Figure 3.

Determination of U values under various conditions of in situ SD quantification. (a) U, Δj/jpristine, and ΔCCN–electrolyte values estimated at different Ethird values applied on the working electrode. (b) Fraction of ferric and ferrous ions of Fe0.5NC at various potentials, fitted from the Fe K-edge in situ XANES spectra (Figure S4b). (c) U, Δj/jpristine, and ΔCCN– values estimated at different initial CCN–electrolyte values in the working electrode compartment. (d) Comparison of the U values of Fe0.5NC measured by the cyanide-poisoning in situ SD quantification, gas-phase CO chemisorption, and electrochemical NO2–-stripping methods.31,33