Mixed Potential, When a catalytic surface S is introduced into an aqueous solution containing ions and a reducing agent, the partial reaction of reduction [Eq. (8.4)] and the partial reaction of oxidation [Eq. (8.5)] occur simultaneously. Each of these partial reactions strives to establish its own equilibrium, The result of these processes is the creation of a steady state with a compromised potential called the steady-state mixed potential, E mp- The result of this mixed potential is that the potential of the redox couple Red/Ox [Eq. (8.5)] is raised anodically from the reversible value E eq,Red (Tig- 8.3), and the potential of the metal electrode M/M [Eq. (8.4)] is [Pg.142]

Despite the lack of theoretical models for interfacial recombination processes in excitonic solar cells, it is obvious empirically that those cells which function efficiently must have a very slow rate of recombination. In DSSCs, this can be explained simply by the slow electron self-exchange rate of the I /I2 redox couple and the absence of field-driven recombination. However, in the case of solid-state, high-surface-area OPV cells, such as the conducting polymer/C60-derivative cells [36,39], the slow rate of interfacial recombination is an important problem that is not yet understood. [Pg.78]

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