Figure 2 (IMAGE)

Advanced Institute for Materials Research (AIMR), Tohoku University

Figure 2

Caption

Understanding the catalytic activity and stability of Ir/HESIO. (a) Calculated one-dimensional (1D) surface Pourbaix diagram showing how surface stability changes with electrical potential versus the reversible hydrogen electrode (RHE) at 298.15 K. (b) Two-dimensional (2D) surface Pourbaix diagram showing the effects of electrical potential and pH on the Ir/HESIO surface at 298.15 K. (c) Projected density of states (PDOS) showing the electronic properties of iridium under different surface conditions. The Fermi level is set to zero. (d) Microkinetic volcano plot comparing the predicted activity of different catalysts for the oxygen evolution reaction (OER) at a current density of 1 μA/cm². The insets show the surface models used in the calculations. (e) Changes in Gibbs free energy during progressive overoxidation of iridium in the Ir/IrO₂ and Ir/HESIO models.

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Hao Li

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