Photoelectrochemical Reactivity of a Hybrid Electrode Composed of Polyoxophosphotungstate Encapsulated in Titania Nanotubes

Abstract

A polyoxometalate‐modified titania hybrid electrode with a tailored microstructure is studied for its photoelectrochemical applications. A highly ordered TiO2 nanotube array is prepared by low‐voltage anodization followed by calcination. Functionalized polyoxophosphotungstate–titania/titanium (POW–TiO2/Ti) hybrid electrodes are synthesized by encapsulating POW nanoaggregates in the TiO2 nanotube array. The morphological characteristics and structures of POW–TiO2 composites are examined by field‐emission scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray spectroscopy, and Fourier transform IR spectroscopy. The photoelectrochemical properties of the POW–TiO2/Ti electrodes are investigated by anodic polarization photocurrent‐response measurements. Photocatalytic/photoelectrocatalytic reactivities of microstructured and nanotubular POW–TiO2/Ti photoanodes are studied for their use in the degradation of recalcitrant organic pollutants.

Template-free formation of vertically oriented TiO2 nanorods with uniform distribution for organics-sensing application

“…3) also demonstrate the grain growth. Other works confirmed the anatase TiO 2 after thermal treatment at 400-500 • C had a higher photoactivity, while the photoactivity decreased due to the sharp drop of the specific surface area after thermal treatment at higher temperature [30][31][32][33][34][35][36][37][38][39][40][41][42]. The other contribution to the higher photocurrent was ascribed to the mixed crystal effect because of the band match between anatase and rutile crystals.…”

Unique Features of the Photocatalytic Reduction of H2O and CO2 by New Catalysts Based on the Analogues of CdS, Cd4P2X3 (X = Cl, Br, I)

“…Transient photocurrent measurements were also carried out to further verify the role of Ni x P y as an acceptor of photogenerated electrons in Cd 4 P 2 X 3 (Figures S14). 36,37 Cd 4 P 2 X 3 /Ni x P y showed an enhancement in the photocurrent with respect to pristine Cd 4 P 2 X 3 suggesting the reduction in the rate of recombination of photogenerated charge carriers due to transfer of electron from Cd 4 P 2 X 3 to Ni x P y . Photocurrent values of Cd 4 P 2 Cl 3 /Ni x P y (1 wt %Ni x P y ), Cd 4 P 2 Br 3 /Ni x P y (5 wt % Ni x P y ), and Cd 4 P 2 I 3 /Ni x P y (1 wt % Ni x P y ) are consistent with their hydrogen yield.…”

A facile hydrothermal synthesis and properties of TiO2 nanosheet array films

“…The superhydrophilic of TiO 2 mainly depended on photo-carriers generation, electron-hole pairs separation and electron transfer efficiency on the surface of the semiconductor catalyst. Therefore, the response photocurrent intensity can reflect the overall photoelectron conversion efficiency [24]. The photocurrent-time curve results under the condition of on/off illumination with the solar simulator light source (AM 1.5 G, 100 mW cm −2 ) and a bias voltage of 0.6 V were shown in figure 7.…”