EY-LaNiO_(3)光解水体系的构筑及其产氢性能

Construction of EY-LaNiO_(3)Dye-sensitized System for Photocatalytic H 2 Evolution

曙红(EY)敏化光解水产氢体系能有效地拓展光催化剂的光吸收范围,提高其光吸收强度.通过构筑EY-LaNiO_(3)光解水产氢体系,在5 h反应时间内其氢气产量达到151μmol,是相同反应条件下EY体系的8.9倍.光电化学测试显示LaNiO_(3)的引入能有效促进自由电子的转移,延长自由电子寿命,从而有利于光解水产氢效率的提高.同时,通过制备不同形貌和晶型的LaNiO_(3)材料,探究影响该体系产氢效率的因素.结果显示650℃下煅烧得到的LaNiO_(3)纳米颗粒比表面积较大,能够提供较多的催化反应活性位点,且结晶度高,缺陷少,有利于光生电子的传输,其产氢活性最佳.

Eosin Y(EY)sensitized system for photocatalytic H_(2) evolution can effectively expand the light absorption range of photocatalysts and improve its light absorption intensity.In this study,the EY-LaNiO_(3) dye-sensitized system was constructed,and the hydrogen(H_(2)) evolution reached 151μmol within the reaction time of 5 hours,which was 8.9 times that of the EY system under the same reaction conditions.Photoelectrochemical tests show that the introduction of LaNiO_(3) can effectively promote the migration of photoinduced electrons and prolong the lifetime of photoinduced electrons,contributing to hydrogen(H_(2)) evolution.In the meanwhile,LaNiO_(3) with different morphology and crystalline were synthesized to explore the factors which play key roles in the hydrogen(H_(2)) evolution efficiency of the system.The results show that the LaNiO_(3) nanoparticles calcined at 650℃have a larger specific surface area,which can provide more active sites for catalytic reactions,and at the same time,they have high crystallinity and fewer defects,which are beneficial to the migration of photoinduced electrons and have the best hydrogen(H_(2)) evolution activity.