A Broad Range Variable-Temperature NMR Spectral and Relaxation Investigation of the Water State in Nafion 117

2021 ◽  
Author(s):  
Ren-Hao Cheng ◽  
Honghao Cai ◽  
Yu-Ren Huang ◽  
Xiaohong Cui ◽  
Zhong Chen ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Transport ◽  
Transport Mechanism ◽  
Proton Exchange Membrane ◽  
Variable Temperature ◽  
Proton Exchange ◽  
Water State ◽  
Exchange Membrane

Understanding the water state in Nafion is not only crucial for operating a proton-exchange membrane (PEM)-based fuel cell, but also intimately related to the elucidation of the proton transport mechanism...

scholarly journals Development of a nafion-free proton transport cellulose membrane for the proton exchange membrane fuel cell

2020 ◽  
Author(s):  
Rebecca Isseroff ◽  
Miriam Rafailovich ◽  
Likun Wang ◽  
Aniket Raut ◽  
Bhawan Sandhu ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Transport ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Cellulose Membrane ◽  
Free Proton ◽  
Exchange Membrane

A NOVEL KIND OF PROTON EXCHANGE MEMBRANE: CHARACTERS AND PROTON TRANSPORT MECHANISM

2009 ◽  
Vol 27 (05) ◽  
pp. 755 ◽  
Author(s):  
Cheng Peng ◽  
Yong Yang ◽  
Li Wang ◽  
Min Huang ◽  
Xian-fa Shi
Keyword(s):  
Proton Transport ◽  
Transport Mechanism ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Exchange Membrane

scholarly journals Study of water transport mechanism based on the single straight channel of proton exchange membrane fuel cell

AIP Advances ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 105206
Author(s):  
Wei Yuan ◽  
Jie Li ◽  
Zhongxian Xia ◽  
Shizhong Chen ◽  
Xuyang Zhang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Water Transport ◽  
Transport Mechanism ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Straight Channel ◽  
Exchange Membrane

scholarly journals Development of a nafion-free proton transport cellulose membrane for the proton exchange membrane fuel cell

2020 ◽  
Author(s):  
Rebecca Isseroff ◽  
Miriam Rafailovich ◽  
Likun Wang ◽  
Aniket Raut ◽  
Bhawan Sandhu ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Transport ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Cellulose Membrane ◽  
Free Proton ◽  
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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