講演情報
[17a-P01-29]Enhancement of proton conductivity and water uptake capacity in sulfonated PVDF and sulfonated graphene oxide composite membranes for fuel cells
〇(DC)Gagan Kumar Bhatt1, Chellamuthu Jegannathan1, Chinnaswamy Sengottaiyan1, Beshoy Nasr1, Masanori Hara1, Masamichi Yoshimura1 (1.Toyota Technological Inst.)
キーワード：
Fuel cells、Proton Exchange Membrane
Membranes with high proton conductivity, water uptake capacity and thermal stability are highly desirable for developing cost effective fuel cells. This study examines the effect of degree of sulfonation of polyvinylidene fluoride (PVDF)1 and graphene oxide (GO)2 on the performance of proton exchange membranes (PEM).
Two series of membranes were synthesized using solution casting method: the first series varying the sulfur content in sulfonated PVDF (SPVDF), and the second incorporating sulfonated graphene oxide (SGO) fillers into SPVDF. The fabricated membrane with a higher degree of sulfonation and SGO fillers demonstrated a 20-fold increase in proton conductivity (10.8 mS/cm at 70°C and 40% relative humidity) and significantly higher water uptake capacity (16.5% at 90°C) as compared to the less sulfonated PVDF as depicted in Fig. 1(a,b). We analysed the thermal stability of the membranes by TGA-DTA measurement and observed that with increasing sulfonation of PVDF, the thermal stability of membranes decreases as compared to PVDF as shown in Fig. 1(c). The enhanced performance of membranes at high temperatures makes them a competitive alternative for use as a PEM in fuel cells.
Two series of membranes were synthesized using solution casting method: the first series varying the sulfur content in sulfonated PVDF (SPVDF), and the second incorporating sulfonated graphene oxide (SGO) fillers into SPVDF. The fabricated membrane with a higher degree of sulfonation and SGO fillers demonstrated a 20-fold increase in proton conductivity (10.8 mS/cm at 70°C and 40% relative humidity) and significantly higher water uptake capacity (16.5% at 90°C) as compared to the less sulfonated PVDF as depicted in Fig. 1(a,b). We analysed the thermal stability of the membranes by TGA-DTA measurement and observed that with increasing sulfonation of PVDF, the thermal stability of membranes decreases as compared to PVDF as shown in Fig. 1(c). The enhanced performance of membranes at high temperatures makes them a competitive alternative for use as a PEM in fuel cells.