scholarly journals The Electrochemical Properties of the Porous Nafion Membrane for Proton Exchange Membrane Fuel Cells (PEMFCs)

2012 ◽  
Vol 33 (5) ◽  
pp. 1788-1790 ◽  
Author(s):  
Jong-Won Lee ◽  
Cheol-Woo Yi ◽  
Keon Kim
Keyword(s):  
Fuel Cells ◽  
Electrochemical Properties ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Nafion Membrane ◽  
Exchange Membrane

Design of a Climate Chamber to Study Transient Performance of a Proton Exchange Membrane Fuel Cell at Near Freezing Temperatures

2010 ◽  
Author(s):  
Daniel Cassar ◽  
Xia Wang
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Internal Heat ◽  
Proton Exchange ◽  
Operating Conditions ◽  
Nafion Membrane ◽  
Thermoelectric Device ◽  
Climate Chamber ◽  
Freezing Temperatures ◽  
Exchange Membrane

Freezing temperature startup of fuel cells is a serious issue for smaller applications such as auxiliary or backup power units. To accurately test and examine this problem, a laboratory climate chamber is required which can accurately represent possible environments. This research designed a climate chamber using thermoelectric (peltier) heat pumps to provide temperatures down up to −10 degrees Celsius. The internal heat absorption from air utilized forced convection while heat emitted by the thermoelectric device was removed by flowing water channels. A copper plate was used to provide separation between the heat absorbing plate and the thermoelectric heat pump. The unit showed accurate temperature control and successful operation at sub-zero temperatures. Two proton exchange membrane fuel cells with 117 Nafion membrane and 212 Nafion membrane were tested in the climate chamber under various operating conditions. The startup performance was examined under both freezing and non-freezing temperatures. Heated and humidified feed gasses were shown to greatly improve the steady state time of the 117 setup by over 30%.

Catalyst layers for proton exchange membrane fuel cells prepared by electrospray deposition on Nafion membrane

2011 ◽  
Vol 196 (9) ◽  
pp. 4200-4208 ◽  
Author(s):  
A.M. Chaparro ◽  
P. Ferreira-Aparicio ◽  
M.A. Folgado ◽  
A.J. Martín ◽  
L. Daza
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Nafion Membrane ◽  
Electrospray Deposition ◽  
Catalyst Layers ◽  
Exchange Membrane

Modification of Nafion membrane with biofunctional SiO 2 nanofiber for proton exchange membrane fuel cells

2017 ◽  
Vol 340 ◽  
pp. 201-209 ◽  
Author(s):  
Hang Wang ◽  
Xiaojie Li ◽  
Xupin Zhuang ◽  
Bowen Cheng ◽  
Wei Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Nafion Membrane ◽  
Exchange Membrane

Highly proton conductive membranes based on carboxylated cellulose nanofibres and their performance in proton exchange membrane fuel cells

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Annika Carlson ◽  
Shun Yu ◽  
Göran Lindbergh ◽  
Rakel Wreland Lindström ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Surface Charge ◽  
Proton Exchange Membrane ◽  
Membrane Surface ◽  
Proton Exchange ◽  
Membrane Thickness ◽  
Fuel Cell Performance ◽  
Cellulose Nanofibres ◽  
Exchange Membrane

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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