ORCID Profile
0000-0002-4248-0431
Current Organisations
Forschungszentrum Jülich GmbH
,
Friedrich-Alexander-Universität Erlangen-Nürnberg
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Publications
Investigating the Real Time Dissolution of Mg Using Online Analysis by ICP-MS
Publisher: The Electrochemical Society
Date: 2014
DOI: 10.1149/2.064403JES
Electrifying model catalysts for understanding electrocatalytic reactions in liquid electrolytes
Publisher: Springer Science and Business Media LLC
Date: 04-06-2018
DOI: 10.1038/S41563-018-0088-3
Abstract: Electrocatalysis is at the heart of our future transition to a renewable energy system. Most energy storage and conversion technologies for renewables rely on electrocatalytic processes and, with increasing availability of cheap electrical energy from renewables, chemical production will witness electrification in the near future
The pH Dependence of Magnesium Dissolution and Hydrogen Evolution during Anodic Polarization
Publisher: The Electrochemical Society
Date: 2015
DOI: 10.1149/2.0621507JES
Degradation of iridium oxides via oxygen evolution from the lattice: correlating atomic scale structure with reaction mechanisms
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EE01872G
Abstract: Combination of atom probe tomography, isotope-labelling and online electrochemical mass spectrometry provides direct correlation of atomic scale structure of Ir oxide catalysts with the mechanism of oxygen formation from the lattice atoms.
Atomic-scale insights into surface species of electrocatalysts in three dimensions
Publisher: Springer Science and Business Media LLC
Date: 26-03-2018
Stabilization of an iridium oxygen evolution catalyst by titanium oxides
Publisher: IOP Publishing
Date: 31-03-2021
Abstract: The anodic oxygen evolution reaction (OER) has significant importance in many electrochemical technologies. In proton exchange membrane water electrolyzers it plays a pivotal role for electrochemical energy conversion, yet sluggish kinetics and the corrosive environment during operation still compel significant advances in electrode materials to enable a widespread application. Up-to-date Iridium is known as the best catalyst material for the OER in acidic media due to its relatively high activity and long-term stability. However, scarcity of iridium drives the development of strategies for its efficient utilization. One promising way would be the formation of mixtures in which the noble catalyst element is dispersed in the non-noble matrix of more stable metals or metal oxides. A promising valve metal oxide is TiO x , yet the degree to which performance can be optimized by composition is still unresolved. Thus, using a scanning flow cell connected to an inductively coupled plasma mass spectrometer, we examined the activity and stability for the OER of an oxidized Ir–Ti thin film material library covering the composition range from 20–70 at.% of Ir. We find that regardless of the composition the rate of Ir dissolution is observed to be lower than that of thermally prepared IrO 2 . Moreover, mixtures containing at least 50 at.% of Ir exhibit reactivity comparable to IrO 2 . Their superior performance is discussed with complementary information obtained from atomic scale and electronic structure analysis using atom probe tomography and x-ray photoelectron spectroscopy. Overall, our data shows that Ir–Ti mixtures can be promising OER catalysts with both high activity and high stability.
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Related Funding Activities
No related grants have been discovered for Karl Mayrhofer.