Mechanically Induced Nanoscale Architecture Endows a Titanium Carbide MXene Electrode with Integrated High Areal and Volumetric Capacitance

Hongwu Chen; Huaipeng Wang; Chun Li

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Mechanically Induced Nanoscale Architecture Endows a Titanium Carbide MXene Electrode with Integrated High Areal and Volumetric Capacitance

机译：Mechanically Induced Nanoscale Architecture Endows a Titanium Carbide MXene Electrode with Integrated High Areal and Volumetric Capacitance

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Complete utilization of electrochemically active materials while maintainingthe high areal/volumetric packing density is a goal to be achieved in miniaturizedsupercapacitor devices, which therefore display both high volumetric andareal energy density. Although critical, it is usually challenging to achieve thisgoal by optimizing the electrode architecture. Dense packing of active materialsmaximizes the volumetric capacitance but also results in sluggish diffusion ofthe electrolyte. Structurization of the electrode by forming large pores creates apathway for electrolyte penetration but reduces the volumetric energy density.Here, densified electrodes with hierarchical porous architecture at the nanoscaleare reported, which provide an alternative solution. Worm-like expanded titaniumcarbide MXene powders are produced in highly viscous reaction mediaand assembled by mechanical compression. The expanded morphology of theMXene powders translates into a buckling microstructure in the electrodes,resulting in 28.2 ± 4.1 porosity mainly in the form of nanosized pores. At thesub-nanometer scale, the diffusion of electrolytes is enhanced in interlayer spaceof the bended lattice with pillared intercalants. These hierarchical structuralfeatures lead to both high areal and volumetric capacitance (11.4 F cm~(?2) coupledwith 770 F cm~(?3)) in hundred-micrometers-thick electrodes, which inspires thedesign of high-performance electrochemical energy storage devices.

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来源
《Advanced Materials》 |2022年第43期|2205723.1-2205723.10|共10页
作者
Hongwu Chen; Huaipeng Wang; Chun Li;
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作者单位

Key Lab of Organic Optoelectronics and MolecularEngineering of Ministry of EducationDepartment of ChemistryTsinghua UniversityBeijing 100084, China, Laboratory of Flexible Electronics TechnologyTsinghua UniversityBeijing 100084, China;

School of Integrated CircuitsBeijing National Research Center for Information Scienceand Technology (BNRist)Tsinghua UniversityBeijing 100084, China;

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正文语种英语
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mechanical compression; powder materials; structural stability; supercapacitors; titanium carbide Mxene;

Mechanically Induced Nanoscale Architecture Endows a Titanium Carbide MXene Electrode with Integrated High Areal and Volumetric Capacitance

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