Chemical Industry and Engineering Progress ›› 2024, Vol. 43 ›› Issue (2): 1013-1021.DOI: 10.16085/j.issn.1000-6613.2023-0295

• Materials science and technology • Previous Articles    

Preparation and electrochemical performances of in-situ growth of δ-MnO2 on hierarchical porous carbon derived from LNP

LOU Rui1(), NIU Taoyuan1, CAO Qihang1, ZHANG Yiyi1, LEI Wenqi1, LU Congmin1, WANG Zhiwei2   

  1. 1.College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, Shaanxi, China
    2.Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
  • Received:2023-02-28 Revised:2023-03-20 Online:2024-03-07 Published:2024-02-25
  • Contact: LOU Rui

δ-MnO2原位负载纳米木质素基分级多孔炭的制备及其电化学性能

娄瑞1(), 牛涛嫄1, 曹启航1, 张依依1, 雷雯祺1, 卢聪敏1, 王志伟2   

  1. 1.陕西科技大学机电工程学院,陕西 西安 710021
    2.广西大学轻工与食品工程学院,广西清洁化制浆造纸与污染控制重点实验室,广西 南宁 530004
  • 通讯作者: 娄瑞
  • 作者简介:娄瑞(1983—),女,副教授,硕士生导师,研究方向为生物质高效转化利用。E-mail:lourui@sust.edu.cn
  • 基金资助:
    陕西省重点研发计划(2021SF-502);广西清洁化制浆造纸与污染控制重点实验室开放基金(2021KF35)

Abstract:

Lignin based porous carbon have been widely studied as the electrode materials for supercapacitors device owing to its low-cost, renewable and simple preparation process. In this paper, lignin nanoparticles (LNP) isolated from wheat straw biomass was used as the carbon precursor, pretreated by activation with ZnCO3, and then prepared to LNP based hierarchical porous carbon (LPC) through slow pyrolysis at different temperatures (600—800℃). Furthermore, in-situ growth of δ-MnO2 was loaded onto the surfaces of LPC by the lights of solution reaction method. The resultant MnO2/LPC nanocomposite with three-dimensional (3D) nano-lamellar structure was successfully synthesized. The micromorphology, chemical composition, and electrochemical performances of MnO2/LPC were characterized by means of SEM, XRD, FTIR and electrochemical tests. The study results suggested that the behaviors of MnO2in-situ growing on LPC were significantly affected by the pyrolysis temperature of LPC preparation. As the pyrolysis temperature of LPC increased from 600℃ to 800℃, the pattern of δ-MnO2 nanocrystals evolved from the clustered particles to 3D cross-linked porous lamellar nanostructure. In addition, the as-prepared MnO2/LPC electrode had shown excellent electrochemical performances. The specific capacitance of MnO2/LPC at 800℃ could reach 145F/g at 1A/g, yet maintained 110F/g as the current density increasing to 5A/g, indicating that it had also a better rate performance (75.9%). Meanwhile, the symmetric supercapacitor assembled from this composite material had a high specific capacitance of 87F/g and energy density of 3.03W·h/kg in the two electrode system.

Key words: lignin nanoparticles, porous carbon, manganese dioxide(MnO2), electrochemical

摘要:

由于生物质具有来源广泛、成本低廉、可再生等优点,近年来生物质基多孔炭作为电极材料在超级电容器方面的应用被广泛研究。本文以麦草生物质分离得到的纳米木质素(lignin nanoparticles, LNP)为炭前体,经碳酸锌活化预处理后在不同热解温度(600~800℃)下制备LNP基分级多孔炭(LPC)。并通过溶液反应法将δ-MnO2纳米晶原位负载于LPC上,成功合成具有三维(3D)纳米片状结构的炭基复合材料(MnO2/LPC)。借助扫描电子显微镜、X射线衍射仪和傅里叶变换红外光谱仪等手段耦合电化学性能测试技术,对MnO2/LPC的微观形貌、结构组成及电化学性能等进行表征。研究结果显示,LNP衍生LPC的热解温度对δ-MnO2原位生长行为有着重要影响。当LPC的热解温度从600℃升高到800℃时,原位生长的MnO2从纳米簇状颗粒逐渐演变成3D交联的多孔纳米片层结构。此外,以MnO2/LPC制备的工作电极表现出优异的电化学性能。当电流密度为1A/g时,在800℃下的MnO2/LPC具有最高的质量比电容(145F/g);当电流密度增大至5A/g时,其比电容量仍保持为110F/g,并具有良好的倍率性能(75.9%);同时,该复合材料组装成的对称超级电容器在二电极体系下具有较高的比电容(87F/g)和能量密度(3.03W·h/kg)。

关键词: 纳米木质素, 多孔炭, 二氧化锰, 电化学

CLC Number: 

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