S型异质结Bi_(4)O_(5)Br_(2)/CeO_(2)的制备及其光催化CO_(2)还原性能  

Bi_(4)O_(5)Br_(2)/CeO_(2)Composite with S-scheme Heterojunction:Construction and CO2 Reduction Performance

作　　者：李跃军[1] 曹铁平[1] 孙大伟 LI Yuejun;CAO Tieping;SUN Dawei(Research Centre of Nano-Photocatalyst,Baicheng Normal University,Baicheng 137000,China)

机构地区：[1]白城师范学院纳米光催化材料研究中心,白城137000

出　　处：《无机材料学报》2023年第8期963-970,共8页Journal of Inorganic Materials

基　　金：国家自然科学基金(21573003)。

摘　　要：光催化CO_(2)还原技术的关键是开发高效光催化剂,而构建具有紧密界面结构的异质结是增强界面电荷转移,实现高效光催化活性的有效途径。本研究采用静电纺丝技术结合水热法,将Bi_(4)O_(5)Br_(2)纳米片镶嵌在CeO_(2)纳米纤维表面,制得Bi_(4)O_(5)Br_(2)/CeO_(2)纤维光催化材料(B@C-x,x对应反应物的加入量)。利用不同方法表征其微观结构、形貌和光电性能。结果表明,适当Bi_(4)O_(5)Br_(2)含量的Bi_(4)O_(5)Br_(2)/CeO_(2)异质结可以显著提高CeO_(2)纳米纤维的光催化性能。与纯Bi_(4)O_(5)Br_(2)和CeO_(2)相比,B@C-2在模拟太阳光下表现出最佳光催化活性,不使用任何牺牲剂或共催化剂的条件下,CO生成速率达到8.26μmol·h^(–1)·g^(–1)。这归因于Bi_(4)O_(5)Br_(2)和CeO_(2)之间的界面结合紧密以及构建的S型异质结,使得光生载流子可以实现有效的空间分离和转移。本研究为定向合成Bi基S型异质结复合光催化材料提供了一种简便有效的方法,为清洁能源转换探索了可行的途径。One of the basic challenges of CO_(2)photoreduction is to develop efficient photocatalysts.As an effective strategy,constructing heterostructure photocatalysts with intimate interfaces can enhance interfacial charge transfer for realizing high photocatalytic activity.Herein,a novel photocatalytic material,Bi_(4)O_(5)Br_(2)/CeO_(2)composite fiber(B@C-x,x refers to the amount of reactant),was constructed by embeding CeO_(2)nanofibers on Bi_(4)O_(5)Br_(2)nanosheets via an electrospinning combined with hydrothermal method.Its composition,morphology and photoelectric properties were characterized.The results show that Bi_(4)O_(5)Br_(2)/CeO_(2)heterojunction with appropriate Bi_(4)O_(5)Br_(2)content can significantly improve the photocatalytic performance of CeO_(2)nanofibers.Compared with pure Bi_(4)O_(5)Br_(2)and CeO_(2),B@C-2 exhibited the best photocatalytic activity under simulated sunlight.The Bi_(4)O_(5)Br_(2)/CeO_(2)exhibited improved photocatalytic CO_(2)reduction performance with a CO generation rate of 8.26μmol·h^(–1)·g^(–1)without using any sacrificial agents or noble co-catalysts.This can be attributed to the tight interfacial bonding between Bi_(4)O_(5)Br_(2)and CeO_(2)and the formation of S-scheme heterojunction,which enables the efficient spatial separation and transfer of photogenerated carriers.This work provides a simple and efficient method for directional synthesis of Bi-based photocatalytic composites with S-scheme heterojunction and illustrates an applicable tactic to develop potent photocatalysts for clean energy conversion.

关 键 词：Bi_(4)O_(5)Br_(2)/CeO_(2)复合纤维 异质结 光催化CO_(2)还原 水热法 

分 类 号：O643[理学—物理化学]