Highly conductive titania supported iridium oxide nanoparticles with low overall iridium density as OER catalyst for large-scale PEM electrolysis

被引:76
作者
Boehm, Daniel [1 ,2 ,3 ]
Beetz, Michael [1 ,2 ,7 ,8 ]
Gebauer, Christian [6 ]
Bernt, Maximilian [7 ,8 ]
Schroeter, Jonas [7 ,8 ]
Kornherr, Matthias [7 ,8 ]
Zoller, Florian [3 ]
Bein, Thomas [1 ,2 ]
Fattakhova-Rohlfing, Dina [3 ,4 ,5 ]
机构
[1] Ludwig Maximilians Univ Munchen, Dept Chem, Butenandtstr 5-13 E, D-81377 Munich, Germany
[2] Ludwig Maximilians Univ Munchen, Ctr NanoSci CeNS, Butenandtstr 5-13 E, D-81377 Munich, Germany
[3] Forschungszentrum Julich, Inst Energy & Climate Res IEK Mat Synth & Proc 1, Wilhelm Johnen Str, D-52425 Julich, Germany
[4] Univ Duisburg Essen, Fac Engn, Lotharstr 1, D-47057 Duisburg, Germany
[5] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, Lotharstr 1, D-47057 Duisburg, Germany
[6] Heraeus Deutschland GmbH & Co KG, Heraeusstr 12-14, D-63450 Hanau, Germany
[7] Tech Univ Munich, Dept Chem, Chair Tech Electrochem, D-85748 Garching, Germany
[8] Tech Univ Munich, Catalysis Res Ctr, D-85748 Garching, Germany
关键词
Supported OER catalyst; PEM electrolysis; Homogenous iridium coating; Iridium oxide nanoparticles; Titania support catalyst; OXYGEN EVOLUTION REACTION; HIGH-SURFACE-AREA; THERMALLY TREATED IRIDIUM; ANODIC-OXIDATION; PARTICLE-SIZE; IRO2; ELECTROCATALYSTS; STABILITY; EFFICIENT; PROTON;
D O I
10.1016/j.apmt.2021.101134
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To enable future large-scale generation of hydrogen via proton exchange membrane (PEM) electrolysis, utilization of scarce iridium-based catalysts required for the oxygen evolution reaction (OER) has to be significantly lowered. To address this question, the facile synthesis of a highly active TiO2 supported iridium oxide based OER catalyst with reduced noble metal content and an Ir-density of the catalyst powder as low as 0.05-0.08 g(Ir) cm(-3) is described in this work. A high surface area corrosion-resistant titania catalyst support homogeneously coated with a 1-2 nm thin layer of amorphous IrOOHx is oxidized in molten NaNO3 between 350-375 degrees C. This procedure allows for a controllable phase transformation and crystallization to form a layer of interconnected IrO2 nanoparticles of approximate to 2 nm on the surface of the TiO2 support. The increase in crystallinity is thereby accompanied by a significant increase in conductivity of up to 11 S cm(-1) for a 30 wt% Ir loaded catalyst. Oxidized samples further display a significantly increased stability with less detectable Ir dissolution under OER conditions. With a mass-based activity of 59 A g(-1) at an overpotential of 300 mV, the electrocatalytic activity is maintained at the level of the highly active amorphous IrOOHx phase used as precursor and outperforms it at higher current densities through the increased conductivity. MEA measurements with catalyst loadings of 0.2-0.3 mg cm(-2) further confirm the high catalytic activity and initial stability at industrially relevant current densities. The introduced synthesis approach therefore shows a path for the fabrication of novel highly active and atom-efficient oxide supported catalysts with complex nanostructures and thin homogenous nanoparticle coatings that allows a future large-scale application of PEM electrolysis technology without restrictions by the natural abundance of iridium. (C) 2021 Elsevier Ltd. All rights reserved.
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页数:15
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