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作 者:Haozhi Qi Yuyang Kang Jian-An Liu Lichang Yin Wenyu Zhang Shangyi Ma Jianhang Qiu Lingli Li Weijin Hu Lianzhou Wang Gang Liu
机构地区:[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]Nanomaterials Centre,School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology,The University of Queensland,St Lucia,Brisbane QLD 4072,Australia
出 处:《Science China Chemistry》2024年第10期3258-3264,共7页中国科学(化学英文版)
基 金:supported by the National Natural Science Foundation of China(52425201,52120105003,52002377,52372243);the National Key R&D Program of China(2021YFA1500800);the CAS Projects for Young Scientists in Basic Research(YSBR-004);the International Partnership Program of the Chinese Academy of Sciences(174321KYSB20200005);the financial support from the New Cornerstone Science Foundation through the XPLORER PRIZE。
摘 要:Ferroelectric materials hold great promise in photocatalytic water splitting because their built-in electric field induced by the depolarization field can fulfill the separation of photogenerated carriers.However,a number of intrinsic charged vacancy defects are simultaneously generated to screen the depolarized field for stabilizing the crystal structure,always resulting in severe recombination of photogenerated carriers and thus poor overall water splitting activity.Herein,we proposed a strategy to promote the separation and transport of photogenerated carriers of ferroelectric photocatalysts by adjusting the ferroelectric polarization and altering the coordination environment of elements to reduce the defect concentration.Specifically,we prepared a series of Ta-doped PbTiO_(3)with low Pb(V_(Pb))and O(V_(O))vacancy concentrations by reducing the polarization intensity and strengthening the Pb–O interaction.The Ta-doped PbTiO_(3)shows efficient charge separation and greatly enhanced photocatalytic overall water splitting activity with the assistance of cocatalyst.This work highlights the importance of regulating ferroelectric polarization and vacancy defect concentration by the doping strategy in charge separation for photocatalytic water splitting.
关 键 词:PbTiO_(3) ferroelectric polarization vacancy defect element doping photocatalytic overall water splitting
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