A New High Voltage Impedance Spectrometer for the Diagnostics of Fuel Cell Stacks

2010 ◽  
Vol 8 (2) ◽  
Author(s):  
Sébastien Wasterlain ◽  
Fabien Harel ◽  
Denis Candusso ◽  
Daniel Hissel ◽  
Xavier François
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Cell Behavior ◽  
Polarization Current ◽  
Operational Parameters ◽  
Galvanostatic Mode ◽  
Validation Tests ◽  
Exchange Membrane ◽  
Synchronous Measurement

This paper presents a novel architecture of an impedance spectrometer dedicated to the characterization and diagnostics of large fuel cell stacks operated in galvanostatic mode. The validation tests are first performed on a single proton exchange membrane fuel cell (PEMFC). Then, experiments are carried out on a 20-cell PEMFC stack delivering more significant power levels. The proposed impedancemeter allows spectrum measurements on cells located in the middle of the stack, where common mode potentials are usually too high for commercial devices. Moreover, the impedances of different individual cells in the stack are acquired with a synchronous measurement reference (global stack impedance). This capability allows distinguishing any singular cell behavior or drift effect of operational parameters (e.g., stack temperature and polarization current).

A New High Voltage Impedance Spectrometer for the Diagnostic of Fuel Cell Stacks

2010 ◽  
Author(s):  
Se´bastien Wasterlain ◽  
Fabien Harel ◽  
Denis Candusso ◽  
Daniel Hissel ◽  
Xavier Franc¸ois
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Cell Behavior ◽  
Polarization Current ◽  
Operational Parameters ◽  
Galvanostatic Mode ◽  
Validation Tests ◽  
Exchange Membrane ◽  
Synchronous Measurement

This paper presents a novel architecture of an impedance spectrometer dedicated to the characterization and diagnostic of large Fuel Cell (FC) stacks operated in galvanostatic mode. The validation tests are first performed on a single Proton Exchange Membrane Fuel Cell (PEMFC). Then, experiments are carried out on a twenty-cell PEMFC stack delivering more significant power levels. The proposed impedancemeter allows spectrum measurements on cells located in the middle of the stack, where common mode potentials are usually too high for commercial devices. Moreover, the impedances of different individual cells in the stack are acquired with a synchronous measurement reference (global stack impedance). This capability allows distinguishing any singular cell behavior or drift effect of operational parameters (e.g. stack temperature and polarization current).

An Experimental Study of Operational Parameters on the Performance of PEMFCs

2010 ◽  
Author(s):  
Emad G. Barakat ◽  
Ali K. Abdel-Rahman ◽  
Mahmoud A. Ahmed ◽  
Ahmed Hamza H. Ali
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Operating Pressure ◽  
Operational Parameters ◽  
Cell Temperature ◽  
Power Increase ◽  
Set Up ◽  
Exchange Membrane ◽  
Gas Humidification

The performance of Proton exchange membrane fuel cell (PEMFC) has been experimentally investigated. An experimental set-up was designed to study the effects of operating parameters such as cell temperature, gas humidification, and cell operating pressure on the performance of fuel cell. The results indicated that the output power increase with the increase of humidification ratio. Furthermore, an increase of cell pressure results in a significant increase of cell power. The results indicated that increasing of the temperature leads to a decrease of cell power. The results are explained and discussed in more details for different operational parameters.

Hybridization Scheme for a Proton Exchange Membrane Fuel Cell/Supercapacitor System

2018 ◽  
Vol 15 (4) ◽  
Author(s):  
Marco A. Rodríguez ◽  
Alok Rastogi ◽  
Victor Skormin
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Genetic Optimization ◽  
Threshold Values ◽  
Operational Parameters ◽  
High Power Output ◽  
Exchange Membrane ◽  
System Operating

Proton exchange membrane (PEM) fuel cells suffer noticeable power loss when operated at high power output. This paper proposes a hybridization scheme for a PEM fuel cell/supercapacitor system operating in three different regimes: “Flat,” “Uphill,” and “Downhill.” Transitions among operational regimes are governed by logical statements, which compare operational parameters against threshold values. These threshold values were obtained using a genetic optimization (GO) algorithm. The hybridization problem is analyzed in a simulation environment before the solution is implemented in an actual laboratory prototype. Results and discussion are presented to demonstrate the soundness of the proposed solution. The approach presented in this paper is suitable for applications where sudden changes in power demand occur.

scholarly journals Parametric Effects on Proton Exchange Membrane Fuel Cell Performance: An Analytical Perspective

2020 ◽  
Vol 5 (5) ◽  
pp. 926-938
Author(s):  
Rupendra Pachauri ◽  
Abhishek Sharma ◽  
Shailendra Rajput
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Operating Temperature ◽  
Membrane Resistance ◽  
Proton Exchange ◽  
Operational Parameters ◽  
Fuel Cell Performance ◽  
Simulink Model ◽  
Parametric Effects ◽  
Exchange Membrane

This paper introduces a regression study on the operating parameters of different types of fuel cells (FCs) such as fuel used, catalysts, efficiency, operating temperature, switching time, load carriers, applications with advantages. In addition, mathematical modeling of the Proton exchange membrane fuel cell (PEMFC) is considered for MATLAB simulation and the inter-relationships of the parametric effect schemes are discussed. In the current study, the significant operational parameters such as operating temperature, reactant (H2 and O2) flow pressure, and membrane resistance are considered. The procured results in the form of I-V or polarization curve, efficiency, power and current density have been utilized owing to study the PEMFC behavior. For the validation, designed a single MATLAB/Simulink model of PEMFC is compared with commercial existing model. The results reflect the fine coordination between the simulated and commercially available PEMFC model. Present study can be used as a supportive tool to beginners to select the appropriate parameters for a FC assisted applications.

Highly proton conductive membranes based on carboxylated cellulose nanofibres and their performance in proton exchange membrane fuel cells

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Annika Carlson ◽  
Shun Yu ◽  
Göran Lindbergh ◽  
Rakel Wreland Lindström ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Surface Charge ◽  
Proton Exchange Membrane ◽  
Membrane Surface ◽  
Proton Exchange ◽  
Membrane Thickness ◽  
Fuel Cell Performance ◽  
Cellulose Nanofibres ◽  
Exchange Membrane

The performance of thin carboxylated cellulose nanofiber-based (CNF) membranes as proton exchange membranes in fuel cells has been measured in-situ as a function of CNF surface charge density (600 and 1550 µmol g<sup>-1</sup>), counterion (H<sup>+</sup>or Na<sup>+</sup>), membrane thickness and fuel cell relative humidity (RH 55 to 95 %). The structural evolution of the membranes as a function of RH as measured by Small Angle X-ray scattering shows that water channels are formed only above 75 % RH. The amount of absorbed water was shown to depend on the membrane surface charge and counter ions (Na<sup>+</sup>or H<sup>+</sup>). The high affinity of CNF for water and the high aspect ratio of the nanofibers, together with a well-defined and homogenous membrane structure, ensures a proton conductivity exceeding 1 mS cm<sup>-1</sup>at 30 °C between 65 and 95 % RH. This is two orders of magnitude larger than previously reported values for cellulose materials and only one order of magnitude lower than Nafion 212. Moreover, the CNF membranes are characterized by a lower hydrogen crossover than Nafion, despite being ≈ 30 % thinner. Thanks to their environmental compatibility and promising fuel cell performance the CNF membranes should be considered for new generation proton exchange membrane fuel cells.<br>

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