A5037833614- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advancements in Solid Oxide Fuel Cells
- Advanced battery technologies research
- Advanced Battery Technologies Research
- Conducting polymers and applications
- Hybrid Renewable Energy Systems
- Electric and Hybrid Vehicle Technologies
- Membrane-based Ion Separation Techniques
- Spacecraft and Cryogenic Technologies
- Analytical Chemistry and Sensors
- CO2 Reduction Techniques and Catalysts
- Electric Vehicles and Infrastructure
- Smart Grid Energy Management
- Environmental Policies and Emissions
- Real-time simulation and control systems
- solar cell performance optimization
- Optimal Power Flow Distribution
- Catalysis and Hydrodesulfurization Studies
- Power System Reliability and Maintenance
- Climate Change and Sustainable Development
- Catalysts for Methane Reforming
- Anodic Oxide Films and Nanostructures
- Non-Destructive Testing Techniques
- Aerospace and Aviation Technology
VTT Technical Research Centre of Finland
2011-2022
Tieto (Finland)
2020
Fuel Cells and Hydrogen
2015-2020
KTH Royal Institute of Technology
2001-2007
ElectroCell (Sweden)
2004
In polymer electrolyte fuel cells (PEFCs) gas diffusion backings (GDBs) have a significant effect on water management and cell performance. this study, methods for characterizing GDB performance by testing ex situ measurements are presented. The of four different commercial materials was tested differences were found between the materials. While behavior almost similar in single-phase region, flooding GDBs two-phase region varies widely. results show that using high clamping pressures...
The cost of storing and transporting hydrogen have been one the main challenges for realization economy. Liquid organic carriers (LOHC) are a promising novel solution to tackle these challenges. In this paper we compare LOHC concept compressed gas truck delivery on-site production via water electrolysis. As case study consider transportation by-product from chlor-alkali chlorate plants single industrial customer, which was considered greatest potential technology enter markets. results show...
An ejector primary gas flow control solution based on three solenoid valves is designed, implemented and tested in a 5 kW proton exchange membrane fuel cell (PEMFC) system with ejector-based anode recirculation. The robust cost effective combination of the method single shown to achieve adequate recirculation rate wide PEMFC load range. In addition, effect inert content performance studied at varying pressure levels. Results show that increasing increases recirculated mass but decreases both...
In this work, we investigated the kinetics and mass-transport limitations of oxygen reduction reaction in solid polymer fuel cell. The information obtained from electrochemical experiments electrode characterization was analyzed with an agglomerate model presented Part I paper. behavior cathode studied by polarizing vs. a hydrogen reference at low sweep rate. For each potential, iR-drop measured current-interrupt technique. structure porosimetry electron microscopy techniques. effects on...
The power ramp rate capabilities of a 5 kW proton exchange membrane fuel cell (PEMFC) system are studied theoretically and experimentally for grid support service applications. supply is implemented with fixed-geometry ejector discrete control solution without any anode-side pressure fluctuation suppression methods. We show that the stack can be ramped up from 2.0 to 4.0 adequate low anode fluctuations within only 0.1 s. air centrifugal blower. Air rates increase executed 1 0.2 s after...
Abstract In automotive‐type polymer electrolyte membrane fuel cell (PEMFC) systems, impurities and inert gases accumulate in the anode gas recirculation loop. Therefore, impurity limits, dictated by current hydrogen specification (ISO 14687‐2:2012), also require quantification with representative test systems applying recirculation, that enables high utilization rates accumulation of impurities.We report a novel PEMFC laboratory configuration mimicking automotive conditions. This setup...
Abstract The durability testing of membranes for use in a polymer electrolyte fuel cell (PEFC) has been studied situ by combination galvanostatic steady‐state and impedance measurements. PEFC measurements, which are time consuming, have compared to fast ex 3% H 2 O solution. For the direct assessment membrane degradation micro‐Raman spectroscopy determination ion exchange capacity (IEC) used. PVDF based membranes, radiation grafted with styrene sulfonated, were used as model membranes. By...
Abstract Performance losses due to flooding of gas diffusion layers (GDLs) and flow fields as well membrane dehydration are two the major problems in PEFC. In this investigation, effect GDL on cell water management PEFC is studied using segmented single experiments. The behaviour four different commercial GDLs was investigated at both high low inlet humidity conditions by galvanostatic fuel influence varying reactant composition studied. results show that none significantly flooded anode...
Abstract A two‐dimensional, non‐isothermal, two‐phase model of a polymer electrolyte fuel cell (PEFC) is presented. The developed for conditions where variations in the streamwise direction are negligible. In addition, experiments were conducted with segmented comprised net flow fields. The, experimentally obtained, current distributions used to validate PEFC developed. includes species transport and phase change water, coupled conservation momentum mass, porous backing cathode, charge heat...
Good thermal and electric contacts of gas diffusion layers (GDLs) with electrode surface flow-field plates are important for the performance a polymer electrolyte membrane fuel cell (PEMFC). These dependent on compression pressure applied GDL surface. The also affects porosity permeability, consequently has an impact mass transfer in GDL. Thus, distribution can have significant effect lifetime PEMFC stack. Typically, stacks assembled between two end plates, which function as supporting...
Abstract Adequate water management is crucial to increase stability and durability of Polymer Electrolyte Membrane Fuel Cells. In this paper, a test rig suitable for balance nitrogen crossover studies was built around hydrogen‐air segmented cell used indirectly assess flooding or drying conditions in specific zones the active area. particular, anode operated recirculation mode with continuous removal. Current density distribution (CDD) diagrams were obtained different operating parameters,...