Matthias Breitwieser
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View article: Reducing the PFAS‐Content in Fuel Cells: Novel Fluorine‐Free Gas Diffusion Layers for Hydrocarbon‐based Catalyst Coated Membranes
Reducing the PFAS‐Content in Fuel Cells: Novel Fluorine‐Free Gas Diffusion Layers for Hydrocarbon‐based Catalyst Coated Membranes Open
State‐of‐the‐art fuel cell components currently use per‐ and polyfluoroalkyl substances, such as polytetrafluoroethylene in gas diffusion layers (GDLs) and perfluorosulfonic acid (PFSA) ionomers in catalyst layers and membranes. In this st…
View article: Self‐Standing Fluorine‐Free Anode Microporous Layers Enabling Improved Hot and Dry Operation of Fully Hydrocarbon Proton‐Exchange Membrane Fuel Cells
Self‐Standing Fluorine‐Free Anode Microporous Layers Enabling Improved Hot and Dry Operation of Fully Hydrocarbon Proton‐Exchange Membrane Fuel Cells Open
Optimizing fuel cells for hot and dry conditions is crucial for heavy‐duty vehicle applications. This study focuses on enhancing gas diffusion layers (GDLs) to improve water management and performance of hydrocarbon (HC) catalyst‐coated me…
View article: Advanced Mycelium Skins for Sustainable Electronics
Advanced Mycelium Skins for Sustainable Electronics Open
Developing sustainable substrates for electronics is key to reduce the global reliance on fossil‐based synthetic polymers. Mycelium‐based materials are emerging as promising alternatives as they up‐cycle agricultural wastes and offer biode…
View article: Brennstoffzellen der nächsten Generation
Brennstoffzellen der nächsten Generation Open
Zusammenfassung Brennstoffzellen lassen sich in Hoch‐ und Niedertemperaturtypen aufteilen. Letztere vertragen schnelle Lastwechsel und eignen sich daher für den mobilen Bereich. Ihr Herzstück ist die Membran‐Elektroden‐Einheit. Die Membran…
View article: Pt/C catalysts synthesized in a commercial particle atomic layer deposition system enabling improved durability in fuel cells
Pt/C catalysts synthesized in a commercial particle atomic layer deposition system enabling improved durability in fuel cells Open
Pt/Cs synthesized via particle ALD demonstrate increased PEM fuel cell durability over 30 000 cycles of Pt dissolution testing, attributed to their narrow Pt size distribution and high Pt dispersity.
View article: 30 μm Thin Anode Gas Diffusion Layers for Optimized PEM Fuel Cell Operation at 120 °C and Low Relative Humidity
30 μm Thin Anode Gas Diffusion Layers for Optimized PEM Fuel Cell Operation at 120 °C and Low Relative Humidity Open
Achieving higher temperature operation above 100 °C, while increasing the volumetric power density are key targets in current fuel cell development. In this work, a novel type of polyvinylidene fluoride and graphite based microporous film …
View article: A Comparative Study of Conditioning Methods for Hydrocarbon‐Based Proton‐Exchange Membrane Fuel Cells for Improved Performance
A Comparative Study of Conditioning Methods for Hydrocarbon‐Based Proton‐Exchange Membrane Fuel Cells for Improved Performance Open
Recent advances in developing hydrocarbon‐based proton‐exchange membrane fuel cells have focused on optimizing materials. Voltage recovery (VR) has shown notable improvements for perfluorosulfonic acid‐based fuel cells. This study is the f…
View article: Toward Scalable Production: Catalyst‐Coated Membranes (CCMs) for Anion‐Exchange Membrane Water Electrolysis via Direct Bar Coating (Adv. Sustainable Syst. 2/2023)
Toward Scalable Production: Catalyst‐Coated Membranes (CCMs) for Anion‐Exchange Membrane Water Electrolysis via Direct Bar Coating (Adv. Sustainable Syst. 2/2023) Open
Direct Catalyst Coating In article 2200332, Severin Vierrath and co-workers demonstrate the fabrication process of the anion-exchange membrane water electrolyzer cells in a simplified way. The catalyst layers (black) are directly deposited…
View article: Alternative and facile production pathway towards obtaining high surface area PtCo/C intermetallic catalysts for improved PEM fuel cell performance
Alternative and facile production pathway towards obtaining high surface area PtCo/C intermetallic catalysts for improved PEM fuel cell performance Open
A novel PtCo/C based PEMFC electrocatalyst was investigated in real fuel cells under application-relevant conditions. The corresponding MEAs show superior performance compared to reference materials due to more suitable nanoparticle sizes.
