| 초록 |
We investigated black TiO2 nanotubes exposed with {001} facet (denoted as {001}-Black TNT) for the electrochemical production of reactive chlorine species (RCS) that highly remove aqueous organic pollutants. The X-ray diffraction (XRD) spectra of {001}-TNT and {001}-Black TNT showed the surface alignment with {001} exposed facets. On the other hand, the surface of bare TNT and Black TNT is mainly composed of {101} facet anatase. The X-ray photoelectron spectroscopy (XPS) analysis confirmed the existence of oxygen vacancies on the surface of hydrogenated TNT samples. Vertically aligned nanotube structures were examined by scanning electron microscopy. The electrochemical analysis indicated that {001}-Black TNT showed higher electrochemical properties compared to other TNT samples. In addition, the generation of RCS and current efficiency were markedly enhanced on {001}-Black TNT in electrochemical conditions. Similar trends were observed for the degradation of organic pollutants. The co-existence of {001} facet and oxygen vacancies on the {001}-Black TNT surface seemed to induce a highly synergic enhancement in electrical conductivity, RCS generation, and organics oxidation. |
