The BaTiO₃?TiO₂ composites were prepared by using hydrate barium hydroxide (Ba(OH)₂·8H₂O) and titanium dioxide (TiO₂) as raw materials with soft chemical hydrothermal method at 120 ℃ and different Ba/Ti molar ratios.The structure of the prepared composites with different Ba/Ti molar ratios was analyzed by X?ray diffraction (XRD),scanning electron microscopy (SEM),and UV?visible absorption spectroscopy (UV?Vis),the degradation effect of the complex on the simulated degradation pollutant,rhodamine B (RhB) was investigated.The results indicate that the BaTiO₃?TiO₂ composites obtained at a Ba/Ti molar ratio of 0.50 have an excellent catalytic effect for the degradation of rhodamine B (RhB) during the simulation of dye wastewater degradation.Meanwhile,more active sites formed at the Ba/Ti molar ratio of 0.50, which facilitated the photocatalytic reaction.

The spherical hexagonal phase tungsten oxide (h?WO₃) was synthesized by precipitation method. Then a series of hexagonal/monoclinic WO₃(h/m?WO₃) phase junction photocatalysts were controllable fabricated by regulating the phase transition process from hexagonal to monoclinic phase. The crystal phase structure and phase composition, particle size and specific surface area of these WO₃ catalysts were characterized by X?ray diffraction (XRD), scanning electron microscopy (SEM) and specific surface area (BET). The experimental results of photocatalytic O₂ evolution show that compared with the pure hexagonal phase WO₃, the h/m?WO₃ with suitable crystal phase composition exhibits remarkable photocatalytic performance. Based on the band positions of hexagonal and monoclinic phases, the surface photovoltage (SPV) characterization results show that the formation of h/m?WO₃ phase junction significantly promotes the efficient separation of photogenerated electrons and holes on the surface of the catalyst, and then improves the photocatalytic activity of WO₃ catalyst.

Ppb amount of SO₂ in air will react with cathode material of solid oxide fuel cell, inducing decrease of the cell/stack performance as one of the most effective factors.The sulfur poisoning behavior of (La_0.6Sr_0.4) (Co_0.2Fe_0.8)O₃(LSCF) and A?site deficient (La_0.6Sr_0.4)_0.85(Co_0.2Fe_0.8)O₃(LSCF85) was investigated after exposure to 30 μg/g SO₂ at 800 ℃ for 50 h.The products of the reaction were characterized by XRD,SEM and EDX to evaluate the effect of A?site defects on the sulfur poisoning behavior of perovskite ferrite based solid oxide fuel cell cathode materials. It was found that A?site defect in LSCF85 can suppress the chemical reaction between LSCF based cathode and SO₂. It was ascribed to the low Sr reaction activity with SO₂ caused by the existence of A?site defect.