Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 27, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201701465
Keywords
acylhydrazone; electrolyte; gels; proton conductivity; subzero temperature
Categories
Funding
- National Natural Science Foundation of China [21603228, 51402293, 21273239]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
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Proton exchange membrane fuel cells usually suffer from severe power loss and even damage under subzero-temperature working surroundings, which restricts their practical use in cold climates and in high-altitude drones. One of the effective solutions to these issues is to develop new types of proton-conductive materials at subzero temperature. This study presents a series of acylhydrazone-based covalent organic gels (COGs). The COGs are stable in acidic media and show high proton conductivity over the temperature range of -40 to 60 degrees C under anhydrous conditions. Compared with other reported organic conductive materials, both a state-of-the-art conductivity of 3.8 x 10(-4) S cm(-1) at -40 degrees C and superior long-term stability are demonstrated. Moreover, the COGs possess remarkable self-sustainability, good processability, and superior mechanical properties, and may be processed and molded into any desirable shapes for practical applications. These advantages make COGs hold great promises as solid-state electrolytes under subzero-temperature operating conditions.
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