results proved that the activated LNPC with Zn-activators exhibited better dispersibility and more hierarchical porous morphology compared with LNPC from direct pyrolysis consisted of massive carbon nanoparticles aggregation.In particular,LNPC-ZnCO_(3)-800 possessed outstanding performances on better graphitization(I_(D)/I_(G)=0.68),higher BET specific surface area(679m^(2)/g),more mesoporous pores(86.7%)and uniform carbon nanoparticles.Moreover,LNPC-ZnCO_(3)-800 had a high specific capacitance of 179F/g at a current density of 0.5A/g,which was 180%higher than that of LNPC-800(64F/g).

关 键 词：纳米木质素 活化 热解 多孔炭 电化学 

分 类 号：TK6[动力工程及工程热物理—生物能]