BaTiO3/SrTiO3复合薄膜的制备及其光电化学阴极保护性能
Preparation of BaTiO3/SrTiO3 composite film and its photoelectrochemical cathodic protection performance
庆达 1王建省 1苏新悦 1赵英娜 1曾雄丰1
作者信息
- 1. 华北理工大学 材料科学与工程学院,河北省无机非金属材料实验室,唐山 063210;河北省(唐山)陶瓷产业技术研究院,唐山 063007
- 折叠
摘要
提高光生载流子的分离效率是提高光电化学阴极保护性能的有效途径,为弥补SrTiO3 禁带宽度大、光生载流子分离效率低等缺点,通过两步超声喷雾热解工艺在氟掺杂氧化锡导电玻璃(FTO)上制备了BaTiO3/SrTiO3 复合薄膜.通过XRD、SEM、UV-vis DRS、PL对样品物相成分、表面形貌、光学性能等进行观测.随后以 304不锈钢(304 SS)为被保护金属,观测了BaTiO3/SrTiO3 复合薄膜遮蔽光条件下的光电化学阴极保护性能.其中BaTiO3/SrTiO3 的相对位置由Mott-Schottky曲线确定.结果表明:通过两步超声喷雾热解工艺制备得到的 BaTiO3/SrTiO3 复合薄膜,光吸收范围拓宽至 400 nm;BaTiO3/SrTiO3 复合薄膜相比于SrTiO3 薄膜,光吸收性能增强;光生载流子分离效率提高;在 3.5wt%NaCl溶液中,BaTiO3/SrTiO3 复合薄膜使 304 SS的开路电位负移至-0.38 V,负移程度约 230 mV,而纯SrTiO3 薄膜仅能负移 100 mV.其性能提升主要归因于BaTiO3 与SrTiO3 复合形成了异质结,促进了光生载流子的分离.
Abstract
Improving the separation efficiency of photogenerated carriers is an effective way to improve the protec-tion performance of photoelectrochemical cathode.In order to make up for the shortcomings of SrTiO3,such as large band gap and low separation efficiency of photogenerated carriers,BaTiO3/SrTiO3 composite films were pre-pared on fluorine-doped tin oxide conductive glass(FTO)by two-step ultrasonic spray pyrolysis process.The phase composition,surface morphology and optical properties of the samples were observed by XRD,SEM,UV-vis DRS and PL.Then,304 stainless steel(304 SS)was used as the protected metal,and the photoelectrochemical cathodic protection performance of BaTiO3/SrTiO3 composite film was observed under the condition of shading light.The relative position of BaTiO3/SrTiO3 is determined by Mott-Schottky curve.The results show that the light absorption range of BaTiO3/SrTiO3 composite films prepared by two-step ultrasonic spray pyrolysis process is broadened to 400 nm.Compared with SrTiO3 film,BaTiO3/SrTiO3 composite film has better light absorption performance.The separation efficiency of photo-generated carriers is improved.In 3.5wt%NaCl solution,BaTiO3/SrTiO3 composite film negatively shifts the open circuit potential of 304 SS to-0.38 V,with a negative shift degree of about 230 mV,while pure SrTiO3 film can only negatively shift by 100 mV.The performance improvement is mainly attributed to the heterojunction formed by BaTiO3 and SrTiO3,which promotes the separation of photogenerated carriers.
关键词
BaTiO3/SrTiO3/复合薄膜/超声喷雾热解/光电化学阴极保护Key words
BaTiO3/SrTiO3/composite film/ultrasonic spray pyrolysis/photoelectrochemical cathodic protection引用本文复制引用
基金项目
河北省自然科学基金钢铁联合基金(E2021209002)
唐山市科技局项目(21130211D)
唐山市科技局项目(22130215H)
出版年
2024
NETL
NSTL
万方数据