Journal
JOURNAL OF POWER SOURCES
Volume 332, Issue -, Pages 265-273Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.09.135
Keywords
Phosphoric acid; Covalent organic framework; Nafion; Composite membrane; Proton conductivity
Funding
- National Natural Science Foundation of China [21576189]
- State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University) [M2-201504]
- Programme of Introducing Talents of Discipline to Universities [B06006]
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Design and fabrication of efficient proton transport channels within solid electrolytes is crucial and challenging to new energy-relevant devices such as proton exchange membrane fuel cells (PEMFCs). In this study, the phosphoric acid (H3PO4) molecules are impregnated into SNW-1-type covalent organic frameworks (COFs) via vacuum assisted method. High loading of H3PO4 in SNW-1 and low guest leaching rate are achieved due to the similar diameter between H3PO4 and micropores in SNW-1. Then the COF-based composite membranes are fabricated for the first time with impregnated COFs (H3PO4@SNW-1) and Nafion matrix. For the composite membranes, the acid-base pairs formed between H3PO4@SNW-1 networks and Nafion optimize the interfacial interactions and hydrophilic domains. The acidic -PO3H2 groups in pores of H3PO4@SNW-1 provide abundant proton transfer sites. As a result, the continuous proton transfer channels with low energy barrier are created. At the filler content of 15 wt%, the composite membrane exhibits a superior proton conductivity of 0.0604 S cm(-1) at 51% relative humidity and 80 degrees C. At the same time, the maximum power density of single fuel cell is 603% higher than that of the recast Nafion membrane. (C) 2016 Elsevier B.V. All rights reserved.
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