Cu-doped flower-like hematite nanostructures for efficient water splitting applications

Ermias Libnedengel Tsege, Timur Sh Atabaev, Md Ashraf Hossain, Dongyun Lee, Hyung Kook Kim, Yoon Hwae Hwang

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

This study reports the successful preparation of Cu-doped hematite (α-Fe2O3) flower-like nanostructures with different Cu concentrations on FTO glass substrates using a facile hydrothermal method. The Cu-doped α-Fe2O3 flower-like nanostructure combines the advantage of p-type doping with the feature of a flower-like architecture. The prepared nanostructure film was applied as a photocathode in a photoelectrochemical (PEC) water splitting experiment and achieved a significantly improved photocurrent density of −5.34 mA cm−2 at −0.6 V vs. reversible hydrogen electrode (RHE) for 1 mol% Cu doping. The obtained photocurrent is about 4.85 times higher than that of the pure α-Fe2O3 based photoelectrode. The incorporation of Cu into α-Fe2O3 results in a dramatic enhancement in the water splitting performance. The enhancement is gained through an improvement in light harvesting and charge carrier separation. The copper-modified α-Fe2O3 sample also exhibited an up shift in the conduction band edge potential, which is energetically favorable for the water reduction reaction. This result demonstrated high performance PEC water splitting as a potential route for the production of hydrogen gas using a single Cu-doped α-Fe2O3 photoelectrode without the need for other catalysts and hybrid structures.

Original languageEnglish
Pages (from-to)283-289
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume98
DOIs
Publication statusPublished - Nov 1 2016
Externally publishedYes

Keywords

  • Cu-doping
  • Hematite
  • Nanostructures
  • Photocathode
  • Water splitting

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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