Carbon nanotube–MXene membranes for electrochemical energy applications

ESTILI Mehdi; SUZUKI Tohru

Poster Carbon nanotube–MXene membranes for electrochemical energy applications

ESTILI Mehdi (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Ceramics Group, National Institute for Materials Science) ; SUZUKI Tohru (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Ceramics Group, National Institute for Materials Science)

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ESTILI Mehdi, SUZUKI Tohru. Carbon nanotube–MXene membranes for electrochemical energy applications. https://doi.org/10.48505/nims.5608

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(abstract)

Multiwalled carbon nanotubes (MWCNTs) have shown effectiveness in improving MXenes’ accessibility for energy-related applications. However, the ability of individually-dispersed MWCNTs to control the structure of MXene-based macrostructures is unclear. Here, the correlation among composition, surface nano- and microstructure, MXenes’ stacking order, structural swelling, and Li-ion transport mechanisms and properties in individually-dispersed MWCNT-Ti3C2 films is investigated. The compact surface microstructure of MXene film, characterized by prominent wrinkles, is dramatically changed as MWCNTs occupy MXene/MXene edge interfaces. The 2D stacking order is preserved up to 30 wt% MWCNTs despite a significant swelling of ~400%. Such alignment is completely disrupted at 40 wt%, and a more pronounced surface opening and internal expansion of ~770% are realized. Both 30 wt% and 40 wt% membranes show stable cycling performance under a significantly higher current density due to faster transport channels. Notably, for the 3D membrane,　over-potential during repeated Li deposition/dissolution reactions is further reduced by ~50%. Ion-transport mechanisms in the absence and presence of MWCNTs are discussed. Furthermore, ultralight yet continuous hybrid films comprising up to ~0.027 mg/cm2 Ti3C2 can be prepared using aqueous colloidal dispersions and vacuum filtration for specific applications. The potential application of such ultralight membranes as interlayers for Li-O2 batteries is briefly examined.

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