Figure 3
From: Layered SiC Sheets: A Potential Catalyst for Oxygen Reduction Reaction

Minimum energy pathways for ORR elemental steps in alkaline media on a single-layer SiC: (a) O2 + H2O → O + 2OH, (b) O + H2O → 2OH and (c) schematic energy profile.
IS, TS, MS and FS are initial, transition, metastable and final states, respectively. ⋆ denotes the TS in each step. Gray, gold, white and red colors denote C, Si, H and O atoms.