DOI: 10.1002/cssc.201402988. Iridium Oxide Coatings with Templated Porosity as Highly Active Oxygen Evolution Catalysts: Structure‐Activity Relationships

Iridium Oxide Coatings with Templated Porosity as Highly Active Oxygen Evolution Catalysts: Structure‐Activity Relationships

10.1002/cssc.201402988

Crossref journal-article

Wiley

ChemSusChem (311)

Abstract

AbstractIridium oxide is the catalytic material with the highest stability in the oxygen evolution reaction (OER) performed under acidic conditions. However, its high cost and limited availability demand that IrO2 is utilized as efficiently as possible. We report the synthesis and OER performance of highly active mesoporous IrO2 catalysts with optimized surface area, intrinsic activity, and pore accessibility. Catalytic layers with controlled pore size were obtained by soft‐templating with micelles formed from amphiphilic block copolymers poly(ethylene oxide)‐b‐poly(butadiene)‐b‐poly(ethylene oxide). A systematic study on the influence of the calcination temperature and film thickness on the morphology, phase composition, accessible surface area, and OER activity reveals that the catalytic performance is controlled by at least two independent factors, that is, accessible surface area and intrinsic activity per accessible site. Catalysts with lower crystallinity show higher intrinsic activity. The catalyst surface area increases linearly with film thickness. As a result of the templated mesopores, the pore surface remains fully active and accessible even for thick IrO2 films. Even the most active multilayer catalyst does not show signs of transport limitations at current densities as high as 75 mA cm−2.

Bibliography

Bernicke, M., Ortel, E., Reier, T., Bergmann, A., FerreiraâdeâAraujo, J., Strasser, P., & Kraehnert, R. (2015). Iridium Oxide Coatings with Templated Porosity as Highly Active Oxygen Evolution Catalysts: StructureâActivity Relationships. ChemSusChem, 8(11), 1908â1915. Portico.

Authors 7

Michael Bernicke (first)
Erik Ortel (additional)
Tobias Reier (additional)
Arno Bergmann (additional)
Jorge Ferreira de Araujo (additional)
Peter Strasser (additional)
Ralph Kraehnert (additional)

References 43 Referenced 123

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Dates

Type	When
Created	10 years, 3 months ago (May 8, 2015, 4:08 p.m.)
Deposited	2 years ago (Aug. 29, 2023, 7:40 a.m.)
Indexed	3 weeks, 6 days ago (Aug. 3, 2025, midnight)
Issued	10 years, 3 months ago (May 8, 2015)
Published	10 years, 3 months ago (May 8, 2015)
Published Online	10 years, 3 months ago (May 8, 2015)
Published Print	10 years, 2 months ago (June 8, 2015)

Funders 2

BMBF
Awards1
1. FKZ 03K3009
Einstein Stiftung Berlin 10.13039/501100006188
Region: Europe
gov (Local government)
Labels1
1. Einstein Foundation Berlin
Awards1
1. EJF-2011-95

BibTeX

@article{Bernicke_2015, title={Iridium Oxide Coatings with Templated Porosity as Highly Active Oxygen Evolution Catalysts: Structure‐Activity Relationships}, volume={8}, ISSN={1864-564X}, url={http://dx.doi.org/10.1002/cssc.201402988}, DOI={10.1002/cssc.201402988}, number={11}, journal={ChemSusChem}, publisher={Wiley}, author={Bernicke, Michael and Ortel, Erik and Reier, Tobias and Bergmann, Arno and Ferreira de Araujo, Jorge and Strasser, Peter and Kraehnert, Ralph}, year={2015}, month=may, pages={1908–1915} }

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