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Synergically enhanced piezocatalysis performance of eco-friendly(K_(0.52)Na_(0.48))NbO_(3) through ferroelectric polarization and defects

查看全文 作　　者：Min [1]Zhou;Laijun [1]Liang;Dingze [1]Lu;Xiaomei [2,3]Lu;Zheng [4]Wang;Fengzhen [2,3]Huang;Pengfei [1]Cheng;Dongdong [1]Liu;Mengqi [1,5]Tian;Qiuping [1]Wang;Yunjie [1]Zhang 高影响力作者 机构地区：[1]School of Science,Xi’an Polytechnic University,Xi’an 710048,China;[2]National Laboratory of Solid State Microstructures and Physics School,Nanjing University,Nanjing 210093,China;[3]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;[4]School of Advanced Materials and Nanotechnology,Xidian University,Xi’an 710126,China;[5]National Engineering Laboratory for Modern Silk,College of Textile and Clothing Engineering,Soochow University,Suzhou 215123,China高影响力机构 出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2023年第30卷第10期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos.52172116 and 62171214);the Natural Science Basic Research Program of Shaanxi (Nos.2021JQ-655,2020JQ-828,2021JQ-188,2021JM-442,and 2020JQ-822);the Shaanxi Provincial Association of Science and Technology Youth Talents Lifting Plan (No.20180418);the Scientific Research Foundation for Ph.D.of Xi’an Polytechnic University (No.BS201877);the Special Scientific Research Project in Shaanxi Province Department of Education (No.21JK0653). 摘　　要：Piezocatalysis has attracted unprecedented research interest as a newly emerging catalysis technology.However,the inherent insulating property of ferroelectric materials ultimately leads to the poor vibration-electricity conversion ability.Herein,this work reports the(K_(0.52)Na_(0.48))NbO_(3) ferroelectric ceramics(KNNFCx),for which the FeCo modification strategy is proposed.The substitution of the moderate amount of FeCo(x=0.015)at Nb site not only optimizes ferroelectricity but also produces beneficial defects,notably increasing Rhodamine B water purification efficiency to 95%.The pinning effect of monovalent oxygen vacancies on ferroelectric domains is responsible for the excellent ferroelectric polarization of KNNFC0.015 through the generation of an internal field to promote charge carriers separation and reduce nonradiative recombination.Importantly,the accompanying electron carriers can easily move to the material surface and participate in redox reactions because they have low activation energy.Therefore,ferroelectric polarization and defects play synergetic roles in enhancing piezocatalytic performance. 关 键 词：piezocatalytic water purification ferroelectric polarization beneficial defects
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