Electrolyte-Dependent Capacitance of Titanium Dioxide Nanotube Array Electrode Substrate

Abstract:

The anatase titanium dioxide nanotube array (TiO₂ NTA) with short and independent nanotube film structure is applied as stable metal oxide electrode substrate. The influence of different proton acid electrolytes is fully investigated on the electrical double-layer capacitance. The anatase TiO₂ NTA electrode substrate conducts reversible protonation-deprotonation process of dissociation hydrogen ion and electrostatic adsorption-desorption process of equilibrium anion in the cycling charge-discharge process. The reversible properties could be well proved by highly symmetric characteristic of positive-negative sweeping current and charge-discharge potential. The protonated TiO₂ NTA electrode substrate reveals cyclic voltammetry-based capacitances of 0.147 and 0.124 mF cm^-2, galvanostatic charge-discharge-based capacitances of 0.167 and 0.148 mF cm^-2 when similar dissociation proton concentration is maintained in 1.0 M H₂SO₄ and 1.0 M HCl. The TiO₂/H₂SO₄ exhibits similar capacitance enhancement ratio of 1.19 and 1.13 in comparison with of the TiO₂/HCl. The corresponding electrical double-layer capacitance at the same dissociation proton condition is mostly dependent on the electrostatic interaction between the protonated TiO₂ and equilibrium anions in different proton acid electrolytes rather than anion diffusion. The theoretical simulation calculation reveals that TiOOH⁺-HSO₄^- shows lower interaction interface energy and higher total densities of states than TiOOH⁺-Cl^-. Accordingly, TiO₂/H₂SO₄ conducts more feasible protonation and electrostatic adsorption process rather than TiO₂/HCl, contributing to its superior electrical double-layer capacitance.

• Periodical: Journal of Nano Research (Volume 75)
• Pages: 71-80
• DOI: https://doi.org/10.4028/p-72934g
• Online since: September 2022
• Authors: Feng Wu, Chen Yao, Yi Bing Xie*
• Keywords: Capacitance, Electrode Substrate, Electrolyte, Simulation Calculation, Titanium Dioxide Nanotube Array

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