Fig. 5: Comparison of channel and land area.

Relative change in intensity at different current densities compared to open circuit in a cathode flow field land area, and b cathode flow field channel area. A value larger than one indicates less water/KHCO3 and a value below one more water/KHCO3, as compared to the zero current reference. See Supplementary Fig. 5 for selected regions. Source data are provided as a Source Data file.