Kim Choonsoo, Kim Seonghwan, Lee Jaehan, Kim Jiye, Yoon Jeyong
School of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Process, Seoul National University (SNU), Gwanak-gu, Daehak-dong, Seoul 151-742, Republic of Korea.
ACS Appl Mater Interfaces. 2015 Apr 15;7(14):7486-91. doi: 10.1021/acsami.5b00123. Epub 2015 Apr 1.
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 (•)OHs and Cl2 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.
最近，通过非晶相自掺杂二氧化钛纳米管阵列（TiO2 NTA）制备的黑色TiO2 NTA作为可见光活性光催化剂取得了显著成功。这种增强的光催化活性很大程度上归因于电化学自掺杂导致的更高电荷载流子密度，从而具有更高的光吸收率和更低的传输电阻。然而，黑色TiO2 NTA在其他电化学应用（如超级电容器和产氧化剂阳极）方面的潜力尚未得到充分研究。在此，我们报道了黑色TiO2 NTA的电容特性和产氧化剂性能。与具有锐钛矿相的原始TiO2 NTA相比，黑色TiO2 NTA表现出显著的高面积电容值、良好的倍率性能以及在生成羟基自由基（•OH）和氯气（Cl2）方面的新型电催化活性。这项研究表明，黑色TiO2 NTA可作为超级电容器和产氧化剂阳极应用。
