Figure 4

SEM images of Toray 090 (a–d) and BC 39 (e–h) corresponding to the cross section (a,e), gas diffusion layer (b,f), MPL (c,g), and MPL at higher magnification showing fibre size (d,h).

SEM images of Toray 090 (a–d) and BC 39 (e–h) corresponding to the cross section (a,e), gas diffusion layer (b,f), MPL (c,g), and MPL at higher magnification showing fibre size (d,h).