A5046001090- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advancements in Solid Oxide Fuel Cells
- Advanced Battery Technologies Research
- Membrane-based Ion Separation Techniques
- Lattice Boltzmann Simulation Studies
- Electrochemical Analysis and Applications
- Hybrid Renewable Energy Systems
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- Electrohydrodynamics and Fluid Dynamics
- Membrane Separation and Gas Transport
- Supercapacitor Materials and Fabrication
- Enhanced Oil Recovery Techniques
- Heat and Mass Transfer in Porous Media
- Catalysis and Hydrodesulfurization Studies
- Wind Energy Research and Development
- Nanopore and Nanochannel Transport Studies
- Advancements in Battery Materials
- Advanced Combustion Engine Technologies
- Biodiesel Production and Applications
- Advanced Control Systems Optimization
- Integrated Energy Systems Optimization
- Lubricants and Their Additives
Universidad Carlos III de Madrid
2015-2024
Lawrence Berkeley National Laboratory
2019-2020
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2017
Proton exchange membrane water electrolyzers (PEMWEs) have experienced a renaissance as eco-friendly devices for the storage of renewable energy surpluses. However, scarce attention paid to green hydrogen production in last century demands optimization make it an affordable and reliable technology. In this work, 1D multi-phase, non-isothermal model PEMWE is presented, which accounts complete description mass, charge heat transport. The predictions show good agreement with previous...
A novel hybrid continuum/discrete model is presented to analyze the performance of a polymer electrolyte membrane fuel cell (PEMFC) at rib/channel scale. Liquid water transport modeled with continuum formulation in channel and discrete pore-network-like gas diffusion layer (GDL), microporous (MPL) catalyst (CL). The remaining variables are by fully heterogeneous effective properties. This modeling approach provides more realistic two-phase description compared conventional macroscopic...
POREnet, a novel approach to model effective properties of thin porous media, TPM, is presented. The methodology allows the extraction local property tensors by volume averaging from discrete pore networks, PNs, built on tessellated continuum space TPM. gradient theorem used describe 3D transport in bulk space, providing an appropriate metric normalize network fluxes. Implemented trasport include diffusivity, permeability, solid-phase conductivity, and entry capillary pressure contact angle...
This paper presents a 2D, fully coupled and comprehensive transient model that accounts for micro-structural features of various cell layers. The benefits from state the art sub-models reaction kinetics incorporates polymer relaxation dynamics. Furthermore, mixed wettability is utilized to simulate two phase conditions in porous validated with experimental data under conditions. A simulation study presented investigate impact operating temperature relative humidity on response. effects...
Electrochemical flow reactors are increasingly relevant platforms in emerging sustainable energy conversion and storage technologies. As a prominent example, redox batteries, well-suited technology for large if the costs can be significantly reduced, leverage electrochemical as power converting units. Within reactor, field geometry determines electrolyte pumping required, mass transport rates, overall cell performance. However, current designs inspired by fuel technologies but have not been...
At the core of redox flow reactors, design field geometry –which distributes liquid electrolyte through porous electrodes– and electrode microstructure provides surfaces for electrochemical reactions– determines performance system. To date, these two components have been engineered in isolation their interdependence, although critical, is largely overlooked. Here, we systematically investigate interaction between state-of-the-art microstructures (a paper a cloth) prevailing geometries (flow...
Next-generation polymer electrolyte fuel cells (PEFCs) require an integral design of the porous structure electrodes at different scales to improve performance and enlarge durability while reducing cost. One today’s biggest challenges is stable, high-performance operation low Pt loading due detrimental effect local oxygen transport resistance caused by ionomer around catalyst sites. Hindered arises from sluggish kinetics reaction environment, that comprises adsorption (wet) interfaces,...
A model for the cathode catalyst layer (CL) is presented, which validated with previous experimental data in terms of both performance and oxygen transport resistance. The includes a 1D macroscopic description proton, electron across CL thickness, locally coupled to microscopic that describes toward Pt sites. Oxygen from channel ionic membrane are incorporated through integral boundary conditions. complemented effective electrochemical properties extracted multiple works. results show...
A parametric analysis is presented using a previously validated 1D model for cathode catalyst layer (CL). The results show that maximum power density at low Pt loading can be maximized with relatively thin CLs (thickness ∼ 2 μ m) featuring high carbon volume fraction (low ionomer-to-carbon weight ratio, I/C) compared to CLs. shift of the optimal (I/C ratio) caused by dominant role local oxygen transport resistance loading, which lowered reduction average ionomer film thickness (better...
The design of proton-exchange membranes (PEMs) for high-performance, durable fuel cells and related electrochemical devices requires a delicate balance between high ion-exchange capacity proton conductivity, while ensuring robust mechanical properties preserving dimensional, chemical thermal stability. In addition, low species crossover is desirable to reduce hydrogen peroxide formation. Ionomers used in PEMs can be classified into two main groups: (i) perfluorosulfonic acid (PFSA) polymers,...
Abstract Efficient evacuation of water generated by oxygen reduction reaction is necessary to increase catalyst utilization in polymer electrolyte membrane Fuel Cells . However, analysis two‐phase transport challenged the wide range pore sizes present electrode assembly (MEA), varying from 10–100 nm layer (CL), 10–1000 microporous (MPL) and 10 μ m gas diffusion (GDL). In this work, a novel multiscale invasion‐percolation model accounting for cathode CL, MPL GDL presented. Saturation...
Polymer electrolyte fuel cells (PEFCs) have demonstrated great potential in heavy-duty vehicles (HDVs) due to their unique scalability and smaller additional weight penalty for a longer driving range. To enable the deployment of HDVs, an increased durability platinum (Pt), which is catalyst used PEFCs, understanding degradation mechanism are top priorities. In this study, different configurations cracks were introduced into microporous layer (MPL) membrane electrode assemblies (MEAs)...
With the growing use of X-ray computed tomography (X-ray CT) datasets for modelling transport properties, comes need to define representative elementary volume (REV) if considering three dimensions or area (REA) two dimensions. The resolution used imaging must be suited features interest in sample and region-of-interest sufficiently large capture key information. Polymer electrolyte fuel cells have a hierarchical structure, with materials spanning multiple length scales. work presented here...