Photochemical modulation of electrocatalytic processes

Modulation of the electrocatalytic response by electrochemically or photochemically induced changes in the electroactive centers anchored to porous solids is another possibility in photoelectrochemistry. This can be illustrated by the voltammetric 

FIG U RE 11.15 Main photoelectrochemical processes involved in the voltammetric response of SP Y systems. (From Domenech et al., 2004. J. Phys. Chem. B. 108, 20064-20075, with permission.) 

Electrochemical data for SP Y probes were consistent with these above considerations (Domenech et al., 2004e). For our purposes, the relevant point to emphasize is that a light-sensitive effect on the voltammetric response for benzidine oxidation 

FIGURE 11.16 CVs at paraffin-impregnated graphite electrodes modified by (a) bleached SP Y, (b) partly bleached SP Y, and (c) pristine SP Y, immersed into 3.0 mM N,N,N, N -tetramehylbenzidine solution in 0.10 M Id N( I(J MeCN. Potential scan rate 100 mV/sec. (From Domenech et al. 2004. J. Phys. Chem. B. 108, 20064-20075, with permission.) 

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