Figure 49.

Schematic representation of the electrochemical PCET model system of Hammes-Schiffer and co-workers. The filled circles represent the electrolyte ions in the solution. ϕ_M denotes the inner potential of the electrode, while ϕ_s(x) is the electrostatic potential in solution at a distance x from the metal surface. x_H locates the OHP. R denotes the proton donor–acceptor distance, which is denoted X throughout this review. Reprinted with permission from ref (357). Copyright 2008 American Chemical Society.