Flowable Electrodes from Colloidal Suspensions of Thin Multiwall Carbon Nanotubes - Matériaux Hybrides et Nanomatériaux
Article Dans Une Revue Colloids and Interfaces Année : 2024

Flowable Electrodes from Colloidal Suspensions of Thin Multiwall Carbon Nanotubes

Résumé

Flowable electrodes, a versatile alternative to traditional solid electrodes for electrochemical applications, exhibit challenges of high viscosity and carbon content, limiting flow and device performances. This study introduces colloidal suspensions of thin multiwall carbon nanotubes (MWCNTs) with diameters of 10–15 nm as electrode materials. These thin nanotubes, stabilized in water with a surfactant, form percolated networks, exhibiting high conductivity (50 ms/cm) and stability at a low carbon content (below 2 wt%). Colloidal clustering is enhanced by weak depletion attractive interactions. The resulting suspensions display yield stress and a shear thinning behavior with a low consistency index. They can easily flow at a nearly constant shear over a broad range of shear rates. They remain electrically conductive under shear, making them a promising option for flow electrochemical applications. This work suggests that the use of depletion-induced MWVNT aggregates addresses crucial issues in flow electrochemical applications, such as membrane fragility, operating energy, and pressure. These conductive colloidal suspensions thereby offer potential advancements in device performance and lifespan.
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Dates et versions

hal-04744950 , version 1 (19-10-2024)

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Massinissa Hamouma, Wilfrid Neri, Xavier Bril, Jinkai Yuan, Annie Colin, et al.. Flowable Electrodes from Colloidal Suspensions of Thin Multiwall Carbon Nanotubes. Colloids and Interfaces, 2024, 8 (3), pp.32. ⟨10.3390/colloids8030032⟩. ⟨hal-04744950⟩
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