Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201906670
Keywords
antimony-doped tin oxide microparticles; homogenous iridium coating; iridium oxide nanoparticles; supported OER catalyst; ultrasonic spray pyrolysis
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Funding
- German Federal Ministry of Education and Research (BMBF) within the Kopernikus Project P2X: Flexible use of renewable resources-research, validation, and implementation of Power-to-X concepts
- German Research Foundation [DFG SPP1613]
- e-Conversion Excellence cluster (DFG)
- research networks Solar Technologies Go Hybrid
- UMWELTnanoTECH (Free State of Bavaria)
- Center for NanoScience (CeNS)
- Fonds der chemischen Industrie
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A multistep synthesis procedure for the homogeneous coating of a complex porous conductive oxide with small Ir nanoparticles is introduced to obtain a highly active electrocatalyst for water oxidation. At first, inverse opal macroporous Sb doped SnO2 (ATO) microparticles with defined pore size, composition, and open-porous morphology are synthesized that reach a conductivity of approximate to 3.6 S cm(-1) and are further used as catalyst support. ATO-supported iridium catalysts with a controlled amount of active material are prepared by solvothermal reduction of an IrOx colloid in the presence of the porous ATO particles, whereby homogeneous coating of the complete outer and inner surface of the particles with nanodispersed metallic Ir is achieved. Thermal oxidation leads to the formation of ATO-supported IrO2 nanoparticles with a void volume fraction of approximate to 89% calculated for catalyst thin films based on scanning transmission electron microscope tomography data and microparticle size distribution. A remarkably low Ir bulk density of approximate to 0.08 g cm(-3) for this supported oxide catalyst architecture with 25 wt% Ir is determined. This highly efficient oxygen evolution reaction catalyst reaches a current density of 63 A g(Ir)(-1) at an overpotential of 300 mV versus reversible hydrogen electrode, significantly exceeding a commercial TiO2-supported IrO2 reference catalyst under the same measurement conditions.
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