Effect of Annealing Temperature on the Capacitive and Oxidant-generating Properties of an Electrochemically Reduced TiO2 Nanotube Array

Photoelectrochemical Degradation of Organic Compounds Coupled with Molecular Hydrogen Generation Using Electrochromic TiO2 Nanotube Arrays

“…Our estimation suggested the donor density of TNTs and Blue-TNTs to be 9.92 × 10 20 and 3.63 × 10 23 cm –3 , respectively. Consequently, the presence of Ti 3+ as a defect in Blue-TNTs notably enhanced the electrical conductivity and charge carrier density, which reconfirmed the previous report. ,, Our results further showed that the corresponding improvement in interfacial charge transfer is more pronounced in a PEC condition, rationalizing the application of Blue-TNTs as a photoanode. More direct evidence are presented in the linear sweep voltammograms (Figure c) obtained with and without UV (λ > 320 nm) irradiation.…”

Quantitative Photoelectrochemical Conversion of Ammonium to Dinitrogen Using a Bromide-Mediated Redox Cycle

“… where C sc is the space charge capacitance (F cm –2 ); e is the elementary charge (1.602 × 10 –19 C); ε is the relative dielectric constant of electrode material (48 for anatase TiO 2 ); ε 0 is the permittivity of vacuum (8.85 × 10 –12 N –1 C 2 m –2 ); E S is the applied potential (V); E FB is the flat band potential (V); k is Boltzmann’s constant (1.38 × 10 –23 J K –1 ), and T is the absolute temperature (K). The presence of Ti 3+ as a defect would enhance the charge carrier density and electrical conductivity of the Blue-TNTs. , The electrolyte composition little affected the observed N D value, whereas a negative shift in E FB was markedly observed for the intact-TNTs in the presence of Br – . Both TNTs showed measurable IPCE values (at +1.0 V vs Ag/AgCl, Figure d) under irradiation of λ < 400 nm, corresponding to an effective bandgap near 3.1 eV; the peak IPCE values of Blue-TNTs and intact-TNTs were about 53% and 38% at 360 nm, respectively.…”

“…The presence of Ti 3+ as a defect would enhance the charge carrier density and electrical conductivity of the Blue-TNTs. 35,36 The electrolyte composition little affected the observed N D value, whereas a negative shift in E FB was markedly observed for the intact-TNTs in the presence of Br − . Both TNTs showed measurable IPCE values (at +1.0 V vs Ag/AgCl, Figure 1d) under irradiation of λ < 400 nm, corresponding to an effective bandgap near 3.1 eV; the peak IPCE values of Blue-TNTs and intact-TNTs were about 53% and 38% at 360 nm, respectively.…”

High chlorine evolution performance of electrochemically reduced TiO2 nanotube array coated with a thin RuO2 layer by the self-synthetic method

“…By annealing the as-prepared TiO 2 NTA at 450 C for 1 h in air, the crystal structure was converted into an anatase-dominant phase (a-TiO 2 ). 34 Then, electrochemical doping was performed on the a-TiO 2 under cathodic polarization with constant current (16.7 mA cm À2 ) for 90 s in a phosphate buffer solution ([KH 2 PO 4 ] 0 ¼ 0.1 M with KOH, pH ¼ 7.02). [28][29][30] The prepared r-TiO 2 had a thickness of approximately 13.8 mm and the width of the nanotubes was 130 AE 30 nm (Fig.…”