Presentation Information
[17p-P02-9]Development of sulphonated graphene oxide and sulphonated PVDF membranes for fuel cells
〇(D)Gagan Kumar Bhatt1, Chellamuthu Jegannathan1, Masanori Hara1, Masamichi Yoshimura1 (1.Toyota Tech. Inst.)
Keywords:
membranes,Fuel cells
New membrane with high proton conductivity, high water uptake capacity and good thermal stability is required to make cost effective fuel cells. Herein, we synthesized sulphonated graphene oxide (SGO)[1] and sulphonated PVDF (S-PVDF) composite membranes with high proton conductivity and thermally stability.
To synthesize SGO, first graphene oxide (GO) was functionalized with sulphonate group using H2SO4. H2SO4 was added in different amount to make and refluxed at 25 °C for 3 hours and 100° C for the next 3 hours. The prepared SGO was analysed using Raman and XPS. We observed the D/G ratio increases with the increase in sulphonation. In XPS we observed clear S2p peak with SGO which was not observed in GO indicating the successful sulphonation of GO. PVDF was sulphonated using chlorosulphonic acid by magnetic stirring at 80° C. For fabrication of membranes, 1-4 wt% of SGO was sonicated in 10 ml of DMF and 1g of sulphonated PVDF (S-PVDF) was mixed with 10 ml of DMF in a separate beaker, both the solutions are mixed and stirred for 3 hours. The solution is then casted into a petri dish and put in vacuum oven to get SGO-SPVDF composite film. The surface morphology of synthesised GO was studied using SEM and AFM and we observe some fibre like structure present in GO which were not present in pristine PVDF membrane. The occurrence of fibre like structure confirms the integration of GO in the composite membranes. The performance of the composite membrane was studied for proton conductivity and thermal stability. The proton conductivity of PVDF membrane was increased to 0.22 mS/cm after addition of GO and further increase to 2 mS/cm after addition of SGO to PVDF as shown in Fig.1(a). We measured thermal stability of the membranes by TGA-DTA measurement and observed that with increasing sulphonation of PVDF the thermal stability of membranes decreases as compared to PVDF as shown in Fig.1(b).
To synthesize SGO, first graphene oxide (GO) was functionalized with sulphonate group using H2SO4. H2SO4 was added in different amount to make and refluxed at 25 °C for 3 hours and 100° C for the next 3 hours. The prepared SGO was analysed using Raman and XPS. We observed the D/G ratio increases with the increase in sulphonation. In XPS we observed clear S2p peak with SGO which was not observed in GO indicating the successful sulphonation of GO. PVDF was sulphonated using chlorosulphonic acid by magnetic stirring at 80° C. For fabrication of membranes, 1-4 wt% of SGO was sonicated in 10 ml of DMF and 1g of sulphonated PVDF (S-PVDF) was mixed with 10 ml of DMF in a separate beaker, both the solutions are mixed and stirred for 3 hours. The solution is then casted into a petri dish and put in vacuum oven to get SGO-SPVDF composite film. The surface morphology of synthesised GO was studied using SEM and AFM and we observe some fibre like structure present in GO which were not present in pristine PVDF membrane. The occurrence of fibre like structure confirms the integration of GO in the composite membranes. The performance of the composite membrane was studied for proton conductivity and thermal stability. The proton conductivity of PVDF membrane was increased to 0.22 mS/cm after addition of GO and further increase to 2 mS/cm after addition of SGO to PVDF as shown in Fig.1(a). We measured thermal stability of the membranes by TGA-DTA measurement and observed that with increasing sulphonation of PVDF the thermal stability of membranes decreases as compared to PVDF as shown in Fig.1(b).
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