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Nano Research

, Volume 12, Issue 3, pp 643–650 | Cite as

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

  • Hui Yang
  • Joeseph Bright
  • Sujan Kasani
  • Peng Zheng
  • Terence Musho
  • Banglin Chen
  • Ling HuangEmail author
  • Nianqiang WuEmail author
Research Article

Abstract

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 nanorod array is formed by coating 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 electrons and holes out of the TiO2 nanorods. In addition, the MOF coating significantly improves the efficiency of charge injection at the photoanode/electrolyte interface. Introduction of Co(III) 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/cm2 at 1.23 V (vs. RHE), which is ~ 2.7 times the photocurrent achieved with bare TiO2 nanorod array under irradiation of an unfiltered 300 W Xe lamp with an output power density of 100 mW/cm2.

Keywords

metal-organic framework water-splitting p–n junction photoanode titanium dioxide 

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

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Hui Yang
    • 1
  • Joeseph Bright
    • 1
  • Sujan Kasani
    • 4
  • Peng Zheng
    • 1
  • Terence Musho
    • 1
  • Banglin Chen
    • 5
  • Ling Huang
    • 6
    Email author
  • Nianqiang Wu
    • 1
    • 2
    • 3
    Email author
  1. 1.Department of Mechanical and Aerospace EngineeringWest Virginia UniversityMorgantownUSA
  2. 2.C. Eugene Bennett Department of ChemistryWest Virginia UniversityMorgantownUSA
  3. 3.Department of Pharmaceutical ScienceWest Virginia UniversityMorgantownUSA
  4. 4.Lane Department of Computer Science and Electrical EngineeringWest Virginia UniversityMorgantownUSA
  5. 5.Department of ChemistryUniversity of Texas at San Antonio, One UTSA CircleSan AntonioUSA
  6. 6.Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)NanjingChina

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