Journal
FIBERS AND POLYMERS
Volume 19, Issue 8, Pages 1585-1595Publisher
KOREAN FIBER SOC
DOI: 10.1007/s12221-018-8352-3
Keywords
Cadmium telluride nanocrystals; Polyurethane; Sulfonated poly(ether ether) ketone; Layer by layer self-assembly; Proton conductivity
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Funding
- National Natural Science Foundation of China [21703029]
- Scientific Research Fund of Liaoning Provincial Education Department [L20150166]
- China Scholarship Council [201208210023]
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Layer by layer (LBL) self-assembly technique has been proved to be a feasible method that enables to accomplish the preparation of functional membranes with multilayered structure. In this research, the polymer of sulfonated polyetheretherketone (SPEEK) and thioglycolic acid capping of cadmium telluride (CdTe) nanocrystals as polyanion, the polymer of polyurethane (PU) as polycation have been used to prepare membrane electrolytes. These multilayered membranes showed good thermal stability and exhibited low liquid methanol permeability, which provided a possibility for the prepared membranes as proton exchange membranes (PEMs) to apply in direct methanol fuel cells (DMFCs). We have also demonstrated that the multicomponent (SPEEK/PU/CdTe/PU)(100) membranes favored to combine more phosphoric acid (PA) molecules and possessed a higher proton conductivity comparing to the bicomponent (SPEEK/PU)(210) membranes. So PA doped (SPEEK/PU/CdTe/PU)(100) membrane presented a maximum proton conductivity up to 8.6x10(-2) S/cm at 160 A degrees C under anhydrous conditions. However, PA doped (SPEEK/PU)(210) membranes underwent a drop on proton conductivity while the temperature exceeded 120 A degrees C.
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