Photogalvanovoltaic Cells and Photovoltaic Cells using Glassy Carbon Electrodes
Numerous electrochemical photocells have been proposed for the direct conversion of solar energy to electricity or chemical fuel. These cells, on the basis of two well established photoelectric effects, can be classified as either photovoltaic (PV) or photogalvanic (PG). The operation of a PV cell depends on the generation of an EMF as a result of the absorption of light, whereas the operation of a PG cell relies on the excitation by light of photoactive species in solution which induces a Faradaic process at the electrode. This paper describes a new type of electrochemical photocell, the operation of which is based on the combined principles of the PV and PG phenomena. This system, having the advantages of both the PV and PG cell, is therefore called the photogalvanovoltaic (PGV) cell. The key element of the cell responsible for the PV effect is a porphyrin-coated glassy carbon electrode. Either Pt or glassy carbon can serve as the counter electrode. The results of an electrochemical PV cell using porphyrin-coated glassy carbon electrodes are also described.
KeywordsCholesterol Graphite Chlorophyll Platinum Tungsten
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