Zhang Zhenzhen, Liang Yongqi, Huang Hanlin, Liu Xingyi, Li Qi, Chen Langxing, Xu Dongsheng
Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin, 300071, China.
Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Angew Chem Int Ed Engl. 2019 May 27;58(22):7263-7267. doi: 10.1002/anie.201900658. Epub 2019 Apr 29.
Composition engineering of halide perovskite allows the tunability of the band gap over a wide range so that photons can be effectively harvested, an aspect that is of critical importance for increasing the efficiency of photocatalysis under sunlight. However, the poor stability and the low photocatalytic activity of halide perovskites prevent use of these defect-tolerant materials in wide applications involving photocatalysis. Here, an alcohol-based photocatalytic system for dye degradation demonstrated high stability through the use of double perovskite of Cs AgBiBr . The reaction rate on Cs AgBiBr is comparable to that on CdS, a model inorganic semiconductor photocatalyst. The fact of fast reaction between free radicals and dye molecules indicates the unique catalytic properties of the Cs AgBiBr surface. Deposition of metal clusters onto Cs AgBiBr effectively enhances the photocatalytic activity. Although the stability (five consecutive photocatalytic cycles without obvious decrease of efficiency) requires further improvements, the results indicate the significant potential of Cs AgBiBr -based photocatalysis.
卤化物钙钛矿的组成工程使得带隙能够在很宽的范围内进行调节，从而可以有效地捕获光子，这对于提高太阳光下光催化的效率至关重要。然而，卤化物钙钛矿较差的稳定性和较低的光催化活性阻碍了这些容错材料在涉及光催化的广泛应用中的使用。在此，一种用于染料降解的醇基光催化系统通过使用Cs AgBiBr双钙钛矿表现出了高稳定性。Cs AgBiBr上的反应速率与模型无机半导体光催化剂CdS上的反应速率相当。自由基与染料分子之间快速反应这一事实表明了Cs AgBiBr表面独特的催化性能。在Cs AgBiBr上沉积金属簇有效地提高了光催化活性。尽管稳定性（连续五个光催化循环且效率无明显下降）仍需进一步提高，但结果表明基于Cs AgBiBr的光催化具有巨大潜力。