View article: Toward Scalable Production: Catalyst‐Coated Membranes (CCMs) for Anion‐Exchange Membrane Water Electrolysis via Direct Bar Coating
Toward Scalable Production: Catalyst‐Coated Membranes (CCMs) for Anion‐Exchange Membrane Water Electrolysis via Direct Bar Coating Open
Direct catalyst coating of membranes is an obvious membrane‐electrode assembly (MEA) fabrication approach. Nevertheless, it bears significant challenges related to excessive swelling of the wetted membranes and catalyst layers during coati…
View article: High-resolution neutron imaging of salt precipitation and water transport in zero-gap CO2 electrolysis
High-resolution neutron imaging of salt precipitation and water transport in zero-gap CO2 electrolysis Open
The electrochemical reduction of CO 2 is a pivotal technology for the defossilization of the chemical industry. Although pilot-scale electrolyzers exist, water management and salt precipitation remain a major hurdle to long-term operation.…
View article: Alternative and facile production pathway towards obtaining high surface area PtCo/C intermetallic catalysts for improved PEM fuel cell performance
Alternative and facile production pathway towards obtaining high surface area PtCo/C intermetallic catalysts for improved PEM fuel cell performance Open
The design of catalysts with stable and finely dispersed platinum or platinum alloy nanoparticles on the carbon support is key in controlling the performance of proton exchange membrane (PEM) fuel cells. In the present work, an intermetall…
View article: High-resolution neutron imaging of carbonate precipitation and water transport in zero-gap CO2 electrolysis
High-resolution neutron imaging of carbonate precipitation and water transport in zero-gap CO2 electrolysis Open
The electrochemical reduction of CO 2 is a pivotal technology for the defossilization of the chemical industry. Although first pilot-scale electrolyzers exist, water management and salt precipitation remain a major hurdle to long-term oper…
View article: Methods— A Simple Method to Measure In-Plane Electrical Resistance of PEM Fuel Cell and Electrolyzer Catalyst Layers
Methods— A Simple Method to Measure In-Plane Electrical Resistance of PEM Fuel Cell and Electrolyzer Catalyst Layers Open
Optimizing the catalyst layer of polymer electrolyte membrane fuel cells and water electrolyzers requires a good understanding of its properties. The in-plane electrical resistance of the catalyst layer is a key property, which impacts the…
View article: PtCo/C catalysts with narrow particle size distribution improve high current density operation in PEM fuel cells
PtCo/C catalysts with narrow particle size distribution improve high current density operation in PEM fuel cells Open
The design of catalysts with stable and finely dispersed platinum on the carbon support is key in controlling the performance of fuel cells. In the present work, an intermetallic PtCo/C catalyst with a narrow particle size distribution syn…
View article: Fully Hydrocarbon Membrane Electrode Assemblies for Proton Exchange Membrane Fuel Cells and Electrolyzers: An Engineering Perspective
Fully Hydrocarbon Membrane Electrode Assemblies for Proton Exchange Membrane Fuel Cells and Electrolyzers: An Engineering Perspective Open
Perfluorinated‐sulfonic‐acid‐based ionomers (PFSAs) are still the material of choice for electrochemical energy devices such as proton‐exchange membrane fuel cells or water electrolyzers. However, PFSAs show significant drawbacks ranging f…
View article: Improving the efficiency of fully hydrocarbon-based proton-exchange membrane fuel cells by ionomer content gradients in cathode catalyst layers
Improving the efficiency of fully hydrocarbon-based proton-exchange membrane fuel cells by ionomer content gradients in cathode catalyst layers Open
The optimized hydrocarbon catalyst layer enables high performance in higher potentials (0.7 V) and peak power density under hot and dry operation conditions.
View article: Water management in anion-exchange membrane water electrolyzers under dry cathode operation
Water management in anion-exchange membrane water electrolyzers under dry cathode operation Open
Dry cathode operation is a desired operation mode in anion-exchange membrane water electrolyzers, but water management is crucial. This is visualized using high-resolution neutron radiography and the ion-exchange capacity of the cathode io…
View article: Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries
Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries Open
Cycling behaviour of Aemion™ (50 μm), Aemion+™ (50 μm), Aemion+™ (15 μm) and Nafion® 212 (50 μm) at 100 mA cm−2. (a) Coulombic efficiency, (b) energy efficiency and (c) membrane resistance.
View article: Hydrocarbon-based Pemion™ proton exchange membrane fuel cells with state-of-the-art performance
Hydrocarbon-based Pemion™ proton exchange membrane fuel cells with state-of-the-art performance Open
Our fully hydrocarbon fuel cells comprising Pemion™ as cation exchange material and PtCo as cathode catalyst exceed previous literature landmarks by a factor of nearly two, reaching the state-of-the-art performance.
