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Hierarchical heterostructures of MXene and mesoporous hollow carbon sphere for improved ion accessibility and rate performance

文献类型： 外文期刊

作者： Yang, Fangli 1 ; Lv, Ke 2 ; Zhao, Xu 2 ; Kong, Derui 2 ; Kong, Na 2 ; Luo, Zirong 2 ; Tao, Jinlong 2 ; Zhou, Ji 6 ; Razal, Joselito M. 7 ; Zhang, Jizhen 2 ;

作者机构： 1.Zhoukou Normal Univ, Sch Chem & Chem Engn, Zhoukou 466001, Peoples R China

2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Guangdong Prov Key Lab Nat Rubber Proc, Zhanjiang 524001, Peoples R China

3.Hubei Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Peoples R China

4.Hubei Univ, Key Lab Synth & Applicat Organ Funct Mol, Minist Educ, Wuhan 430062, Peoples R China

5.Hubei Univ, Coll Chem & Chem Engn, Wuhan 430062, Peoples R China

6.Deakin Univ, Ctr Sustainable Bioprod, Sch Life & Environm Sci, Geelong, Vic 3216, Australia

7.Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216, Australia

关键词： MXene; Mesoporous hollow carbon spheres; Porous films; Fast charging-discharging rate; Supercapacitors

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2024 年 494 卷

页码：

收录情况： SCI

摘要： The development of electrode materials with a hierarchically porous structure and good electrical connection is key to improving the charging-discharging rate and energy density of supercapacitors. However, the restacking issue of two-dimensional nanomaterials, such as MXene, seriously hinders the diffusion of electrolyte ions. Different from the extensively used sacrificing template method, a hierarchical heterostructure of electrically conducting mesoporous hollow carbon spheres (MHCS) and MXene composite electrode is designed and achieved through simple vacuum filtration without further template removing procedures. This direct preparation strategy not only effectively improves the specific surface area of the electrode but also enhances the abundant surface pores and good conductivity of MHCS, improving the penetration of the electrolyte solution and shortening the ion transport path, leading to a pronounced improvement in specific capacitance and rate performance of the electrodes. Additionally, the influence of sheath thickness of MHCSs on ion transfer rate is deeply discussed. The introduction of carbon nanotubes (CNTs) further improves conductivity and stability while maintaining good flexibility. Consequently, the MXene/MHCS/CNT film delivers a high specific capacitance (395F g(-1) at 2 mV s(-1)), outstanding rate performance (70.9 % at 1000 mV s(-1)), and excellent cycling stability (98.3 % capacity retention after 10,000 cycles). Furthermore, the assembled symmetric supercapacitor provides a maximum energy density of 14.48 Wh kg(-1). This work provides a quick and effective approach for constructing high performance 3D MXene architectures for fast ion transfer electrodes.

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