scholarly journals Elucidating the Dynamic Nature of Fuel Cell Electrodes as a Function of Conditioning: An ex Situ Material Characterization and in Situ Electrochemical Diagnostic Study

2019 ◽  
Vol 11 (48) ◽  
pp. 45016-45030 ◽  
Author(s):  
Sadia Kabir ◽  
Deborah J. Myers ◽  
Nancy Kariuki ◽  
Jaehyung Park ◽  
Guanxiong Wang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Material Characterization ◽  
Ex Situ ◽  
Diagnostic Study ◽  
Dynamic Nature ◽  
Fuel Cell Electrodes

Fabrication, In-Situ Performance, and Durability of Nanofiber Fuel Cell Electrodes

2014 ◽  
Vol 162 (1) ◽  
pp. F84-F91 ◽  
Author(s):  
Matthew Brodt ◽  
Taehee Han ◽  
Nilesh Dale ◽  
Ellazar Niangar ◽  
Ryszard Wycisk ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Fuel Cell Electrodes

In-Situ and Ex-Situ Investigation of Lateral Current Density Variations in a PEM Fuel Cell With Serpentine Flow Field

2009 ◽  
Author(s):  
Andrew Higier ◽  
Hongtan Liu
Keyword(s):  
Fuel Cell ◽  
Flow Field ◽  
Contact Resistance ◽  
Current Density ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Operating Conditions ◽  
Ex Situ ◽  
Serpentine Flow Field

One of the most common types of flow field designs used in proton exchange membrane (PEM) fuel cell is the serpentine flow field. It is used for its simplicity of design, its effectiveness in distributing reactants and its water removal capabilities. The knowledge about where current density is higher, under the land or the channel, is critical for flow field design and optimization. Yet, no direct measurement data are available for serpentine flow fields. In this study a fuel cell with a single channel serpentine flow field is used to separately measure the current density under the land and channel on the cathode. In this manner, a systematic study is conducted under a wide variety of conditions and a series of comparisons are made between land and channel current density. Results show that under most operating conditions, current density is higher under the land than that under the channel. However, at low voltage, a rapid drop off in current density occurs under the land due to concentration losses. In order to investigate the cause of the variations of current density under the land and channel and series of ex-situ and in-situ experiments were conducted. In the ex-situ portion of the study, the contact resistance between the gas diffusion electrode (GDE) and the graphite flow plate were measured using an ex-situ impedance spectroscopy technique. The values of the contact resistance under the channel were found to be larger than that under the land. This implies that the contact resistance under the land and channel vary greatly, likely due to variations in compression under different section of the flow field. These variations in turn cause current density variations under the land and channel.

Pore Formation by In Situ Etching of Nanorod PEM Fuel Cell Electrodes

2010 ◽  
Vol 157 (1) ◽  
pp. B113 ◽  
Author(s):  
M. D. Gasda ◽  
G. A. Eisman ◽  
D. Gall
Keyword(s):  
Fuel Cell ◽  
Pore Formation ◽  
Pem Fuel Cell ◽  
Fuel Cell Electrodes
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