Abstract
The photoelectrocatalytic effect for the reduction of CO 2 mediated with methylviologen (MV) was studied at mercury, polished silver and roughened silver electrodes using electrochemical and surface-enhanced Raman scattering (SERS) techniques. A large photoelectrocatalytic effect for the reduction of CO 2 in the presence of MV was observed at the roughened silver electrode, whereas there was only a very small photoelectrocatalytic current at a more negative potential on mercury and polished silver electrodes. The SERS spectra of MV in the presence and absence of CO 2, along with the electrochemical results, demonstrate that the surface adsorbed complexes, MV + –Ag and MV 0–Ag, played a role as the mediator for photoinduced electron transfer to CO 2 in the solution. The results also suggest that the surface plasmon resonance of the nanoscale silver particle contributes to the overall photoelectrocatalytic effect on a roughened silver electrode.
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