Fig. 3: Catalytic performance and quantitative analysis.
From: Near-100% site utilization of single atoms for efficient electrocatalysis
a ORR polarization curves of Pt/C, NC, 3D FeNC, and 2D FeNC and b 2D FeNC_Sx with different SDS contents. c ORR polarization curves and d CV curves of 2D FeNC and 3D FeNC during nitrite stripping protocol (unpoisoned, poisoned, and recovered states). Insets in (d): charge quantification for nitrite reduction on Fe SAs. e SDmass and Usite comparisons across catalysts. f Comparison of TOF and SDmass across catalysts. g Schematic of SECM setup. h, i SECM mapping at 0.4 V vs. RHE for (h) 2D FeNC and (i) 3D FeNC. j Tip-recorded charges and SI-SECM-derived SDmass for 2D FeNC and 3D FeNC.
