Visualization and understanding of the degradation behaviors of a PEFC Pt/C cathode electrocatalyst using a multi-analysis system combining time-resolved quick XAFS, three-dimensional XAFS-CT, and same-view nano-XAFS/STEM-EDS techniques

2020 ◽  
Vol 22 (34) ◽  
pp. 18919-18931
Author(s):  
Kotaro Higashi ◽  
Shinobu Takao ◽  
Gabor Samjeské ◽  
Hirosuke Matsui ◽  
Mizuki Tada ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Three Dimensional ◽  
Membrane Electrode Assembly ◽  
Polymer Electrolyte Fuel Cell ◽  
Membrane Electrode ◽  
Time Resolved ◽  
Degradation Behaviors ◽  
Analysis System

We developed a multi-analysis system that can measure in situ time-resolved quick XAFS and in situ three-dimensional XAFS-CT in the same area of a cathode electrocatalyst layer in a membrane-electrode assembly of a polymer electrolyte fuel cell.

In Situ Temperature Distribution Measurement in an Operating Polymer Electrolyte Fuel Cell

2003 ◽  
Author(s):  
Matthew M. Mench ◽  
Daniel J. Burford ◽  
Tyler W. Davis
Keyword(s):  
Fuel Cell ◽  
Temperature Distribution ◽  
Polymer Electrolyte ◽  
Membrane Electrode Assembly ◽  
Polymer Electrolyte Fuel Cell ◽  
Membrane Electrode ◽  
Two Phase ◽  
Temperature Distribution Measurement ◽  
Current Densities

The temperature distribution in a polymer electrolyte fuel cell (PEFC) is of critical importance to the water balance, as well as to other kinetic and transport phenomena that are known to be functionally dependent on temperature. However, direct measurement of localized temperature is difficult, due to the two-phase nature of flow in the gas channels and the small through-plane dimensions of a typical electrolyte. To circumvent these difficulties, an array of microthermocouples was embedded directly between two 25 μm thick Nation™ electrolyte sheets of a membrane electrode assembly. The embedded array was used to measure electrolyte temperature as a function of current and fuel cell flow channel location. For the fuel cell tested with natural convective cooling, a temperature increase in the electrolyte of as much as 15°C is observed for current densities of 1 A/cm2.

Discharge of a Segmented Polymer Electrolyte Membrane Fuel Cell

2004 ◽  
Vol 2 (2) ◽  
pp. 111-120 ◽  
Author(s):  
P. Berg ◽  
K. Promislow ◽  
J. Stumper ◽  
B. Wetton
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Water Distribution ◽  
Polymer Electrolyte Membrane ◽  
Parameter Tuning ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Transient Model ◽  
Electrolyte Membrane

We present a transient model for an electrically segmented polymer electrolyte membrane (PEM) fuel cell which is run until extinction from a finite oxygen supply. The experimental cell is divided into 16 electrically isolated pucks which are fed oxygen from a small reserve and hydrogen from a conventional flow field. The experimental voltage and through-plane current in each puck, and puck-to-puck currents are recorded and compared to computed profiles. Seven qualitative characteristics of the current profiles during discharge are identified. These are used as targets for parameter tuning, from which puck-to-puck water distribution within the membrane electrode assembly (MEA) is inferred. The model is sensitive to system parameters, and holds promise as an in situ diagnostic tool for tracking this distribution by using MEA oxygen transport characteristics.

scholarly journals APPLICATION OF SULFONATED POLYSTYRENE IN POLYMER ELECTROLYTE FUEL CELL

2018 ◽  
Vol 20 (1) ◽  
pp. 44
Author(s):  
Sunit Hendrana ◽  
Erwin Erwin ◽  
Krisman Krisman ◽  
Syakbaniah Syakbaniah ◽  
Isna’im Isna’im ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Cell Membrane ◽  
Small Molecules ◽  
Polymer Electrolyte ◽  
Membrane Electrode Assembly ◽  
Polymer Electrolyte Fuel Cell ◽  
Membrane Electrode ◽  
Sulfonate Group ◽  
Binding Agent ◽  
Sulfonated Polystyrene

APPLICATION OF SULFONATED POLYSTYRENE IN POLYMER ELECTROLYTE FUEL CELL. Sulfonated polystyrene (SPS) is polyelectrolyte solid that widely used in many aplications. In this works SPS is applied for some parts of polymer electrolyte fuel cell membrane due sulfonate group available in the structure. The investigation involve the application for membrane with addition of small molecules, i.e. benzimidazole and evaluating its microstructure and performance. Application of SPS solution as binding agent in MEA will also be presented.  The results show that when using SPS as fuel cell membrane, the additon of small molecules such as benzimidazole would modify its microstrusture as well as improve its ion conductivity. Meanwhile, some improvement still required for application of SPS solution as binding agent for preparation of Membrane Electrode Assembly or MEA.

Investigation on the Structure of a Membrane Electrode Assembly for a Polymer Electrolyte Fuel Cell

2003 ◽  
Vol 2003.3 (0) ◽  
pp. 295-296 ◽  
Author(s):  
George KOIKE ◽  
Kojiro NISHIOKA ◽  
Kohei NAGAHARA ◽  
Tomoyuki WAKISAKA ◽  
Yogo TAKADA ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Membrane Electrode Assembly ◽  
Polymer Electrolyte Fuel Cell ◽  
Membrane Electrode

Development and Application of a Sample Holder for In Situ Gaseous TEM Studies of Membrane Electrode Assemblies for Polymer Electrolyte Fuel Cells

2017 ◽  
Vol 23 (5) ◽  
pp. 945-950 ◽  
Author(s):  
Takeo Kamino ◽  
Toshie Yaguchi ◽  
Takahiro Shimizu
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Structural Changes ◽  
Membrane Electrode Assembly ◽  
Polymer Electrolyte Fuel Cells ◽  
Polymer Electrolyte Fuel Cell ◽  
Membrane Electrode ◽  
Sample Holder ◽  
Electrode Assemblies

AbstractPolymer electrolyte fuel cells hold great potential for stationary and mobile applications due to high power density and low operating temperature. However, the structural changes during electrochemical reactions are not well understood. In this article, we detail the development of the sample holder equipped with gas injectors and electric conductors and its application to a membrane electrode assembly of a polymer electrolyte fuel cell. Hydrogen and oxygen gases were simultaneously sprayed on the surfaces of the anode and cathode catalysts of the membrane electrode assembly sample, respectively, and observation of the structural changes in the catalysts were simultaneously carried out along with measurement of the generated voltages.

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