Publication date: 31st March 2013
Enhancement of Titanium oxide nanotubes capacitance by electrochemical hydrogenation
Abdullah Al-Mayoufa,d* , Amal Ba-Qaisb, Mansour Alhoshanc,d
a Chemistry Department, College of Science, King Saud University
bChemistry Department, College of Science, Princess Nora Bint AbdulRahman University
c Chemical Enegineering Department, College of Enegineering , King Saud University
Riyadh-Saudi Arabia E-mail address: amayouf@ksu.edu.sa and aabaqeis @pnu.edu.sa
d Sustainable Energy Technologies(SET), KSU. SA.
A simple approach was used to improve the capacitive properties of titanium oxide TiO2 nanotube (TONT) arrays for supercapacitors applications. This approach involves electrochemical hydrogenation of TONT arrays in acidic media. At first, arrays of TONTs were fabricated by anodization of Ti foil in aqueous fluoride solution. The obtained TONTs were then subjected to annealing in air. Electrochemically hydrogenated TONTs were obtained by holding the potential of the sample at negative potential in acidic media. Hydrogenated TONTs became more active towards hydrogen evolution (HE). This activity was more pronounced in anatase phase than other phases. Activated samples showed an increase of 10 times in capacitance compared to non activated TONT arrays. This improvement of the capacitive properties of TONTs potentially leads to high performance supercapacitor applications.
Cyclic voltammogram of the TiO2 oxide samples in 0.5M H2SO4 after hydrogenation (potential holding the potential at OCP for 90 min.)
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