Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 36, Pages 19106-19115Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.03.033
Keywords
Proton exchange membrane; Metal-organic frameworks; Cellulose nanofibers; Orientation channel; Proton transfer
Categories
Funding
- National Key Technology RD Program [2016YFB0303300]
- National Natural Science Foundation of China [51603148, 51873152]
- Science and Technology Plans of Tianjin [17JCYBJC17200, 17JCZDJC38100, 18PTSYJC00180]
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Composite PEMs with blend nanofibers of cellulose and UiO-66-NH2 embedded in sulfonated polysulfone matrix show high proton conductivity, low methanol permeability, and low swelling ratio. They have great potential for use as proton-conducting nanofillers in fuel cell PEMs.
Metal-organic frameworks (MOFs) exhibit high proton conductivity, thermal stability, and offer immense flexibility in terms of tailoring their size. Owing to their unique characteristics, they are desirable candidates for proton conductors. Nevertheless, constructing ordered MOF proton channels in proton exchange membranes (PEMs) remains a formidable challenge. Herein, blend nanofibers of cellulose and UiO-66-NH2 (Cell-UiO-66-NH2) obtained via the electrospinning process were embedded in a sulfonated polysulfone matrix to obtain high-performance composite PEMs with an orderly arrangement of UiO-66-NH2. Comprehensive characterization and membrane performance tests reveal that composite membrane with 5 wt% (nominal) UiO-66-NH2 have revealed high proton conductivity of 0.196 S cm(-1) at 80 degrees C and 100% relative humidity. Meantime, the composite membrane exhibits a low methanol permeability coefficient (similar to 5.5 x 10(-7) cm(2) s(-1)). Moreover, the composite membrane exhibits a low swelling ratio (17.3%) even at 80 degrees C. The Cell-UiO-66-NH2 nanofibers exhibit strong potential for use as a proton-conducting nanofiller in fuelcell PEMs. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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