Rapid fabrication of oxygen-deficient zirconia by flash sintering treatment  

作　　者：Xinghua Su Wenjin Li Da Chen Shuai Zhang Chengguang Lou Qiang Tian Jianguo Zhao Peng Zhao 

机构地区：[1]School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China [2]State Key Laboratory of Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China [3]School of Energy and Environment,Southeast University,Nanjing 210096,China [4]School of Physics and Electronic Information,Luoyang Normal University,Luoyang 471022,China

出　　处：《Journal of Advanced Ceramics》2024年第11期1881-1890,共10页先进陶瓷（英文）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52472064 and 12305298);the Open Project of State Key Laboratory of Environmentally-friendly Energy Materials(No.23kfhg06);the Sichuan Science and Technology Program(No.2022JDTD0017);the Natural Science Foundation of Jiangsu Province(No.BK20230864).

摘　　要：The introduction of oxygen vacancies into zirconia is an effective strategy for enhancing its light absorption ability and photocatalytic performance.However,the cost-efficient preparation of oxygen-deficient zirconia(ZrO_(2−x))remains challenging,which severely limits its broad application.In this study,flash sintering treatment was used to fabricate ZrO_(2−x) bulk in very short time of 90 s.Oxygen vacancies were introduced into ZrO2 bulk through electrochemical reduction reactions.The as-prepared black ZrO_(2−x) exhibited excellent optical absorption capability,a small band gap(2.09 eV for direct and 1.67 eV for indirect),and a reduced conduction band energy,which is ascribed to the generation of oxygen vacancies and reduction of Zr cations.The as-prepared ZrO_(2−x) showed remarkable photocatalytic activity due to excellent solar light absorption and low recombination rate of electron‒hole pairs.Flash sintering treatment provides a cost-efficient approach for rapidly fabricating ZrO_(2−x) bulk materials with high concentrations of oxygen vacancies,which can also be applied to other materials.

关 键 词：ZIRCONIA oxygen vacancy flash sintering treatment electrochemical reduction optical absorption 

分 类 号：TQ174[化学工程—陶瓷工业]