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Trends in Electrocatalytic Activity The Limiting Potential Map

Consider a reduction reaction like the ORR, where electrons are transferred from the snrface to the reactant (this corresponds to a + sign in Equation (11.8) and a - sign in Equation (11.9)). The minimum of the (7. s for the elementary steps making up the reaction defines the potential where all steps are exergonic, and this potential is termed the limiting potential for the reaction [Pg.169]

Likewise, for an oxidation reaction like the OER, the maximum value of for which aU reaction steps are exergonic will define the limiting potential for the full reaction  [Pg.169]

Note that this is not the same as the measured overpotential (Eq. 11.7), which depends on the current density. However, is a measure of the activity and has been found [Pg.169]

Because of the scaling relations, each of the reaction free energies in the ORR will scale with the O or the OH adsorption energy. That means that we can define the limiting potential for each step as a function of the OH adsorption energy  [Pg.169]

FIGURE 11.16 Scaling relation between the OOH and OH adsorption energy on different metals (left) and metal oxides (right). Adapted from Viswanathan et al. (2012) and Man et al. (2011). [Pg.170]


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