Figure 3.

Kinetic analysis of Fe-based tetrapyrrole. (A) Structure of catalyst studied: iron phthalocyanine (FePc, A). (B) Apparent bicarbonate order dependencies at different voltages. (C) Apparent CO₂ order dependencies at different voltages. Points represent experimental data, and lines represent model fits. Error bars represent standard deviation with n ≥ 3. For all experiments, voltages reported vs SHE, total ionic strength held constant using NaClO₄, and CO₂ at 1 atm. (D) Mechanistic framework that can explain the kinetic observations. Salient phenomena at less reductive voltages are colored purple, and salient phenomena at more reductive voltages are displayed in yellow.