PW9V3/rGO/SPEEK hybrid material: an excellent proton conductor

摘要

To improve the proton conductive performance of heteropoly acids, sulfonated polyether ether ketone (SPEEK) and reduced graphene oxide (rGO) were introduced into a tungstovanadophosphoric acid (H6PW9V3O40, abbreviated as PW9V3) to prepare a hybrid film material. The results indicate that the Keggin framework of the PW9V3O40 (6-) anion still remains in the hybrid material and confirm the homogeneous dispersion of PW9V3 on the surface of graphene sheets, which results in a better stability of PW9V3. The obtained PW9V3/rGO/SPEEK hybrid material exhibits appreciable proton conductivity of 6.2 x 10(-2) S cm(-1) at 17 degrees C and 70% relative humidity because the introduction of rGO and SPEEK into PW9V3 can help to form more hydrogen bonds in the HPA-based material. The conductivity of the PW9V3/rGO/SPEEK hybrid material enhances with the increase of temperature, and it shows Arrhenius behavior with the activation energy value of 18.7 kJ mol(-1), indicating that the proton conduction in this film occurs by a mixing mechanism. It is an alternative hybrid film material which may be applied in the field of proton exchange fuel cells.