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以阳极氧化法制备的TiO_2有序纳米管阵列为反应物和模板,采用微波水热法成功原位制备了BaTiO_3/TiO_2纳米管复合薄膜。利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)、X射线光电子能谱(XPS)等方法对复合薄膜的物相、形貌、尺寸及化学组成进行表征。利用电化学综合测试系统测量304不锈钢耦接微波水热不同时间制备薄膜后的电极电位、光电流密度和电化学阻抗谱(EIS)。结果表明,微波水热反应20 min制备了BaTiO_3/TiO_2纳米管结构,随着微波水热时间的延长,纳米管壁厚不断增加,管口内径不断减小,反应时间过长(60 min)会破坏纳米管形貌。相比耦接TiO_2纳米管薄膜的304不锈钢,耦接微波水热反应20min制备的复合薄膜的304不锈钢在白光照射下具有更负的电极电位(E=-500mV),更高的光电流密度(46μA/cm~2),更小的阻抗值(R_(ct)=552.6Ω·cm~2),这是由于BaTiO_3与TiO_2的协同效应减缓了光生电子-空穴的复合几率,提高了光量子效率,从而改善了对304不锈钢的光生阴极保护性能。
TiO 2 ordered nanotube arrays prepared by anodic oxidation were used as reactants and templates. The BaTiO 3 / TiO 2 nanotube composite films were successfully prepared in situ by microwave hydrothermal method. The phase, morphology, size and chemical composition of the composite films were characterized by XRD, FESEM and XPS. The electrode potential, photocurrent density and electrochemical impedance spectroscopy (EIS) of 304 stainless steel coupled microwave heating and heating at different time were measured by electrochemical integrated test system. The results showed that the structure of BaTiO 3 / TiO 2 nanotubes was prepared by microwave hydrothermal reaction for 20 min. With the prolongation of microwave hydrothermal time, the wall thickness of nanotubes increased continuously and the inner diameter of the nozzle decreased continuously. The reaction time was too long (60 min) Destroy nanotube morphology. Compared with 304 stainless steel coupled with TiO 2 nanotubes, 304 stainless steel with composite film prepared by hydrothermal reaction of microwave for 20 min had more negative electrode potentials (E = -500 mV) and higher photocurrent density ( 46μA / cm ~ 2) and smaller value of resistance (R ct = 552.6Ω · cm ~ 2). This is because the synergistic effect of BaTiO_3 and TiO_2 slows the recombination probability of photogenerated electron-hole and improves the photon quantum efficiency , Thereby improving the photocathode protection of 304 stainless steel.