View article: The effect of ionomer content in catalyst layers in anion-exchange membrane water electrolyzers prepared with reinforced membranes (Aemion+™)
The effect of ionomer content in catalyst layers in anion-exchange membrane water electrolyzers prepared with reinforced membranes (Aemion+™) Open
Anion-exchange membrane water electrolyzers (AEMWEs) are prepared as catalyst-coated membranes using varying amounts of ionomer in the catalyst layers.
View article: Rapid wet-chemical oxidative activation of graphite felt electrodes for vanadium redox flow batteries
Rapid wet-chemical oxidative activation of graphite felt electrodes for vanadium redox flow batteries Open
Schematic diagram of the K-GF fabrication process. Step 1: deposition of MnO x layers onto the P-GF electrode surface using acidified KMnO 4 solutions. Step 2: removal of MnO x layers using an acidified H 2 O 2 solution to produce the K-GF…
View article: Efficient and Stable Low Iridium Loaded Anodes for PEM Water Electrolysis Made Possible by Nanofiber Interlayers
Efficient and Stable Low Iridium Loaded Anodes for PEM Water Electrolysis Made Possible by Nanofiber Interlayers Open
Significant reduction of the precious metal catalyst loading is one of the key challenges for the commercialization of proton-exchange membrane water electrolyzers. In this work we combine IrOx nanofibers with a conventional nanoparticle-b…
View article: Water Electrolyzers: All‐Hydrocarbon MEA for PEM Water Electrolysis Combining Low Hydrogen Crossover and High Efficiency (Adv. Energy Mater. 14/2020)
Water Electrolyzers: All‐Hydrocarbon MEA for PEM Water Electrolysis Combining Low Hydrogen Crossover and High Efficiency (Adv. Energy Mater. 14/2020) Open
In article number 1903995, Klaus-Dieter Kreuer, Severin Vierrath and co-workers report the fabrication of sulfonated poly(phenylene sulfone) (sPPS) based water electrolyzers. The unique transport properties of sPPS allow such fluorine-free…
View article: All‐Hydrocarbon MEA for PEM Water Electrolysis Combining Low Hydrogen Crossover and High Efficiency
All‐Hydrocarbon MEA for PEM Water Electrolysis Combining Low Hydrogen Crossover and High Efficiency Open
Hydrocarbon ionomers bear the potential to significantly lower the material cost and increase the efficiency of proton‐exchange membrane water electrolyzers (PEMWE). However, no fully hydrocarbon membrane electrode assembly (MEA) with a pe…
View article: Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder Open
Partial substitution of the Nafion binder with PEDOT:PSS resulted in higher efficiency of proton exchange membrane water electrolyzers thanks to the improved in-plane electrical conductivity in the electrode.
View article: Direct Drop-on-Demand Printing of Molten Solder Bumps on ENIG Finishing at Ambient Conditions Through StarJet Technology
Direct Drop-on-Demand Printing of Molten Solder Bumps on ENIG Finishing at Ambient Conditions Through StarJet Technology Open
In this paper, we report on a detailed experimental study carried out with the StarJet technology to investigate the mechanical adhesion properties of directly printed solder bumps on electroless nickel immersion gold (ENIG) plated PCB boa…
View article: Improving the water management in anion-exchange membrane fuel cells <i>via</i> ultra-thin, directly deposited solid polymer electrolyte
Improving the water management in anion-exchange membrane fuel cells <i>via</i> ultra-thin, directly deposited solid polymer electrolyte Open
Thin ionomer membranes are considered key to achieve high performances in anion exchange membrane fuel cells, as well as high performance robustness towards changes in relative humidity.
View article: Towards 3D-lithium ion microbatteries based on silicon/graphite blend anodes using a dispenser printing technique
Towards 3D-lithium ion microbatteries based on silicon/graphite blend anodes using a dispenser printing technique Open
Silicon/carbon–graphite blend slurries designed for 3D-dispenser printed lithium ion microbatteries systematically characterized by rheological and electrochemical methods.
View article: Directly coated membrane electrode assemblies for proton exchange membrane water electrolysis
Directly coated membrane electrode assemblies for proton exchange membrane water electrolysis Open
We present a novel membrane electrode assembly (MEA) fabrication method for proton exchange membrane water electrolysis (PEMWE). Inspired by previous work on PEM fuel cells (PEMFCs), we fabricated PEMWE-MEAs via direct membrane deposition …