Proton conductivity and activation energy values of different composite membranes.

Membrane	Proton conductivity (mS cm−1) at 60 °C	Proton conductivity (mS cm−1) at 120 °C	Activation energy (kJ mol−1) under 100% RH	Activation energy (kJ mol−1) under 20% RH
Recast Nafion	68.53 ± 2	2.45 ± 0.4	14.73	26.52
Nafion/SGF-0.5	77.33 ± 4	4.58 ± 0.6	13.55	25.95
Nafion/SGF-1.5	86.66 ± 3	7.81 ± 0.4	12.05	23.21
Nafion/SGF-3	99.34 ± 4	11.62 ± 0.4	10.16	21.41
Nafion/GO-3	80.82 ± 2	5.61 ± 0.6	13.28	19.22