高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (4): 20240012.doi: 10.7503/cjcu20240012

• 研究论文: 无机化学 • 上一篇    

以稻壳热解炭制备镧负载多孔炭复合电极材料

隋光辉(), 程岩岩   

  1. 南昌师范学院化学与食品科学学院, 南昌 330032
  • 收稿日期:2024-01-07 出版日期:2024-04-10 发布日期:2024-02-21
  • 通讯作者: 隋光辉 E-mail:ghsui@ncnu.edu.cn
  • 基金资助:
    南昌师范学院博士科研启动基金(NSBSJJ2019003);南昌师范学院校级科技项目(23XJZR02)

Lanthanum-supported Porous Carbon Composite Electrode Material Prepared by Rice Husk Char

SUI Guanghui(), CHENG Yanyan   

  1. Department of Chemistry and Food Science,Nanchang Normal University,Nanchang 330032,China
  • Received:2024-01-07 Online:2024-04-10 Published:2024-02-21
  • Contact: SUI Guanghui E-mail:ghsui@ncnu.edu.cn
  • Supported by:
    the Doctoral Research Start-up Funding of Nanchang Normal University, China(NSBSJJ2019003);the Science and Technology Project of Nanchang Normal University, China(23XJZR02)

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.

关键词: 稻壳热解炭, 镧负载多孔炭, 复合电极

Abstract:

In this paper, a high value-added utilization method of rice husk char was proposed to prepare lanthanum-supported 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 electrochemical 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.

Key words: Rice husk char, Lanthanum-supported porous carbon, Composite electrode

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