Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 14, Pages 7486-7491Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00123
Keywords
TiO2 nanotube array; electrochemical self-doping; electrochromism; capacitive and oxidant-generating properties
Funding
- Industrial Facilities & Infrastructure Research Program - Ministry of Land, Infrastructure, and Transport of Korean government [13IFIP-B065893-01]
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Recently, black-colored TiO2 NTA (denoted as black TiO2 NTA) fabricated by self-doping of TiO2 NTA with the amorphous phase led to significant success as a visible-light-active photocatalyst. This enhanced photocatalytic activity is largely attributed to a higher charge carrier density as an effect of electrochemical self-doping resulting in a higher optical absorbance and lower transport resistance. Nevertheless, the potential of black TiO2 NTA for other electrochemical applications, such as a supercapacitor and an oxidant-generating anode, has not been fully investigated. Here, we report the capacitive and oxidant generating properties of black TiO2 NTA. The black TiO2 NTA exhibited significantly a high value for areal capacitance with a good rate capability and novel electrocatalytic activity in generating (center dot)OHs and Cl-2 compared to pristine TiO2 NTA with the anatase phase. This study suggests that the black TiO2 NTA be applied as a supercapacitor and an oxidant generating anode.
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