Effect of Heat Treatment Temperature on Energy Storage Ability of TiO2-WO3 Composite Photocatalyst

doi:10.3724/SP.J.1077.2009.00448

Abstract

Abstract: TiO₂-WO₃ photocatalyst powder was made from TiO₂ powder and soluble tungstic acid. The energy storage behavior was characterized by electrochemical galvanostatic method. Combined with XRD, TEM and BET, crystalline form and crystallinity changing of WO₃with heat treatment was studied. TiO₂-WO₃ composite materials have energy storage ability in electrochemical measurement. The crystallinity of WO₃ has strong influence on samples’ performance. When WO₃ is tungstite or amorphous, the TiO₂-WO₃ composites have no or quite low energy storage capacity. The energy storage capacity is improved with the crystallinty of WO₃ increasing. The maximum of TiO₂-WO₃ energy storage capacity is 0.83×10^-3 C·mg^-1. But when the crystallinity of WO₃ is high, the energy storage capacity decreases. And degradation experiment displays that Rhodamine B can be degraded in darkness by the TiO₂-WO₃ photocatalyst with energy storage ability, and the degradation efficiency reaches 11%.

Key words: photocatalyst, TiO₂-WO₃, energy storage

CLC Number:

O649
TB34

CAO Ling-Lin,YUAN Jian,CHEN Ming-Xia,SHANGGUAN Wen-Feng. Effect of Heat Treatment Temperature on Energy Storage Ability of TiO₂-WO₃ Composite Photocatalyst[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00448.

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Effect of Heat Treatment Temperature on Energy Storage Ability of TiO₂-WO₃ Composite Photocatalyst

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