PMC

Left: The cumulative number of survived activities, N(t), i.e. the number of activities present at time t in Rome, is plotted as a function of time t (expressed in calendar years). The inset shows the number n(t) of new registered activities at each year. Right: The number n^α(t) of new activities is reported as a function of the year t, for a selection of the commercial categories reported in , i.e. Food, Medicals, Goods and Repair.

Left: The cumulative number of survived activities, N(t), i.e. the number of activities present at time t in Rome, is plotted as a function of time t (expressed in calendar years). The inset shows the number n(t) of new registered activities at each year. Right: The number n^α(t) of new activities is reported as a function of the year t, for a selection of the commercial categories reported in Table 1, i.e. Food, Medicals, Goods and Repair.

(A) CV curves of Pd-Ni/C and the commercial Pd/C recorded in 1 M KOH solution at a scan rate of 100 mV s⁻¹. (B) ORR polarization curves of Pd-Ni/C and the commercial Pd/C recorded in O₂-saturated 0.1 M KOH solution at a scan rate of 10 mV s⁻¹ and a rotation rate of 1600 rpm. (C) Comparison of specific activities at 0.9 V versus RHE for these catalysts. (D) Comparison of mass activities at 0.9 V versus RHE for these catalysts and the commercial Pt/C. The activities were calculated on the basis of five independent measurements.

ORR Performance of the Commercial Pt/C at 0.9 V and 0.854 V with Different Mass Loadings.
(A) CV curves of the commercial Pt/C with different mass loadings.
(B) ORR polarization curves for commercial Pt/C with iR-drop correction.
(C and D) (C) Specific and (D) mass ORR activities for commercial Pt/C catalysts at the potential of 0.9 V versus RHE.
(E and F) (E) Specific and (F) mass ORR activities for commercial Pt/C catalyst with various mass loading at the potential of 0.854 V versus RHE
(G and H) Comparison of (G) specific and (H) mass ORR activities of the catalysts at different potentials as 0.854 V and 0.9 V versus RHE. Error bars represent one standard deviation of multiple independent measurements.