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Direct measurement of the cathode catalyst layer thickness on an MEA with Fe/N/CF loading of 2 mg⋅cm−2. The ratio of I/C = 1/1. The sampling locations included the MEA's center, the edge, and the spots between the center and the edge. The average thickness of catalyst layer was 30 μm. The calculated gravimetric density was 0.66 gcatalyst⋅cm−3.
