Add time:07/14/2019         Source:sciencedirect.com

Poly(vinyl alcohol)/poly(2-acrylamido-2-methyl-1-propanesulfonic acid (PAMPS)/3-glycidyloxypropyl)trimethoxysilane (PVA/PAMPS/GPTMS) organic/inorganic proton-conducting polymer membranes are prepared by a solution casting method. PAMPS is a polymeric acid commonly used as a primary proton donor, while 3-(glycidyloxypropyl)trimethoxysilane (GPTMS) is an inorganic precursor forming a semi-interpenetrating network (SIPN). Varying amounts of sulfosuccinic acid (SSA) are used as the cross-linker and secondary proton source. The characteristic properties of PVA/PAMPS/GPTMS composite membranes are investigated by thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), micro-Raman spectroscopy and the AC impedance method. Direct methanol fuel cells (DMFCs) made of PVA/PAMPS/GPTMS composite membranes are assembled and examined. Experimental results indicate that DMFCs employing an inexpensive, non-perfluorinated, organic/inorganic SIPN membrane achieve good electrochemical performance. The highest peak power density of a DMFC using PVA/PAMPS/GPTMS composite membrane with 2 M CH3OH solution fuel at ambient temperature is 23.63 mW cm−2. The proposed organic/inorganic proton-conducting membrane based on PVA/PAMPS/GPTMS appears to be a viable candidate for future DMFC applications.

► Dual proton sources of poly(2-acrylamido-2-methyl-1-propanesulfonic acid (PAMPS) and sulfosuccinic ► acid (SSA) are used to blend PVA host polymer to enhance the proton ionic conductivity; it is found that the ionic conductivity is of the order of 10−2 S cm−1 at room temperature. ► 3-(glycidyloxypropyl)trimethoxysilane (GPTMS) is applied to the composite polymer membrane form a semi-interpenetrating network (SIPN) to improve the dimensional stability. ► The cell performance of DMFC depends on the composition of the composite polymer membranes and the operating conditions.

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