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Title: More sustainable electricity generation in hot and dry fuel cells with a novel hybrid membrane of Nafion/nano-silica/hydroxyl ionic liquid

Journal Article · · Applied Energy
 [1];  [1];  [2];  [1];  [1];  [1];  [3];  [2];  [4]
  1. Wuhan Univ. (China)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Wuhan Univ. (China); Univ. of Nottingham Ningbo China (China)
  4. Wuhan Univ. (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, a new hybrid proton exchange membrane (PEM) has been prepared from hydroxyl functionalized imidazolium ionic liquid (IL-OH), Nafion and nano-SiO2. The IL-OH, with a hydroxyl group that acts as both a proton acceptor and donor, forms strong hydrogen bonds with both Nafion and nano-SiO2, resulting in an effective hydrogen bond network in the ternary membrane. Such an anhydrous hydrogen-bond network, which is unknown previously, endows the PEMs with higher proton conductivity, greater thermal stability and surprisingly a more robust mechanical performance than PEMs consisting of conventional ionic liquids. The resulting PEMs have a tensile strength that is more than twice as strong as recast Nafion and an anhydrous ionic conductivity of ~55 mS cm–1 at temperatures above 160 °C, with a proton transfer number of ~0.9. A laboratory assembled H2–O2 fuel cell employing this new PEM delivered a power density of 340 and 420 mW cm–2 at 160 and 180 °C, respectively.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Ministry of Education of China (MOE)
Grant/Contract Number:
ERKCC61; 21173161
OSTI ID:
1388374
Alternate ID(s):
OSTI ID: 1323972
Journal Information:
Applied Energy, Vol. 175, Issue C; Related Information: FIRST partners with Oak Ridge National Laboratory (lead); Argonne National Laboratory; Drexel University; Georgia State University; Northwestern University; Pennsylvania State University; Suffolk University; Vanderbilt University; University of Virginia; ISSN 0306-2619
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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