Health degradation assessment of proton exchange membrane fuel cell based on an analytical equivalent circuit model

Energy ◽  
2020 ◽  
Vol 207 ◽  
pp. 118185 ◽  
Author(s):  
Rui Pan ◽  
Duo Yang ◽  
Yujie Wang ◽  
Zonghai Chen
2014 ◽  
Vol 952 ◽  
pp. 194-200 ◽  
Author(s):  
Hui Cui Chen ◽  
Pu Cheng Pei

An equivalent circuit model of the PEM fuel cell is built to study the voltage dynamic response during load change. A mathematical model is built to simulate the voltage response during load change. The simulation results fit the test results very well. Then the model is applied to predict the limiting operation condition of the fuel cell. The model also provides a reference to design PEM fuel cell control modes.


2019 ◽  
Author(s):  
Valentina Guccini ◽  
Annika Carlson ◽  
Shun Yu ◽  
Göran Lindbergh ◽  
Rakel Wreland Lindström ◽  
...  

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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