Capacitive and Oxidant Generating Properties of Black-Colored TiO₂ Nanotube Array Fabricated by Electrochemical Self-Doping

다국어 초록 (Multilingual Abstract)

<P>Recently, black-colored TiO<SUB>2</SUB> NTA (denoted as black TiO<SUB>2</SUB> NTA) fabricated by self-doping of TiO<SUB>2</SUB> 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 TiO<SUB>2</SUB> 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 TiO<SUB>2</SUB> NTA. The black TiO<SUB>2</SUB> NTA exhibited significantly a high value for areal capacitance with a good rate capability and novel electrocatalytic activity in generating <SUP>•</SUP>OHs and Cl<SUB>2</SUB> compared to pristine TiO<SUB>2</SUB> NTA with the anatase phase. This study suggests that the black TiO<SUB>2</SUB> NTA be applied as a supercapacitor and an oxidant generating anode.</P><P><B>Graphic Abstract</B>
<IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-14/acsami.5b00123/production/images/medium/am-2015-00123w_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b00123'>ACS Electronic Supporting Info</A></P>