Relationships of Acid and Water Content to Proton Transport in Statistically Sulfonated Proton Exchange Membranes:  Variation of Water Content Via Control of Relative Humidity

2008 ◽  
Vol 112 (10) ◽  
pp. 2848-2858 ◽  
Author(s):  
Timothy J. Peckham ◽  
Jennifer Schmeisser ◽  
Steven Holdcroft
Keyword(s):  
Relative Humidity ◽  
Water Content ◽  
Proton Transport ◽  
Proton Exchange Membranes ◽  
Proton Exchange

Simultaneous Investigation of PEMFC Performance and Water Content at Different Flow Rates and Relative Humidities

2014 ◽  
Author(s):  
Mohammadreza Hasheminasab ◽  
Ali Bozorgnezhad ◽  
Mehrzad Shams ◽  
Goodarz Ahmadi ◽  
Homayoon Kanani
Keyword(s):  
Relative Humidity ◽  
Water Content ◽  
Proton Exchange Membrane ◽  
Catalyst Layer ◽  
High Water ◽  
Proton Exchange ◽  
Cell Performance ◽  
High Water Content ◽  
Serpentine Flow Field ◽  
Membrane Dehydration

In order to prevent membrane dehydration and flooding in proton exchange membrane fuel cells (PEMFC), appropriate water management must be done. Therefore, accurate knowledge of the effects of various parameters on cell water content is needed. This knowledge helps to achieve optimum cell performance. The effects of both anode and cathode stoichiometry and relative humidity on single serpentine PEMFC performance and flow channel water content are surveyed experimentally. All tests conducted on transparent fuel cell with serpentine flow field channels and 25cm2 MEA active areas. Digital image processing is performed on the captured images of cathode channel to detect accumulated water at that side. The results indicate that there is a correlation between water content of cathode flow channels and cell performance. Increasing cathode water content causes membrane hydration which leads to better cell performance, but high water content causes flooding. It is concluded that both stoichiometry and relative humidity have significant effect on cell performance. Increasing reactant relative humidity improves water transport mechanisms within the cell, but fully humidified reactants may causes flooding. Although high stoichiometry rate prevents flooding and facilitate reactants transport within catalyst layer, high anode and cathode stoichiometry leads to membrane dehydration. Experimental observation shows that both stoichiometry and relative humidity have optimum value.

Accurate measurement of the through-plane water content of proton-exchange membranes using neutron radiography

2012 ◽  
Vol 112 (10) ◽  
pp. 104906 ◽  
Author(s):  
D. S. Hussey ◽  
D. Spernjak ◽  
A. Z. Weber ◽  
R. Mukundan ◽  
J. Fairweather ◽  
...  
Keyword(s):  
Water Content ◽  
Neutron Radiography ◽  
Proton Exchange Membranes ◽  
Proton Exchange

Mesoscale Study of Proton Transport in Proton Exchange Membranes: Role of Morphology

2015 ◽  
Vol 119 (4) ◽  
pp. 1753-1762 ◽  
Author(s):  
Shule Liu ◽  
John Savage ◽  
Gregory A. Voth
Keyword(s):  
Proton Transport ◽  
Proton Exchange Membranes ◽  
Proton Exchange

Enhanced proton conductivity of multiblock poly(phenylene ether ketone)s via pendant sulfoalkoxyl side chains with excellent H2/air fuel cell performance

2016 ◽  
Vol 4 (6) ◽  
pp. 2321-2331 ◽  
Author(s):  
Tiandu Dong ◽  
Jiahui Hu ◽  
Mitsuru Ueda ◽  
Yiming Wu ◽  
Xuan Zhang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Relative Humidity ◽  
Proton Conductivity ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Cell Performance ◽  
Side Chains ◽  
Fuel Cell Performance ◽  
Ether Ketone

A multi-block compositing graft concept is investigated to fabricate proton exchange membranes. The prepared membranes demonstrate excellent ion conductive capacity and better fuel cell performance over the entire relative humidity conditions, compared to Nafion.

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