高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (7): 20240099.doi: 10.7503/cjcu20240099

• 物理化学 • 上一篇    下一篇

三维氮掺杂分级多孔碳纳米片的制备及储锌性能

何军1, 朱傲阳1, 魏雨晨1, 朱怡全1, 蒋莉2, 何孝军1()   

  1. 1.安徽工业大学化学与化工学院, 煤清洁转化与高值化利用安徽省重点实验室
    2.继续教育学院, 马鞍山 243002
  • 收稿日期:2024-02-28 出版日期:2024-07-10 发布日期:2024-05-06
  • 通讯作者: 何孝军 E-mail:xjhe@ahut.edu.cn
  • 基金资助:
    国家自然科学基金(52372037);安徽省高等学校优秀科研创新团队项目(2023AH010015)

Preparation and Zinc Storage Properties of Three-dimensional Nitrogen-doped Hierarchical Porous Carbon Nanosheets

HE Jun1, ZHU Aoyang1, WEI Yuchen1, ZHU Yiquan1, JIANG Li2, HE Xiaojun1()   

  1. 1.School of Chemistry and Chemical Engineering,Anhui Key Laboratory of Coal Clean Conversion and High Valued Utilization
    2.College of Continuing Education,Anhui University of Technology,Maanshan 243002,China
  • Received:2024-02-28 Online:2024-07-10 Published:2024-05-06
  • Contact: HE Xiaojun E-mail:xjhe@ahut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52372037);the Outstanding Scientific Research and Innovation Team Program of Higher Education Institutions of Anhui Province, China(2023AH010015)

摘要:

以MgO@ZIF-8为双模板和辅助碳源, KHCO3为活化剂, 煤沥青(CTP)为碳源, 制备了三维氮掺杂分级多孔碳纳米片(N-CNs), 探究了KHCO3与CTP的质量比对N-CNs的结构、 化学组成和锌离子储存性能的影响. 结果表明, 当KHCO3与CTP的质量比为3∶1时, 制备的样品(N-CN3)具有三维互连的碳纳米片结构、 高比表面积(2360 m2/g)和吡咯氮含量. 将N-CN3作为锌离子混合电容器(ZHCs)正极时, 其在2 mol/L ZnSO4电解液中展现了出色的比容量(当电流密度为0.2 A/g时, 比容量为157.6 mA·h/g)、 高的能量密度(在176.1 W/kg功率密度下能量密度为126.5 W·h/kg)和优异的循环稳定性(当电流密度为5 A/g时, 经过20000次循环后容量仅衰减6.4%, 库仑效率为99.6%). 密度泛函理论计算结果证实, 吡咯氮掺杂增加了电极材料对锌离子的吸附能, 提高了N-CNs对锌离子的吸附容量.

关键词: 锌离子混合电容器, 煤沥青, 多孔碳, MgO@ZIF-8, 密度泛函理论计算

Abstract:

In this work, three-dimensional nitrogen-doped hierarchical porous carbon nanosheets(N-CNs) were synthesized from coal tar pitch(CTP) by using MgO@ZIF-8 as double template and auxiliary carbon source coupled with KHCO3in situ activation. The effects of the mass ratio of KHCO3 to CTP on the structure, chemical composition and zinc ion storage properties of N-CNs were investigated. The as-prepared N-CN3 at a mass ratio of 3∶1 of KHCO3 to CTP features a three-dimensional interconnected carbon nanosheet structure, high specific surface area(2360 m2/g) and pyrrole nitrogen content. Benefiting from the above characteristics, the N-CN3 cathode of zinc-ion hybrid capacitor(ZHCs) in 2 mol/L ZnSO4 exhibits excellent specific capacity(157.6 mA·h/g at 0.2 A/g), high energy density(126.5 W·h/kg at 176.1 W/kg) and exceptional cycle stability (only 6.4% capacity decay after 20000 cycles at 5 A/g and 100% Coulomb efficiency). The density functional theory(DFT) calculation results verified the enhancement of the adsorption energy to Zn2+ due to the presence of pyrrole nitrogen in N-CNs, thus leading to enhanced adsorption capacity of N-CNs to zinc ions. This work prides an efficient method for the high-added value utilization of coal chemical by-products.

Key words: Zinc-ion hybrid capacitors(ZHCs), Coal tar pitch(CTP), Porous carbon, MgO@ZIF-8, Density functional theory calculation

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