A5085147145- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- Catalysis and Hydrodesulfurization Studies
- Hybrid Renewable Energy Systems
- Semiconductor materials and devices
- Catalytic Processes in Materials Science
- Membrane-based Ion Separation Techniques
- Advancements in Solid Oxide Fuel Cells
Forschungszentrum Jülich
2021-2025
Friedrich-Alexander-Universität Erlangen-Nürnberg
2022-2025
Helmholtz Institute Erlangen-Nürnberg
2022-2025
The electrochemical activity of modern Fe-N-C electrocatalysts in alkaline media is on par with that platinum. For successful application fuel cells (FCs), however, also high durability and longevity must be demonstrated. Currently, a limited understanding degradation pathways, especially under operando conditions, hinders the design synthesis simultaneously active stable electrocatalysts. In this work, using gas diffusion electrode half-cell coupled inductively plasma mass spectrometry...
ADVERTISEMENT RETURN TO ISSUEPREVEnergy FocusNEXTBenchmarking Fuel Cell Electrocatalysts Using Gas Diffusion Electrodes: Inter-lab Comparison and Best PracticesKonrad Ehelebe*Konrad EhelebeHelmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Cauerstrasse 1, 91058 Erlangen, GermanyDepartment of Chemical Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Germany*[email protected]More by Konrad...
Fe cations produced during the reduction of O 2 on Fe–N–C materials transform into Fe-oxides due to a local increase in pH.
Fe–N–C catalysts are considered an earth-abundant alternative to Pt in cathodes of anion exchange membrane fuel cells, although their stability still requires improvement for further commercialization. The degradation during both load cycles and start–stop events must be understood mitigated minimize system costs. Several approaches have recently been proposed improve the durability Fe active species oxygen reduction reaction acidic media. On other hand, knowledge cells remains scarce. In...
Abstract In recent years, gas diffusion electrode (GDE) half-cell setups have attracted increasing attention, bridging the gap between fundamental and applied fuel cell research. They allow quick reliable evaluation of catalyst layers provide a unique possibility to screen different electrocatalysts at close real experimental conditions. However, benchmarking electrocatalysts’ intrinsic activity stability is impossible without knowing their electrochemical active surface area (ECSA). this...
Fe-N-C electrocatalysts demonstrate high potential in catalyzing oxygen reduction reaction (ORR) polymer electrolyte fuel cells, yet the bottleneck for their application is moderate stabilities. In our previous work,...
Atomic Fe in N-doped C (Fe-N-C) catalysts provide the most promising non-precious metal O2 reduction activity at cathodes of proton exchange membrane fuel cells. However, one biggest remaining challenges to address towards their implementation cells is limited durability. demetallation has been suggested as primary initial degradation mechanism. fate under different operating conditions varies. Here, we monitor operando dissolution a highly porous and >50% FeNx electrochemical utilization...
Energy storage and conversion occur through the manipulation of molecular bonds, catalyzed at electrified interfaces between an ion conductor electrocatalyst material within electrochemical reactors like hydrogen fuel cells or water electrolysers. Nanostructured electrode materials are essential for minimizing energy losses maximizing atom efficiency in these reactions. They provide significant advantages atomic dispersion, leading to enhanced performance benefits. The rapid efficient...
Durability and degradation are in the focus of modern electrocatalysis research. Before moving to real applications, e.g. fuel cells transportation or water electrolyzers for production green hydrogen, novel electrocatalytic materials must prove acceptable stability, but “ how test stability electrocatalysts ”? In relatively mature proton exchange membrane cell (PEMFC) research, is evaluated using various accelerated stress tests (ASTs). Unfortunately, even most studied Pt/C...
One of the most promising candidates to replace platinum group metal catalysts for oxygen reduction reaction (ORR) in fuel cells (FCs) is sub-class iron-nitrogen-carbon (Fe-N-C) catalysts. However, Fe-N-C materials considerably suffer from varied degradation mechanisms. [1-2] Compared FC operating conditions, start/stop events where cathodes experience anodic potential may be more damaging due carbon corrosion phenomenon. [3] The correlation between and Fe dissolution rates has been reported...
Fe-N-C catalysts are regularly proposed as promising earth-abundant and cheap replacing platinum group metal for fuel cells (FCs). Besides the activity, especially stability of those materials remains challenging. It was found that electrochemical activity durability superior in alkaline compared to acidic media, [1-3] yet most their degradation studies done media. [4-9] Moreover, although these systematic works, discrepancies results from aqueous model systems (AMS) [5,6] FC testing [7-9]...
Abstract The electrochemical activity of modern Fe-N-C electrocatalysts in alkaline media is on par with that platinum. For successful application fuel cells, however, also high durability and longevity must be demonstrated. Currently, design synthesis simultaneously active stable platinum group metal-free hindered by a limited understanding degradation, especially under operando conditions. In this work, using gas diffusion electrode half-cell coupled inductively plasma mass spectrometry...