Composite Indium Tin Oxide Nanofibers with Embedded Hematite Nanoparticles for Photoelectrochemical Water Splitting

Oren Elishav, David Stone, Anton Tsyganok, Swetha Jayanthi, David S. Ellis, Tamir Yeshurun, Itzhak I. Maor, Adar Levi, Vadim Beilin, Gennady E. Shter, Roie Yerushalmi, Avner Rothschild*, Uri Banin*, Gideon S. Grader*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Hematite is a classical photoanode material for photoelectrochemical water splitting due to its stability, performance, and low cost. However, the effect of particle size is still a question due to the charge transfer to the electrodes. In this work, we addressed this subject by the fabrication of a photoelectrode with hematite nanoparticles embedded in close contact with the electrode substrate. The nanoparticles were synthesized by a solvothermal method and colloidal stabilization with charged hydroxide molecules, and we were able to further use them to prepare electrodes for water photo-oxidation. Hematite nanoparticles were embedded within electrospun tin-doped indium oxide nanofibers. The fibrous layer acted as a current collector scaffold for the nanoparticles, supporting the effective transport of charge carriers. This method allows better contact of the nanoparticles with the substrate, and also, the fibrous scaffold increases the optical density of the photoelectrode. Electrodes based on nanofibers with embedded nanoparticles display significantly enhanced photoelectrochemical performance compared to their flat nanoparticle-based layer counterparts. This nanofiber architecture increases the photocurrent density and photon-to-current internal conversion efficiency by factors of 2 and 10, respectively.

Original languageAmerican English
Pages (from-to)41851-41860
Number of pages10
JournalACS applied materials & interfaces
Volume14
Issue number37
DOIs
StatePublished - 21 Sep 2022

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society.

Keywords

  • hematite
  • nanofibers
  • nanoparticles
  • photochemistry
  • water splitting

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