Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 29, Pages 15866-15877Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.02.022
Keywords
Thermal crosslinking; Sulfonated poly(ether ether ketone); Sulfonated poly(aryl ether sulfone); Stability; Fuel cell
Categories
Funding
- National Natural Science Foundation of China [51708295]
- Fundamental Research Funds for the Central Universities [30920021114]
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This study investigates the effect of thermal crosslinking on SPEEK/SPAES membranes, showing that the thermally-crosslinked membranes exhibit excellent physicochemical and electrochemical performance, indicating potential applications in fuel cells.
The development of hydrocarbon polymer electrolyte membranes with high proton conductivities and good stability as alternatives to perfluorosulfonic acid membranes is an ongoing research effort. A facile and effective thermal crosslinking method was carried out on the blended sulfonated poly (ether ether ketone)/poly (aryl ether sulfone) (SPEEK/SPAES) system. Two SPEEK polymers with ion exchange capacities (IECs) of 1.6 and 2.0 mmol g(-1) and one SPAES polymer (2.0 mmol g(-1)) were selected to create different blends. The effect of thermal crosslinking on the fundamental properties of the membranes, especially their physicochemical stability and electrochemical performance, were investigated in detail. The homogeneous and flexible thermally-crosslinked SPEEK/SPAES membranes displayed excellent mechanical toughness (27-46 Mpa), suitable water uptake (<60%), high dimensional stability (swelling ratio < 15%) and large proton conductivity (>120 mS cm(-1)) at 80 degrees C. The thermal crosslinking membranes also show significantly enhanced hydrolytic (<2.5%) and oxidative stability (<2%). Fuel cell with t-SPEEK/SPAES (1:2:2) membrane achieves a power density of 665 mW cm(-2) at 80 degrees C. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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