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Mesoporous IrO2 Films Templated by PEO-PB-PEO Block-Copolymers: Self-Assembly, Crystallization Behavior, and Electrocatalytic Performance

Ortel, Erik, Reier, Tobias, Strasser, Peter, Kraehnert, Ralph·2011·Chemistry of Materials

Abstract

Synthesis of mesoporous iridium oxide films via soft templating and evaporation-induced self-assembly is demonstrated employing an amphiphilic triblock-copolymer PEO-PB-PEO. Films possess nanocrystalline walls and feature locally ordered pores of about 16 nm diameter. Analysis of the film properties by SEM, TEM, EDX, XPS, SAXS, XRD, and BET along the thermal treatment that succeeds dipcoating shows that the polymer template is removed by calcination between 200 and 300 °C, accompanied by uniaxial shrinkage of film and pore system perpendicular to the substrate. Treating the film in excess of 450 °C leads to further growth of crystallite size and loss of surface area progressing gradually with increasing calcination temperature. Templated IrO 2 films conditioned at 450 °C show substantially reduced electrocatalytic overpotentials (efficiency increases) for the oxygen evolution reaction (OER) compared to those of untemplated coatings. Pore templating thus enables direct control over surface catalytic properties of iridium oxide.

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Metadata

Authors
Ortel, E., Reier, T., Strasser, P., & Kraehnert, R.
Venue
Chemistry of Materials
Published
2011-06-06
Volume
23
Issue
13
Pages
3201-3209
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
OpenAlex
W2319498202
Cited by
171
References
2
FWCI
5.25
Type
journal article
Language
en
Open access
closed

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