以Nb2O5为原料,采用一种新型的聚合物前驱体法制备了层状结构K4Nb6O17薄膜.经600℃以上的温度处理,得到了纳米晶的具有(040)取向的薄膜.XPS测量表明该薄膜的元素比K:Nb:O为4.08:5.99:16.77,符合K4Nb6O17的化学计量比.分解水制氢实验表明该薄膜具有良好的光催化性能.应用Boltzmann方程对产氢量的时间曲线进行了分析.结果表明,结晶性能直接影响了薄膜的产氢行为.
Layered niobate(K4Nb6O17)thin films were firstly synthesized by a novel polymerized precursor method using niobium oxide(Nb2Os)powder as starting material.After annealing at 600℃or above,the nanostructured K4Nb6O17 thin films with(040)preferred orientation were successfully produced.XPS measurement showed that the atomic ratio of K:Nb:O evolution from water decomposition showed the excellent photocatalytic properties of the films.The Boltzmann equation was applied to compute the time course of the hydrogen evolution and it indicated that the crystallization was responsible for the high photocatalytic performance.
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