Enhancement of electrochemical capacitance by tailoring the geometry of TiO2 nanotube electrodes

Nanostructured TiO2 Arrays for Energy Storage

Because of their extensive specific surface area, excellent charge transfer rate, superior chemical stability, low cost, and Earth abundance, nanostructured titanium dioxide (TiO₂) arrays have been thoroughly explored during the past few decades. The synthesis methods for TiO₂ nanoarrays, which mainly include hydrothermal/solvothermal processes, vapor-based approaches, templated growth, and top-down fabrication techniques, are summarized, and the mechanisms are also discussed. In order to improve their electrochemical performance, several attempts have been conducted to produce TiO₂ nanoarrays with morphologies and sizes that show tremendous promise for energy storage. This paper provides an overview of current developments in the research of TiO₂ nanostructured arrays. Initially, the morphological engineering of TiO₂ materials is discussed, with an emphasis on the various synthetic techniques and associated chemical and physical characteristics. We then give a brief overview of the most recent uses of TiO₂ nanoarrays in the manufacture of batteries and supercapacitors. This paper also highlights the emerging tendencies and difficulties of TiO₂ nanoarrays in different applications.

In situ carbon-supported titanium dioxide (ICS-TiO2) as an electrode material for high performance supercapacitors

Supercapacitors have attracted significant attention in the last few years as they have the capability to fulfill the demand for both power and energy density in many energy storage applications. In this study, an in situ carbon-supported titanium oxide (ICS-TiO₂) electrode has been prepared using sucrose and TiO₂ powder. The ICS-TiO₂ powder was prepared by slipcasting, followed by the annealing of the TiO₂ slurry. Sucrose was added to the TiO₂ slurry as a soluble carbon source, and was converted into carbon at 600 °C then coated on the TiO₂ particles. The morphological and structural evolution of the electrode was investigated by FEG-SEM, FEG-TEM, XRD, BET, FTIR, XPS and Raman spectroscopy. The electrochemical characterization of ICS-TiO₂ demonstrated that this material exhibits an efficient value of specific capacitance (277.72 F g^-1 at 25 mV s^-1) for charge storage. ISC-TiO₂ also exhibits a specific capacitance of 180 F g^-1 at 2 A g^-1 in a 1 M Na₂SO₄ aqueous electrolyte. The results suggest that ICS-TiO₂ can be utilized as a high-performance electrode material for supercapacitors with desirable electrochemical properties.