榴莲壳水热焦耦合MgAl-LDH复合焦特性及电化学性能  

CHARACTERISTICS AND ELECTROCHEMICAL PERFORMANCE OF COMPOSITE BIOCHAR OF DURIAN SHELL HYDROCHAR COUPLING WITH MgAl-LDH

作　　者：郭淑青 张恒瑞 谭文轶 陈祥 王红艳[1] 董向元 Guo Shuqing;Zhang Hengrui;Tan Wenyi;Chen Xiang;Wang Hongyan;Dong Xiangyuan(School of Energy and Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]南京工程学院能源与动力工程学院,南京211167

出　　处：《太阳能学报》2021年第8期483-487,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51206194);南京工程学院引进人才科研启动基金(YKJ201811,YKJ201812)。

摘　　要：为研究榴莲壳水热焦耦合层状双金属氢氧化物制备的复合焦作为电极材料的性能,以榴莲壳为碳源,经两步水热法将榴莲壳水热焦与MgAl-LDH复合,制备成MgAl-LDH@BC复合焦,分析其理化特性与电化学性能。结果表明,MgAl-LDH@BC焦表面以C、O元素为主,C、O原子百分比分别为56.04%和33.94%;复合焦呈层状多孔结构,平均孔径为15.44 nm,BET比表面积为75.51 m^(2)/g;在三电极系统中,6 mol/L KOH为电解质时,MgAl-LDH@BC作为工作电极的循环伏安曲线近似矩形且对称,不同电流密度下的恒电流充放电曲线近似为三角形,1 A/g时具有742.68 F/g的比电容,低频时交流阻抗曲线显示为陡斜线,作为超级电容器电极材料应用时,电容保持率和倍率性能较好。In order to explore the electrochemical performance of the composite materials, the biochar of MgAl-LDH@BC was prepared from durian shell hydrochar coupling with MgAl-LDH via hydrothermal treatment. The physicochemical characteristics and electrochemical properties of the composite biochar as electrode material were analyzed. The results show that the surface of the MgAlLDH@BC is mainly composed of C and O elements,and the percentage of C and O atoms is 56.04% and 33.94% respectively. The composite biochar presents layered porous structure. Moreover, the MgAl-LDH@BC exhibits a BET specific surface area of 75.51 m^(2)/g,an average pore size of 15.44 nm. In a three electrode system with 6 mol/L KOH as electrolyte, the cyclic voltammetry curve of the composite biochar prepared as working electrode is symmetrical rectangular. The galvanostatic charge-discharge curve under different current densities is approximately triangular. The specific capacitance of the hydrochar is 742.68 at 1 A/g. The electrochemical impedance curve shows a steep slope in the low frequency region. The MgAl-LDH@BC has good capacitance retention rate and chemical stability,and has the potential to become electrode materials of super capacitors.

关 键 词：生物质 水热碳化 超级电容器 水热焦 层状双金属氢氧化物 

分 类 号：TK6[动力工程及工程热物理—生物能]