Enhanced Oxygen Evolution Reaction Activity of Nanoporous SnO2/Fe2O3/IrO2 Thin Film Composite Electrodes with Ultralow Noble Metal Loading

Journal article
(Original article)


Publication Details

Author(s): Haschke S, Zhuo Y, Schlicht S, Barr M, Kloth R, Dufond ME, Santinacci L, Bachmann J
Journal: Advanced Materials Interfaces
Publisher: WILEY
Publication year: 2019
Volume: 6
Journal issue: 3
ISSN: 2196-7350


Abstract

A conductive SnO2 layer and small quantities of IrO2 surface cocatalyst enhance the catalytic efficiency of nanoporous Fe2O3 electrodes in the oxygen evolution reaction at neutral pH. Anodic alumina templates are therefore coated with thin layers of SnO2, Fe2O3, and IrO2 by atomic layer deposition. In the first step, the Fe2O3 electrode is modified with a conductive SnO2 layer and submitted to different postdeposition thermal treatments in order to maximize its catalytic performance. The combination of steady-state electrolysis, electrochemical impedance spectroscopy, X-ray crystallography, and X-ray photoelectron spectroscopy demonstrates that catalytic turnover and e(-) extraction are most efficient if both layers are amorphous in nature. In the second step, small quantities of IrO2 with extremely low iridium loading of 7.5 mu g cm(-2) are coated on the electrode surface. These electrodes reveal favorable long-term stability over at least 15 h and achieve maximized steady-state current densities of 0.57 +/- 0.05 mA cm(-2) at eta = 0.38 V and pH 7 (1.36 +/- 0.10 mA cm(-2) at eta = 0.48 V) in dark conditions. This architecture enables charge carrier separation and reduces the photoelectrochemical water oxidation onset by 300 mV with respect to pure Fe2O3 electrodes of identical geometry.


FAU Authors / FAU Editors

Bachmann, Julien Prof.
Lehrstuhl für Chemistry of thin film materials
Barr, Maissa Dr.
Lehrstuhl für Chemistry of thin film materials
Haschke, Sandra
Lehrstuhl für Chemistry of thin film materials
Kloth, Ricarda
Lehrstuhl für Anorganische und Allgemeine Chemie
Schlicht, Stefanie
Lehrstuhl für Chemistry of thin film materials
Zhuo, Ying
Lehrstuhl für Chemistry of thin film materials


External institutions with authors

Aix-Marseille University / Aix-Marseille Université


How to cite

APA:
Haschke, S., Zhuo, Y., Schlicht, S., Barr, M., Kloth, R., Dufond, M.E.,... Bachmann, J. (2019). Enhanced Oxygen Evolution Reaction Activity of Nanoporous SnO2/Fe2O3/IrO2 Thin Film Composite Electrodes with Ultralow Noble Metal Loading. Advanced Materials Interfaces, 6(3). https://dx.doi.org/10.1002/admi.201801432

MLA:
Haschke, Sandra, et al. "Enhanced Oxygen Evolution Reaction Activity of Nanoporous SnO2/Fe2O3/IrO2 Thin Film Composite Electrodes with Ultralow Noble Metal Loading." Advanced Materials Interfaces 6.3 (2019).

BibTeX: 

Last updated on 2019-03-04 at 12:08