FeNi层状双氢氧化物/TiO_(2)复合光催化剂的制备及其制氢性能  

FeNi Layered Double Hydroxide/TiO_(2)Composite Photocatalyst:Preparation and Hydrogen Production Performance

作　　者：崔文莉 安琳 张青红[1] 王宏志[1] 李耀刚[1] 侯成义 CUI Wen-Li;AN Lin;ZHANG Qing-Hong;WANG Hong-Zhi;LI Yao-Gang;HOU Cheng-Yi(School of Materials Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院,上海201620

出　　处：《无机化学学报》2021年第5期867-874,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51572046)资助。

摘　　要：层状双氢氧化物(LDH)的光生电子-空穴对易复合,虽然纳米薄片的结构促进了载流子分离,但其光催化效率仍然较低。我们利用LDH薄片结构的优势,将FeNi LDH和TiO_(2)通过静电自组装复合,设计制备出新型高效的FeNi LDH/TiO_(2)复合光催化材料,评价了其光催化分解水产氢性能。对其结构、光催化性能和光电化学等进行了详细表征。结果表明,FeNi LDH的高比表面积、复合物的异质结结构都有利于光生电荷的转移。光催化产氢结果表明,FeNi LDH/TiO_(2)复合材料的产氢速率(22.6mmol·g^(-1)·h^(-1))分别比纯TiO_(2)(0.1 mmol·g^(-1)·h^(-1))和FeNi LDH(0.05 mmol·g^(-1)·h^(-1))提高了226和452倍,表明了异质结在提高LDH光催化效率方面的重要作用。Layered double hydroxide(LDH)photogenerated electron-hole pairs are easy to recombine.Although the unique structure of nanosheets promotes the separation of carriers,the photocatalytic efficiency is still low.In this paper,taking advantage of its thin-film structure,FeNi LDH was combined with TiO_(2)by electrostatic self-assembly method to design and prepare efficient FeNi LDH/TiO_(2)composite photocatalysts,and evaluated its hydrogen produc-tion performance.Their structure,photocatalytic performance and photoelectrochemistry were characterized in detail.The results showed that the high specific surface area of FeNi LDH and the heterojunction structure of the composite were all conducive to photo-generated charge transfer.The results of photocatalytic hydrogen production showed that the hydrogen production rate(22.6 mmol·g^(-1)·h^(-1))of FeNi LDH/TiO_(2)composite was 226 and 452 times higher than that of bare TiO_(2)(0.1 mmol·g^(-1)·h^(-1))and FeNi LDH(0.05 mmol·g^(-1)·h^(-1))respectively,indicating the crucial role of heterojunction in improving the photocatalytic efficiency of LDH.

关 键 词：FeNi层状双氢氧化物 静电自组装 异质结 光催化产氢 

分 类 号：O643.36[理学—物理化学]