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A Facile Surface Passivation of Hematite Photoanodes with Molybdate Overlayers for Efficient PEC Water Oxidation
Qi Zhang1,2, Quan-ping Wu*1, Yue Zhang1, Ji-tong Yan2, Song Xue2, Hong-yan Wang*2
1.Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechanical System, School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China;2.Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
Abstract:
α-Fe2O3 thin films have been synthesized and used as photoanodes for photo-electrochemical (PEC) water oxidation. Molybdate was introduced to mediate hematite thin films via two synthesis routes (namely in situin situ mediation and ex situ modification). Through the in situ mediation process, the morphology and film thickness could be changed significantly due to the addition of MoO42-, while for the ex situ modification, the PEC performance of the hematite has been greatly improved without changing the nanorod morphology. Various characterizations such as UV-Vis absorption, transmission electronic microscopy, scanning electronic microscopy, Mott-Schottky, electrochemical impedance spectroscopy were conducted and the PEC performances were investigated.
Key words:  Hematite film, Molybdate, Passivation, Water splitting, Photocurrent
FundProject:
钼酸根离子钝化层对氧化铁薄膜光电催化氧化水的性能影响研究
张 琦1,2, 武全萍*1, 张 月1, 闫纪同2, 薛 松2, 王红艳*2
1.天津理工大学机械工程学院,天津市先进机电系统设计与智能控制重点实验室,天津 300384;2.天津理工大学化学化工学院,天津市有机太阳能电池与光化学转换重点实验室,天津 300384
摘要:
本文研究了氧化铁(α-Fe2O3)薄膜光阳极的合成及其光电催化分解水产氧的性能. 在合成氧化铁过程中,采用原位和非原位方式引入钼酸根离子,调控氧化铁薄膜的生长模式和表面特性. 实验发现原位引入钼酸根离子会显著影响氧化铁薄膜的形貌以及厚度. 而非原位表面修饰钼酸根离子则会保持氧化铁的纳米棒形貌,并有效提高其光电催化分解水的性能. 文章通过紫外-可见吸收光谱,透射电子显微镜(TEM),扫描电子显微镜(SEM),莫特-肖特基测试(M-S),电化学阻抗(EIS)以及光电催化性能测试等手段对材料的结构和性能进行了研究.
关键词:  氧化铁薄膜,钼酸盐,钝化,水分解,光电流
DOI:10.1063/1674-0068/31/cjcp1806133
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