Composition-dependent optical and photoelectrochemical behavior of antimony oxide iodides

Altantuya Ochirkhuyag, Ildiko Y. Tóth, Attila Kormanyos, Csaba Janaky, Z. Kónya

Research output: Contribution to journalArticle

Abstract

The ongoing search for new photoelectrode materials generated interest toward semiconductors containing multiple anions. In this work, three different antimony oxide iodides (Sb 3 O 4 I, Sb 8 O 11 I 2 , and Sb 5 O 7 I) were synthesized by anhydrous synthesis. Scanning electron microscopy revealed mainly needle-shaped particles for Sb 3 O 4 I, elongated plate-shaped ones for Sb 8 O 11 I 2 and wellcrystallized hexagonal particles for Sb 5 O 7 I. The isoelectric point of the antimony oxide iodides (pH∼3) was independent of the chemical composition. With increasing pH particles became negatively charged to different extents, depending on the relative amount of oxygen in the samples, through the presence of =Sb-O-surface functional groups. The optical properties were heavily affected by the composition as well: bandgap energies related to the direct transitions in Sb 3 O 4 I, Sb 8 O 11 I 2 , and Sb 5 O 7 I were 2.16 and 2.74 eV, 2.85 eV, and 3.25 eV, respectively. Photoelectrochemical analysis proved that all samples behave as n-type semiconductors, but the performance in water oxidation showed large variation for the different compositions. The band energy diagram was constructed for all compounds and the composition dependent optoelectronic properties were rationalized on this basis.

Original languageEnglish
Pages (from-to)H3202-H3207
JournalJournal of the Electrochemical Society
Volume166
Issue number5
DOIs
Publication statusPublished - Jan 1 2019

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Antimony
Iodides
Oxides
Chemical analysis
Semiconductor materials
Electron transitions
Needles
Optoelectronic devices
Band structure
Functional groups
Anions
Energy gap
Negative ions
Optical properties
Oxygen
Oxidation
Scanning electron microscopy
antimony oxide
Water

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Composition-dependent optical and photoelectrochemical behavior of antimony oxide iodides. / Ochirkhuyag, Altantuya; Tóth, Ildiko Y.; Kormanyos, Attila; Janaky, Csaba; Kónya, Z.

In: Journal of the Electrochemical Society, Vol. 166, No. 5, 01.01.2019, p. H3202-H3207.

Research output: Contribution to journalArticle

Ochirkhuyag, Altantuya ; Tóth, Ildiko Y. ; Kormanyos, Attila ; Janaky, Csaba ; Kónya, Z. / Composition-dependent optical and photoelectrochemical behavior of antimony oxide iodides. In: Journal of the Electrochemical Society. 2019 ; Vol. 166, No. 5. pp. H3202-H3207.
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