Deposition of FeOOH layers onto porous PbO2 by galvanic displacement and their use as electrocatalysts for oxygen evolution reaction

The galvanic displacement reaction between sacrificial PbO2 layers and Fe(II) ions has been carried out in mildly acid acetate solutions. The effect of experimental variables, like morphology of the PbO2 layers, solution pH, temperature and concentration of Fe(II) ions, has been investigated by comb...

Full description

Saved in:
Bibliographic Details
Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 880; p. 114844
Main Authors Comisso, Nicola, Armelao, Lidia, Cattarin, Sandro, Fasolin, Stefano, Mattarozzi, Luca, Musiani, Marco, Rancan, Marzio, Vázquez-Gómez, Lourdes, Verlato, Enrico
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.01.2021
Elsevier Science Ltd
Subjects
Anodes for OER
Diffusion
Electrocatalysts
Galvanic replacement
Gas bubble templated deposition
Lead oxides
Mixed oxides
Morphology
Oxygen evolution reactions
Porous electrodes
Transition metals
X ray photoelectron spectroscopy
Galvanic replacement
Porous electrodes
Mixed oxides
Diffusion
Gas bubble templated deposition
Anodes for OER
Online AccessGet full text

Cover

More Information
Summary:The galvanic displacement reaction between sacrificial PbO2 layers and Fe(II) ions has been carried out in mildly acid acetate solutions. The effect of experimental variables, like morphology of the PbO2 layers, solution pH, temperature and concentration of Fe(II) ions, has been investigated by combining electrochemical methods, SEM-EDS, XRD and XPS. The reaction between PbO2 and Fe(II) ions produced secondary dual layers, consisting of an inner amorphous FeOOH film and an outer crystalline γ-FeOOH deposit, respectively. This peculiar behavior was in contrast with analogous reactions involving other transition metal ions, which yielded only continuous amorphous secondary oxide layers. PbO2/FeOOH layers were tested as anodes for the oxygen evolution reaction in basic media. [Display omitted] •Porous FeOOH layers are prepared by oxide-oxide galvanic displacement reactions•Secondary deposits consist of inner amorphous and outer crystalline γ-FeOOH layers•FeOOH growth rate increases with pH and temperature, but is essentially independent of [Fe2+]•PbO2/FeOOH electrodes catalyze oxygen evolution reaction
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114844