Study about an assembly of iron(III) hexacyanoferrate(II) and α-Fe2O3 as a secondary photocell: Part 1. Synthesis, characterization and photoelectrochemical properties of FTO/α-Fe2O3/KFe[Fe(CN)6]3 electrode system

Víctor Rojas, Emilio Navarrete, Javier Román, Luis Ballesteros, Gustavo Cáceres, Romina Díaz, Ricardo Schrebler, Ricardo Córdova, Paula Grez, Rodrigo Henríquez, Ricardo E. Marotti, Enrique A. Dalchiele, Francisco Herrera, EDUARDO CARLO MUÑOZ CARTAGENA

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Abstract

This study addresses the synthesis and characterization of iron(III) hexacyanoferrate(II) (Prussian blue, PB) deposited on a semiconductor hematite electrode (α-Fe2O3). The formation of the Prussian blue/hematite interface was carried out by cyclic voltammetry. The modified electrode was morphologically characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), structurally by x-ray diffraction (XRD), and photoelectrochemically by cyclic voltammetry under polychromatic illumination. The structure of the electrode system shows a cauliflower type morphology, with the typical PB structure. The electrochemical characterization indicates an increase of the currents of the low- and high-spin iron systems of PB when the system is illuminated, indicating that photogenerated charge carriers are involved.

Original languageEnglish
Article number113913
JournalJournal of Electroanalytical Chemistry
Volume860
DOIs
StatePublished - 1 Mar 2020
Externally publishedYes

Keywords

  • Photoelectrochemistry
  • Prussian blue
  • α-FeO semiconductor

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