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Understanding the Effect of Pore Size on Electrochemical Capacitive Performance of MXene Foams

文献类型： 外文期刊

作者： Lv, Ke 1 ; Zhang, Jizhen 4 ; Zhao, Xu 4 ; Kong, Na 4 ; Tao, Jinlong 4 ; Zhou, Ji 1 ;

作者机构： 1.Hubei Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Peoples R China

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

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

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

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

6.Mudanjiang Normal Univ, Coll Chem & Chem Engn, Mudanjiang 157011, Peoples R China

关键词： MXene foam; polystyrene sphere; pore size; supercapacitors; templates

期刊名称：SMALL （ 影响因子：15.153； 五年影响因子：14.257 ）

ISSN： 1613-6810

年卷期： 2022 年 18 卷 27 期

页码：

收录情况： SCI

摘要： Wearable electronics demand energy storage devices with high energy density and fast charging-discharging rates. Although various porous electrodes have been constructed, the effect of pore size on the capacitive performance of 2D nanomaterials has been rarely studied. Herein, flexible MXene foams with significantly different pore structures are fabricated using varying diameter polystyrene (PS) spheres (80, 310, and 570 nm), which shows uniform pores and interconnected pores providing enough active sites and a good electrical connection for electron transfer. Noteworthy, when MXene flakes and templates (310 nm) have a similar size, the foam delivers the highest gravimetric capacitance of 474 +/- 12 F g(-1) at 2 mV s(-1) than others. Additionally, the mass ratio between MXene and PS controls the packing density of foams influencing the inner resistance of foam electrodes. A carbon nanotube is introduced to further improve the electrical conductivity of foams to achieve a capacitance of 462 +/- 8 F g(-1) at 2 mV s(-1) and retains 205 +/- 10 F g(-1) at 1000 mV s(-1), demonstrating promises in energy storage applications and providing an insightful guidance for designing 2D nanomaterials-based porous electrodes for supercapacitors.

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