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材料导报  2022, Vol. 36 Issue (21): 21080112-7    https://doi.org/10.11896/cldb.21080112
  无机非金属及其复合材料 |
聚乙二醇分子刷接枝改性碳微球及其电化学性能
赵磊1,2, 彭元佑1, 李媛1, 张倩倩1, 冉奋1,*
1 兰州理工大学材料科学与工程学院,省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050
2 陇东学院机械工程学院,甘肃 庆阳 745000
Modifying Carbon Microspheres by Grafting Polyethylene Glycol Molecular Brushes and Its Electrochemical Performance
ZHAO Lei1,2, PENG Yuanyou1, LI Yuan1, ZHANG Qianqian1, RAN Fen1,*
1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2 School of Mechanical Engineering, Longdong University, Qingyang 745000, Gansu, China
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摘要 碳材料是水系电化学电容器最重要的电极材料之一,但是它的本征非极性表面被极性的水系电解质浸润一直存在挑战。本工作采用聚合物接枝法将具有良好亲水性的聚乙二醇(PEG)分子刷接枝在碳微球的表面,可改善碳微球作为电极材料对水系电解质的浸润性。通过电极材料在6 mol/L KOH电解质中的分散性和静态水接触角测试表明,PEG分子刷改性的碳微球(P-Csa)电极材料展现更良好的水系电解质浸润性。循环伏安、恒流充放电法和交流阻抗等电化学测试显示,在电流密度为0.625 A/g 时,P-Csa电极材料的比容量比未改性碳微球电极材料提高了60%;该电极材料展现出良好的倍率性能、低的本征阻抗(0.94 Ω)和高的循环稳定性(在1.25 A/g电流密度下,10 000次循环后保持初始比容量的73.29%)。值得指出的是,PEG分子刷改性碳微球电极材料并未引入法拉第赝电容,主要改善电极材料表面的水系电解质浸润性。
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赵磊
彭元佑
李媛
张倩倩
冉奋
关键词:  碳微球  分子刷  聚乙二醇  聚合物接枝  电极材料    
Abstract: Carbon material is one of the most important electrode materials of electrochemical capacitor; however, it is always a challenge for carbon materials to be wetted by aqueous electrolyte with polarity, due to the intrinsic non-polarity of carbon materials surface. Herein, polyethylene glycol (PEG) molecular brushes with excellent hydrophilicity were grafted on carbon microspheres (Csa) surface through polymer grafting to improve the wettability of the Csa as electrode active materials toward aqueous electrolyte. The dispersibility test of electrode materials in 6 mol/L KOH electrolyte and static water contact angels showed that the PEG molecular brushes modified Csa (P-Csa) was better to be wetted by aqueous electrolyte than the unmodified Csa. Electrochemical tests, such as cyclic voltammograms, galvanostatic charge-discharge, electrochemical impedance spectroscopy, demonstrated that the specific capacity of P-Csa electrode material was nearly 60% higher than that of unmodified Csa electrode material at current density of 0.625 A/g, and the P-Csa electrode material also exhibited excellent rate performance, low intrinsic impedance (0.94 Ω) and high cycle stability (73.29% of the initial specific capacity after 10 000 cycles at current density of 1.25 A/g). It is worth pointing out that the modification of PEG molecular brushes for Csa electrode material does not introduce faradic pseudocapacitance, which mainly improves the wettability of electrode materials surface toward aqueous electrolyte.
Key words:  carbon microspheres    molecular brush    polyethylene glycol    polymer grafting    electrode material
出版日期:  2022-11-10      发布日期:  2022-11-03
ZTFLH:  TB324  
  TQ316.3  
基金资助: 国家自然科学基金(51763014;52073133);兰州理工大学红柳杰出青年学者项目;甘肃省青年科技基金计划(20JR10RA137)
作者简介:  赵磊,博士研究生,2010年7月本科毕业于泰山学院高分子材料与工程专业,2013年7月硕士毕业于兰州理工大学材料加工工程专业,师承冉奋教授,主要从事超级电容器电极材料的研究。
冉奋,教授/博士研究生导师, 甘肃省"飞天学者"青年学者。四川大学高分子材料工程国家重点实验室博士, 新加坡国立大学访问研究员、美国加州大学圣克鲁斯分校访问学者,美国加州大学圣芭芭拉分校学习双语教育教学法。担任中国生物材料学会血液净化材料分会委员,目前就职于省部共建有色金属先进加工与再利用国家重点实验室,研究方向包括活性可控聚合和大分子设计、新型能源材料和生物医用高分子材料。主编或编写专著4部,公开发表学术论文100余篇。
引用本文:    
赵磊, 彭元佑, 李媛, 张倩倩, 冉奋. 聚乙二醇分子刷接枝改性碳微球及其电化学性能[J]. 材料导报, 2022, 36(21): 21080112-7.
ZHAO Lei, PENG Yuanyou, LI Yuan, ZHANG Qianqian, RAN Fen. Modifying Carbon Microspheres by Grafting Polyethylene Glycol Molecular Brushes and Its Electrochemical Performance. Materials Reports, 2022, 36(21): 21080112-7.
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http://www.mater-rep.com/CN/10.11896/cldb.21080112  或          http://www.mater-rep.com/CN/Y2022/V36/I21/21080112
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