激光加热辅助(La,Sr)(Ti,Co)O_(3)钙钛矿粉体制备及表征  

Preparation and characterization of(La,Sr)(Ti,Co)O_(3) perovskite powder assisted by laser heating

作　　者：胡昕 齐锦刚[1] 于文雯 邹德敏 商剑[1] 唐立丹[1] 程宇 HU Xin;QI Jin-gang;YU Wen-wen;ZOU De-min;SHANG Jian;TANG Li-dan;CHENG Yu(School of Materials Science and Engineering,Liaoning University of Technology,Jinzhou 121000,Liaoning Province,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121000

出　　处：《化学工程》2023年第1期21-25,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51354001);辽宁省百千万人才工程资助项目(2018B014)。

摘　　要：激光作为一种瞬时高能的加工工艺,近年来逐渐实现多元化的应用,能够大幅缩短材料的制备时长,降低时间成本。基于溶胶凝胶法,通过激光加热辅助制备(La_(0.7)Sr_(0.3))_(0.93)(Ti_(0.93)Co_(0.07))O_(3)钙钛矿粉体,该工艺可使粉体制备时长由十几小时缩短至几十秒,且组织性能表现优异。通过X射线衍射(XRD)和扫描电镜(SEM)表征发现,激光加热后粉体的衍射峰锐化且无其他杂质峰生成,粉体表面致密,呈阶梯状。电化学测试结果表明:激光加热后CV曲线面积增大,起始电位为0.430 V,当电位为0.8 V时电流密度达到200.1 mA/cm^(2),是高温煅烧后粉体电流密度的2.2倍,内阻为0.94117Ω·cm^(2),有着良好的氧化还原性能及OER催化活性。激光加热能够代替高温煅烧作为一种稳定钙钛矿晶型结构的高效制备工艺。As an instantaneous high-energy processing technology,laser has gradually achieved diversified applications in recent years,which can significantly shorten the preparation time of materials and reduce the time cost.Based on the sol-gel method,the preparation of(La_(0.7)Sr_(0.3))_(0.93)(Ti_(0.93)Co_(0.07))O_(3)perovskite powder assisted by laser heating can reduce time from more than ten hours to tens of seconds with excellent tissue properties.Characterization through X-ray diffraction(XRD)and scanning electron microscopy(SEM)reveals that the diffraction peaks of the powder are sharpened with no other impurity peaks after laser heating and the surface is dense and in a step shape.The electrochemical test results show that the CV curve area increases after laser heating with the starting potential 0.430 V.When the electric potential is 0.8 V,the current density reaches 200.1 mA/cm^(2),which is 2.2 times of that of the powder after high-temperature calcination.The internal resistance is 0.94117Ω·cm^(2)with good redox performance and OER catalytic activity.Laser heating can replace high-temperature calcination as an efficient preparation technology to stabilize the crystal structure of perovskite.

关 键 词：溶胶凝胶法 激光加热 钙钛矿 高温煅烧 电化学性能 

分 类 号：TQ132[化学工程—无机化工]