Carbon cladded TiO₂nanotubes: fabrication and use in 3D-RuO₂based supercapacitors

Abstract

In this work we introduce a facile procedure that allows a highly conformal coating of self-organized TiO 2 nanotubes (NTs) with a graphite-like thin carbon layer. This provides a platform to enhance the functionality of TiO 2 nanotubes for a wide range of applications.Here we show that such modified nanotubes can serve as a 3D scaffold for an ideal decoration with RuO 2 nanoparticles. Used as 3D pseudocapacitor electrode, capacitance values of up to 80 times higher than plain TiO 2 NTs, and a very high yield of utilization of RuO 2 (872 F g À1) and excellent long-term cycling stability can be reached.Supercapacitors have attracted wide attention due to the strongly increasing demand in technology for high power density energy storage devices.

An antibacterial platform based on capacitive carbon-doped TiO2 nanotubes after direct or alternating current charging

“…AC charging is also capable of producing post-charging properties, suggesting that the AC energy can be collected by TNT-C as well. In general, the antibacterial effects of TNT-C can be enhanced by increasing the sample capacitance 55 , 56 and optimizing the charging scheme.…”

“…The titania nanotubes were prepared by electrochemical anodization of a Ti metal foil in an NH 4 F-ethylene glycol solution and the ordered TNT-C was fabricated by annealing the as-anodized titania nanotubes in Ar 29 , 55 , 65 , 66 . The Ti foil with dimensions of 30 × 30 × 0.5 mm was ground with abrasive paper (from 400 to 2000-grit), cleaned ultrasonically in acetone, alcohol, and deionized water, and dried in nitrogen.…”

Semimetallic core-shell TiO 2 nanotubes as a high conductivity scaffold and use in efficient 3D-RuO 2 supercapacitors

“…In nanostructured forms, on the other hand, it tends to easily agglomerate during cycling; this leads to a decrease in the active area and the specific capacitance [5,7,8]. While the theoretical mass specific capacitance is 1400 to 2200 F.g -1 , the reported experimental values are significantly lower [9] -this difference is mostly due to an inefficient use of RuO2 (i.e. due to the use of nanoparticle structures that only partially can be intercalated during a charging cycle).…”

Growth of a TiO2 nanotubular layer without presence of nanograss in a short time

“…Titanium dioxide material has been studied and used in areas like dye sensitized solar cells [1], hydrogen generation by water photo electrolysis [2], photocatalytic reduction of CO 2 under outdoor sunlight [3], super capacitors [4], batteries [5], biomedical related applications including biosensors, molecular filtration, drug delivery, and tissue engineering [6][7][8], because of the particular properties of TiO 2 such as nontoxic, environmentally friendly, optical and electronic properties [9].…”