铁电极化内建电场作用下半导体光催化性能研究  

Photocatalytic performance of semiconductors withferroelectric polarization-generated built-in electric field

作　　者：王振慧 陈小雨 唐博 郭致昂 赵夷雯 杨森 范保艳 邢安 刘晓燕 WANG Zhenhui;CHEN Xiaoyu;TANG Bo;GUO Zhiang;ZHAO Yiweng;YANG Sen;FAN Baoyan;XIN An;LIU Xiaoyan(School of Metallurgy and Materials Engineering,Chongqing Key Laboratory of nanocomposites,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆科技学院冶金与材料工程学院,纳微复合材料重庆市重点实验室,重庆401331

出　　处：《功能材料》2022年第11期11192-11197,11205,共7页Journal of Functional Materials

基　　金：2020年度重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0930);重庆科技学院研究生科技创新计划项目(YKJCX2020210);重庆科技学院研究生科技创新计划项目(YKJCX2020237)。

摘　　要：铁电材料特有的自发极化能够产生极化内建电场。研究采用物理分散法将Ag_(2)O和CdS纳米颗粒负载于铁电LiNbO_(3)和玻璃基底表面,选择罗丹明B(RhB)作为代表性有机污染物,评价在不同基底表面的Ag_(2)O和CdS的光催化降解效率。结果表明,同一种半导体纳米颗粒在不同基底表面的光催化活性依次表现为LiNbO_(3)(+Z)>glass>LiNbO_(3)(-Z);在相同基底表面,Ag_(2)O比CdS表现出更优的光催化活性。基于铁电极化产生的半导体/铁电界面内建电场和光催化降解反应,提出了铁电极化影响半导体光催化降解性能的作用机制。Spontaneous polarization of ferroelectric materials can generate a built-in electric field.In this study,Ag_(2)O and CdS nanoparticles were supported on ferroelectric LiNbO_(3) and glass substrates by physical dispersion method,and Rhodamine B(RhB)was selected as a representative organic pollutant to evaluate the photocatalytic degradation efficiency of Ag_(2)O and CdS on the different substrates.The results show that the photocatalytic activity of the same semiconductor nanoparticles on different substrates is LiNbO_(3)(+Z)>glass>LiNbO_(3)(-Z).On the same substrate,Ag_(2)O exhibits better photocatalytic activity than CdS.Based on the polarization-generated built-in electric field at the interface of semiconductor/ferroelectric and the photocatalytic degradation reaction,the mechanism of ferroelectric polarization affecting the photocatalytic degradation performance of semiconductors is proposed.

关 键 词：铌酸锂 铁电自发极化 内建电场 半导体 光催化降解 

分 类 号：O6[理学—化学]