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. Author manuscript; available in PMC: 2013 Oct 29.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2011 Jul 12;115(32):10.1021/jp2042526. doi: 10.1021/jp2042526

Figure 2. Normalized ORR-activity and bulk iron content of acid-washed catalysts vs. immersion time in a pH 1 H2SO4-solution.

Figure 2

(A) The original catalyst (O-catalyst) was immersed for a time t (x-axis) in a pH 1 H2SO4-solution, then filtered, rinsed with deionized water and dried overnight in an oven at 80°C. Then, an ink was made with the acid-washed catalyst, an aliquot of the ink was deposited on the glassy carbon and the activity measured by RDE in a pH 1 H2SO4-electrolyte. The normalized activity is based on that of the original catalyst, which was 2.8 ± 0.6 Ag-1.

(B) The bulk iron content was measured by neutron activation analysis and the error is 5 %.