低碳化学与化工2024，Vol.49Issue(5)：21-27,43,8.DOI:10.12434/j.issn.2097-2547.20230377
无铅钙钛矿纳米晶的制备及其光催化二氧化碳还原性能研究
Study on preparation of lead-free perovskite nanocrystals and their photocatalytic performances in carbon dioxide reduction
摘要
Abstract
All-inorganic lead halide perovskites with excellent optoelectronic properties are ideal materials for photocatalytic carbon dioxide reduction.However,the toxicity and inherent instability of Pb limit their practical commercial application.To this end,lead-free perovskite materials Cs2PtBr6 microcrystal and Cs2PtBr6 nanocrystal were synthesized by anti-solvent method.The morphologies,compositions and optoelectronic properties of the samples were characterized by SEM,TEM,XRD and Ultraviolet-visible absorption spectrum,et al.The results show that the specific surface area of the sample is increased and the absorption performance is enhanced after Cs2PtBr6 microcrystal is converted into Cs2PtBr6 nanocrystal.The average photogenerated carrier lifetime is extended from 1.83 ns in Cs2PtBr6 microcrystal to 2.42 ns in Cs2PtBr6 nanocrystal.Moreover,the average photocurrent density of Cs2PtBr6 nanocrystal is 6.4 times stronger than that of Cs2PtBr6 microcrystal,and the charge transfer resistance of Cs2PtBr6 nanocrystal is smaller than corresponding value of Cs2PtBr6 microcrystal,so the separation and transfer efficiency of photogenerated carriers are improved.Among them,Cs2PtBr6 nanocrystal synthesized under 50℃of stirring temperature has the highest photocatalytic activity,and the carbon monoxide yield under the set up conditions of VCO2:VH2:VN2=21:63:16,total mass empty speed is 20000 mL/(g·h)and visible light irradiation for 3 h is 74.8 μmol/g,and the selectivity of carbon monoxide reaches 100%.These results can provide reference for the development of high-performance photocatalysts.关键词
光催化/二氧化碳还原/无铅钙钛矿/纳米晶Key words
photocatalysis/carbon dioxide reduction/lead-free perovskites/nanocrystal分类
化学化工引用本文复制引用
李银成,林介本,梁俊辉,郭震宁..无铅钙钛矿纳米晶的制备及其光催化二氧化碳还原性能研究[J].低碳化学与化工,2024,49(5):21-27,43,8.基金项目
国家自然科学基金青年项目(62304214) （62304214）
泉州芯谷半导体现代产业学院产学项目(MKCYXY-2023-01) （MKCYXY-2023-01）
半导体照明与光伏应用创新团队(MKKYTD202301) （MKKYTD202301）
福建高校杰出青年科研人才培育计划(闽教科[2018]47号). （闽教科[2018]47号）
