Effects of tin phosphate nanosheet addition on proton-conducting properties ofudsulfonated poly(ether sulfone) membranes

摘要

Organic/inorganic composite membranes were prepared by dispersing nanosheets of layered tin phosphateudhydrate [Sn(HPO4)2·nH2O (SnP)] in sulfonated poly(ether sulfone) (SPES) at SnP contents of 0–40 vol.%.udThe stabilities and proton conductivities of SPES/SnP nanosheet (SnP-NS) composite membraneswere investigatedudand comparedwith those of SPES/SnP particle (SnP-P) composite membranes. The chemical stabilities as evaluatedudby thermogravimetry, differential thermal analysis, and diffuse reflectance Fourier-transform infrared spectroscopyudwere improved in both composite membranes. The improvement in the structural stability of SPES/SnP-NS compositeudmembranes was more evident than that in SPES/SnP-P. The results suggest that exfoliation of SnP increasesudthe area of the SPES–SnP interface and extends the connectivity of the network of hydrogen bonds. A compositeudmembrane containing 10 vol.% SnP-NS (SPES/SnP-NS10vol.%) showed a high conductivity of 5.9×10−2 S cm−1udat 150 °C under saturated water vapor pressure. Although less water was present in SPES/SnP-NS10vol.% than inudSPES/SnP-P10vol.% or pure SPES, the conductivity of SnP-NS10vol.% was the highest among these samples atud130 °C under a high relative humidity (RH). However at a low RH, the proton-conducting property was notudimproved by changing the composition of the SnP-NS. These results suggest that the hydrogen-bond networkudoperates effectively for proton conduction at a high RH, but at a low RH, the network fails to conduct as a resultudof a decrease in water content accompanied by structural stabilization.