Thermal stability analysis of cold start processes in PEM fuel cells

2020 ◽  
Vol 261 ◽  
pp. 114430 ◽  
Author(s):  
Weitong Pan ◽  
Ping Li ◽  
Quanquan Gan ◽  
Xueli Chen ◽  
Fuchen Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Fuel Cells ◽  
Stability Analysis ◽  
Cold Start ◽  
Pem Fuel Cells

scholarly journals Enhancing Physicochemical Properties and Single Cell Performance of Sulfonated Poly(arylene ether) (SPAE) Membrane by Incorporation of Phosphotungstic Acid and Graphene Oxide: A Potential Electrolyte for Proton Exchange Membrane Fuel Cells

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2364
Author(s):  
Sung Kwan Ryu ◽  
Ae Rhan Kim ◽  
Mohanraj Vinothkannan ◽  
Kyu Ha Lee ◽  
Ji Young Chu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Fuel Cells ◽  
Composite Membrane ◽  
Proton Exchange Membrane ◽  
Phosphotungstic Acid ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Arylene Ether ◽  
Sulfonated Poly

The development of potential and novel proton exchange membranes (PEMs) is imperative for the further commercialization of PEM fuel cells (PEMFCs). In this work, phosphotungstic acid (PWA) and graphene oxide (GO) were integrated into sulfonated poly(arylene ether) (SPAE) through a solution casting approach to create a potential composite membrane for PEMFC applications. Thermal stability of membranes was observed using thermogravimetric analysis (TGA), and the SPAE/GO/PWA membranes exhibited high thermal stability compared to pristine SPAE membranes, owing to the interaction between SPAEK, GO, and PWA. By using a scanning electron microscope (SEM) and atomic force microscope (AFM), we observed that GO and PWA were evenly distributed throughout the SPAE matrix. The SPAE/GO/PWA composite membrane comprising 0.7 wt% GO and 36 wt% PWA exhibited a maximum proton conductivity of 186.3 mS cm−1 at 90 °C under 100% relative humidity (RH). As a result, SPAE/GO/PWA composite membrane exhibited 193.3 mW cm−2 of the maximum power density at 70 °C under 100% RH in PEMFCs.

Reversible performance loss induced by sequential failed cold start of PEM fuel cells

2011 ◽  
Vol 36 (19) ◽  
pp. 12444-12451 ◽  
Author(s):  
Junbo Hou ◽  
Hongmei Yu ◽  
Min Yang ◽  
Wei Song ◽  
Zhigang Shao ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Cold Start ◽  
Pem Fuel Cells ◽  
Performance Loss

Effect of Sub-Freezing Temperature on a PEM Fuel Cell

2006 ◽  
Author(s):  
Q. G. Yan ◽  
H. Toghiani
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Cold Start ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Operating Conditions ◽  
Normal Operation ◽  
Subzero Temperatures ◽  
Wide Range ◽  
Backing Layer

The cold-start behavior and the effect of subzero temperatures on fuel cell performance were studied using a 25-cm2 PEMFC. The fuel cell system was housed in an environmental chamber that allowed the system to be subjected to temperatures ranging from sub-freezing to those encountered during normal operation. Fuel cell cold-start was investigated under a wide range of operating conditions. The cold-start measurements showed that the cell was capable of starting operation at −5 °C without irreversible performance loss when the cell was initially dry. The fuel cell was also able to operate at low environmental temperatures, down to −15 °C. However, irreversible performance losses were found if the cell cathode temperature fell below −5 °C during operation. Freezing of the water generated by fuel cell operation damaged fuel cell internal components. Several low temperature failure cases were investigated in PEM fuel cells that underwent sub-zero start and operation from −20 °C. Cell components were removed from the fuel cells and analyzed with scanning electron microscopy (SEM). Significant damage to the MEA and backing layer was observed in these components after operation below −5 °C. Catalyst layer delamination from both the membrane and the gas diffusion layer (GDL) was observed, as were cracks in the membrane, leading to hydrogen crossover. The membrane surface became rough and cracked and pinhole formation was observed in the membrane after operation at subzero temperatures. Some minor damage was observed to the backing layer coating Teflon and binder structure due to ice formation during operation.

Experimental and Numerical Analysis of Subfreezing Operation in PEM Fuel Cells

2010 ◽  
Author(s):  
Jeff Mishler ◽  
Yun Wang ◽  
Partha P. Mukherjee ◽  
Rangachary Mukundan ◽  
Rodney L. Borup
Keyword(s):  
Fuel Cells ◽  
Neutron Radiography ◽  
Polymer Electrolyte Membrane ◽  
Cell Voltage ◽  
Cold Start ◽  
Pem Fuel Cells ◽  
Electrolyte Membrane ◽  
Model Predictions ◽  
Water Formation ◽  
Solid Water

In this work, we present a neutron radiography and analysis, as well as modeling study on cold-start operation of polymer electrolyte membrane (PEM) fuel cells. Fuel cells with Gore™ or LANL MEAs and SGL or E-Tek ELAT GDLs are tested in varying subfreezing temperatures (−40 to 0°C) to determine the time scale of cold-start failure, amount of solid water formation, solid water formation location, and. A higher PTFE-loading in the MPL is found to decrease loss in electrocatalytic surface area in our case. Theoretical analysis is also conducted and model predictions are compared with the experimental data in terms of the cell voltage evolution.

Statistic analysis of operational influences on the cold start behaviour of PEM fuel cells

2005 ◽  
Vol 145 (2) ◽  
pp. 407-415 ◽  
Author(s):  
M. Oszcipok ◽  
D. Riemann ◽  
U. Kronenwett ◽  
M. Kreideweis ◽  
M. Zedda
Keyword(s):  
Fuel Cells ◽  
Cold Start ◽  
Pem Fuel Cells ◽  
Statistic Analysis
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