摘要
利用稻壳热解炭为原料制备镧负载多孔炭复合电极材料(La/PCs),先将稻壳热解炭分离出炭前驱体,再采用原位活化/负载的方法制备一系列镧负载多孔炭复合电极材料,分别考察了煅烧温度和浸渍比对其吸附性能和电化学性能的影响.采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜/X射线能谱仪(SEM-EDS)和Brunauer-Emmett-Teller比表面积(BET)法研究了该系列镧负载多孔炭复合电极材料的金属结构与价态、元素组成及表面形貌,并分析了孔结构与电容值之间可能存在的关系.结果表明,在6 mol/L KOH电解液中,La/PC_900/10材料的电容值为269.45 F/g.在电流密度为0.5 A/g时,由其组装的对称超级电容器具有23.45 W·h/kg的能量密度,此时的功率密度为0.70 kW/kg,并且循环5000次后的电容保持率为86.41%.La/PC_900/10良好的电容性能显示了其作为碳基电极应用于高性能超级电容器的潜力.研究结果为稻壳热解炭的利用和镧在新能源材料领域的应用提供了一条可行路径.
In this paper,a high value-added utilization method of rice husk char was proposed to prepare lanthanumsupported porous carbon composite electrode materials(La/PCs).A series of La/PCs were prepared via in situ activation/loading method.The effects of calcination temperature and impregnation ratio on the adsorption and electro⁃chemical properties of La/PCs were investigated.X-Ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscope-energy dispersive spectrometer(SEM-EDS)and Brunauer-Emmett-Teller surface area(BET)were used to study the metal structure,valence state,element compositions and surface morphology of those La/PCs.It was analyzed that the possible relationship between pore structure and capacitance value.As a result,the La/PC_900/10 exhibited high gravimetric capacitance of 269.45 F/g in 6 mol/L KOH electrolyte.At 0.5 A/g,the assembled symmetric supercapacitor presented a superior gravimetric energy density of 23.45 W·h/kg at 0.70 kW/kg and the capacitance retention rate was 86.41%after 5000 cycles.The favorable capacitive behavior of La/PC_900/10 demonstrated its potential as carbon-based electrode applied in high performance supercapacitors.This paper provides a feasible path for the utilization of rice husk char and the application of lanthanum in the field of new energy materials.
作者
隋光辉
程岩岩
SUI Guanghui;CHENG Yanyan(Department of Chemistry and Food Science,Nanchang Normal University,Nanchang 330032,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第4期1-9,共9页
Chemical Journal of Chinese Universities
基金
南昌师范学院博士科研启动基金(批准号:NSBSJJ2019003,NSBSJJ2019005),南昌师范学院校级科技项目(批准号:23XJZR02)资助。
关键词
稻壳热解炭
镧负载多孔炭
复合电极
Rice husk char
Lanthanum-supported porous carbon
Composite electrode
