热处理温度对TiO2-WO3复合光催化材料储能特性的影响

以离子交换法获得的可溶性钨酸溶液与TiO₂为原料，制备了TiO₂-WO₃复合光催化材料. 用电化学恒电流放电法表征了材料的储能特性，并结合XRD、TEM、BET、UV-Vis等手段，研究了材料中WO₃的晶型和结晶度随热处理温度的变化及其对材料光催化储能效应产生的影响. 在电化学测试中，TiO₂-WO₃复合材料显示了一定的光催化储能特性. 且WO₃的结晶度对材料储能性有一定的影响：WO₃为水合态或结晶度很低时，材料几乎没有光催化储能性；随着结晶度的增强，储能性提高；TiO₂-WO₃的储能性能最高达到0.83×10^-3C·mg^-1； 结晶度过高，储能性反之降低. 利用材料的光催化储能特性，在黑暗条件下对罗丹明B的降解率为11％，显示了一定的储能降解活性.

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

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 WO₃ with 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%.