Enhanced supercapacitance in anodic TiO₂nanotube films by hydrogen plasma treatment

Abstract

One-dimensional anodic titanium oxide (ATO) nanotube arrays hold great potential as electrode materials for high-performance electrochemical supercapacitors. However, their poor electronic conductivity limits their practical applications. Here, we develop a hydrogen (H2) plasma treatment method to greatly improve the electrochemical performance of ATO electrodes. Compared with pristine ATO, the nanotubes treated by H2 plasma illumination (ATO-H) present a rough and amorphous layer at the surface of the nanotubes with simultaneously incorporated Ti(3+) and -OH groups. At a current density of 0.05 mA cm(-2) in charge-discharge measurements, the specific capacitance of the ATO-H electrode has substantially increased ~7.4 times, with a value as high as 7.22 mF cm(-2). Moreover, the novel ATO-H electrode has also exhibited excellent rate capability (6.37 mF cm(-2) at a current density of 2 mA cm(-2)) and cycling performance with no degradation after 10,000 cycles.

Titanium Dioxide Nanotube Films for Electrochemical Supercapacitors: Biocompatibility and Operation in an Electrolyte Based on a Physiological Fluid

“…[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Our values are close to the bottom of the range. The higher values of capacitance can be obtained when the samples are subjected to additional treatments such as annealing in Ar atmosphere, 14,21-23 thermal treatment in H 2 atmosphere, 15,19 annealing in NH 3 atmosphere, 16 cathodic biasing of TiO 2 in an ethylene glycol electrolyte, 18 second anodization with post-annealing in vacuum, 20 electrochemical hydrogenation or plasma-treatment, 24,25 and cathodic polarization treatment. 27,28 Optimization of the electrochemical performance is, however, beyond the scope of this paper.…”

Photon Absorption Enhancement of TiO2 Nanotube Arrays Decorated with Aluminum Nanoparticles

“…Tian et al [83] deposited one layer of TiO2 nanoparticles on the titanium sheet, put it in the 10mol/L NaOH solution, after calcintion at 160 (2) Anodic Titanium Nanotubes…”

Catalysis-Based Cataluminescent and Conductometric Gas Sensors: Sensing Nanomaterials, Mechanism, Applications and Perspectives

“…Conductometric gas sensors based on nanomaterials are promising to improve gas-sensing properties including sensitivity, selectivity and response/recovery speeds due to their large specific surface area and high catalysis activity [68][69][70]. Here, some nanomaterial-based semiconductor gas sensors are summarized to show the gas-sensing enhancement effect.…”