Fig. 4: Ionomer distribution of catalyst layers. | Nature Communications

Fig. 4: Ionomer distribution of catalyst layers.

From: Ionomer distribution control via thiophene S-modification of carbon support for high-power proton exchange membrane fuel cells

Fig. 4

Slice-STEM EDX mapping of Pt3Co/KB CL (a, b) and Pt3Co/S-KB (f, g). All the samples were made by embedded and sliced the MEAs. The element distribution of Pt (red) and F (yellow) represents the distribution of the catalysts and Nafion ionomer, respectively. The orange dashed frames mark a large number of ionomers here without platinum in the Pt3Co/KB catalyst layer. FIB-STEM-EDX mapping of Pt3Co/KB (c, d) and Pt3Co/S-KB (h, i) CLs. All the samples were cut by FIB from MEAs’ cathode side. The element distribution of Pt (red) and F (yellow) represents the distribution of the catalysts and Nafion ionomer, respectively. The orange dashed circles mark the aggregation of ionomer in the Pt3Co/KB CL. The schematic diagram of ionomer and mass transport processes in the catalytic layers of Pt3Co/KB (e) and Pt3Co/S-KB (j).

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