WO3氢致变色材料的制备

Preparation of WO3 Hydrochromic Material

WO3是一种非常典型的过渡金属氧化物半导体材料,因其价态的多样性和价电子构型的独特性而表现出特殊的光学、电学、力学性能,在电致变色、光催化、气体传感器、超级电容器以及太阳能电池等领域的应用显示出了极为优异的性能。通过沉淀法和水热法来制备掺杂三氧化钨粉体,并对样品的晶体结构进行性能分析和氢敏测试。通过XRD衍射分析得到,沉淀法制备出的粉体为H2WO4·H2O,属于单斜晶系;水热法制备出的产物是WO3·H2O,属于正交晶系。掺杂的粉体均从淡黄色变为蓝色,而且对氢气的响应时间与掺杂的元素有关。掺钯的粉体的变色响应时间45s,掺铂的三氧化钨粉体变化的更明显。

The WO3 is a very typical transition metal oxide semiconductor material.It exhibits special optical,electrical and mechanical properties due to the diversity of its valence states and the uniqueness of its valence electron configuration.The applications of WO3 in the fields of electrochromism,photocatalysis,gas sensors,supercapacitors and solar cells have shown an extremely excellent performance.The doped tungsten trioxide powder is prepared by precipitation and hydrothermal methods,and the performance analysis and hydrogen sensitivity of the samples’ crystal structure is carried out.According to the XRD diffraction analysis,the powder prepared by the precipitation method is H2WO4·H2O,which belongs to the monoclinic system;the product prepared by the hydrothermal method is WO3·H2O,which belongs to the orthogonal crystal system.The color of doped powders changes from light yellow to blue,and the response time to hydrogen is related to the doped elements.The discoloration response time of the palladium-doped powder is 45s.The change of the platinum-doped tungsten trioxide powder is more obvious.