Extended consumer/producer design pattern of the top level of the code and the block diagram of CheckVI.
Flow chart of the experimental procedure: (i) RHE measurement: The open circuit potential is measured in a H2-saturated solution with a rotation rate of 1600 rpm; (ii) Cleaning cycles: 25 cyclic voltammograms are recorded between +0.05 VRHE and +1.35 VRHE (scan rate: 0.05 V s−1) in Ar-atmosphere without rotation; (iii) ORR activity: 3 cyclic voltammograms for different rotation rates (400, 900, 1600, and 2500 rpm) each are recorded between +0.05 VRHE and +1.2 VRHE (scan rate: 0.05 V s−1) after saturation with O2; (iv) CO-stripping: After saturation with Ar, the solution is purged with CO while holding the potential at +0.05 VRHE for 7 min. Then, the solution is saturated with Ar by holding the same potential for 25 min. Finally, 3 cycles are recorded between +0.05 VRHE and +1.2 VRHE (scan rate: 0.05 V s−1); (v) Degradation cycles: Cycles between +0.4 VRHE and +1.4 VRHE (scan rate: 1 V s−1) are recorded in Ar-saturated solution. After a specific number of total cycles (360, 1080, 2160, 3600, 5400, and 7200 cycles), the CO-stripping procedure is repeated.
Development of the cyclic voltammograms (+0.4 VRHE to +1.4 VRHE, scan rate: 1 V s−1) during continuous degradation testing. Two neighboring CVs are spaced 180 cycles.
Normalized surface area vs. the number of cycles during the degradation procedure. The surface area was measured using the CO-stripping curves at specific number of cycles, as it is shown in the inset. The conditions are described in the caption of Fig. 2.
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