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mnpl/3659/5548/2023/Quantum capacitance governs electrolyte conductivity in carbon nanotubes

Received 17, March 2023
Revised 26, May 2023
Accepted 29, July 2023

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Mon Jul 31 2023 06:30:00 GMT+0000 (Coordinated Universal Time)

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Quantum capacitance governs electrolyte conductivity in carbon nanotubes

Th´eo Hennequin and Manoel Manghi∗ Laboratoire de Physique Th´eorique, Universit´e Paul Sabatier–Toulouse III, CNRS, France Adrien Noury, Fran¸cois Henn, Vincent Jourdain, and John Palmeri† Laboratoire Charles Coulomb, Universit´e de Montpellier, CNRS, France
Acknolowdgement NA

Keyword Highlighted

Quantum capacitance, carbon nanotubes, nano

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In recent experiments, unprecedentedly large values for the conductivity of electrolytes through carbon nanotubes (CNTs) have been measured, possibly owing to flow slip and a high pore surface charge density whose origin is still unknown. By accounting for the coupling between the quantum CNT and the classical electrolyte-filled pore capacitances, we study the case where a gate voltage is applied to the CNT. The computed surface charge and conductivity dependence on reservoir salt concentration and gate voltage are intimately connected to the CNT electronic density of states. This approach provides key insight into why metallic CNTs have larger conductivities than semiconducting ones.