Figure 2
(a,b) SEM images of a Nafion membrane imprinted with a prism mould with a pitch of 20 μm (P-20 membrane) (a) and 50 μm (P-50 membrane) (b). (c,d) Stretching properties of the Nafion membranes: (c) strain–stress curves of the Nafion 212 membrane, 20 μm prism-patterned Nafion membrane, and 50 μm prism-patterned Nafion membrane measured by applying strain to the membranes (Inset: optical image showing the operation of the stretching machine); (d) ratio of height, width, and thickness changes of the Nafion membranes with varying strains (~0.5, ~1.0, and ~1.5).
