Metal-organic framework coated titanium dioxide nanorod array p-n heterojunction photoanode for solar water-splitting  

作　　者：Hui Yang Joeseph Bright Sujan Kasani Peng Zheng Terence Musho Banglin Chen Ling Huang Nianqiang Wu 

机构地区：[1]Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506-6106, USA [2]C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506-6045, USA [3]Department of Pharmaceutical Science, West Virginia University, Morgantown, WV 26506-9530, USA [4]Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA [5]Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249-1604, USA [6]Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China

出　　处：《Nano Research》2019年第3期643-650,共8页纳米研究（英文版）

摘　　要：This paper presents a p-n heterojunction photoanode based on a p-type porphyrin metal-organic framework (MOF) thin film and an n-type rutile titanium dioxide nanorod array for photoelectrochemical water splitting. The TiO2@MOF core-shell n anorod array is formed by coati ng an 8 nm thick MOF layer on a vertically aligned TiO2 nanorod array scaffold via a layer-by-layer self-assembly method. This vertically aligned core-shell nanorod array enables a long optical path length but a short path length for extraction of photogenerated minority charge carriers (holes) from TiO2 to the electrolyte. A p-n junction is formed between TiO2 and MOF, which improves the extraction of photogenerated electr ons and holes out of the TiO2 nano rods. In additi on, the MOF coati ng sign ificantly improves the efficie ncy of charge in jecti on at the photoanode/electrolyte interface. Introduction of Co(lll) into the MOF layer further enhances the charge extraction in the photoanode and improves the charge injection efficiency. As a result, the photoelectrochemical cell with the TiO2@Co-MOF nanorod array photoanode exhibits a photocurrent density of 2.93 mA/cm^2 at 1.23 V (vs. RHE), which is ~ 2.7 times the photocurrent achieved with bare T1O2 nanorod array under irradiation of an unfiltered 300 W Xe lamp with an output power density of 100 mW/cm^2.

关 键 词：METAL-ORGANIC framework WATER-SPLITTING p-n junction PHOTOANODE titanium dioxide 

分 类 号：O4[理学—物理]