Photoelectrochemical properties of titanium niobate (TiNb2O7) and titanium tantalate (TiTa2O7)

Abstract

The diffuse reflection spectra and the p~t~lectr~h~~l properties of TiNb20;1 and TiTa2~ are reported. Both compounds show an optical absorption edge near 3.0 eV.TiNb207 can be used as photoanode in a photwlectrochemical cell. 'Ibe onset potential of the photocurrent is about -0.9 V 2 SCE in 1M NaOH. TITa207 appears to be unstable in this electrolyte.

Atomic-scale investigation on lithium storage mechanism in TiNb2O7,

“…monoclinic structure to rutile structure in a reduced CO/CO 2 atmosphere at 1400 C. 17 As a photoelectrochemical material, Harrt, et al found that the onset potential of the photocurrent was about À0.9 V vs. SCE in 1 M NaOH solution when TiNb 2 O 7 was used as a photoanode with its optical absorption edge near 3.0 eV. 18 However, reversible lithium insertion of Nb-based materials, including TiNb 2 O 7 , was observed without further analysis by Cava, et al until 1998. 19 Recently, TiNb 2 O 7 has been proposed by Goodenough as an anode material to replace Li 4 Ti 5 O 12 used in lithium ion batteries.…”

On the Entangled Growth of NaTaO3 Cubes and Na2Ti3O7 Wires in Sodium Hydroxide Solution

“…Mertin et al investigated titanium tantalates, TiTa 2 O 7 , and their formation in the high temperature regime between 1673 and 1773 K. [14] Photoelectrochemical studies on these materials revealed a comparatively low stability in NaOH-based electrolytes. [15] Mixed ternary titanium tantalum oxides of the general formula ATiTaO 5 (with A = K, Rb) were reported to adopt sheet-like structures. [16] Therein, titanium and tantalum atoms each preferentially occupy positions inside two crystallographically different BO 6 octrahedra (with B = Ta, Ti).…”

Pressure and temperature-dependent optical properties of TiTa2O7

“…7b, which ts well with previous study. 2,4 The sample maintained a relatively clear absorption edge within the pressure range of 0-12 GPa. It can be observed that the direct bandgap energy of TiTa 2 O 7 exhibits a strong nonlinear pressure dependence up to 15 GPa.…”

“…1 In recent years, the tantalates and niobates with titanium were found to have excellent photocatalysis, for example: TiNb 2 O 7 (ref. 2) and NaTaO 3 . 3 Tantalate photocatalysts have unique electronic and band structure and their catalytic performance is better than other types of compounds in the decomposition of water to hydrogen, good examples are Ti-Ta alloy-based nanotubular oxide 4 and mesoporous Ta 2 O 5 -TiO 2.…”