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Graphite photoelectrochemistry 2. Photoelectrochemical studies of highly oriented pyrolitic graphite by Alexander D Modestov; Jenny Gun; Ovadia Lev is a Engineering article available to read on EtoBox.

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Photoelectrochemical reduction of oxygen and other observations of sustained electrochemically generated photocurrents with graphitic (HOPG) electrodes in aqueous solutions are reported. The photocurrents were observed over a wide pH range: 0 (0.5 M H 2 SO 4 )-14 (1 M NaOH). Photocurrent-potential, capacitance-potential and photocurrent light action spectral measurements were performed with basal plane and edge plane HOPG electrodes in order to elucidate the origin of the observed photocurrent. The photocurrent is attributed to hot electron-hot hole pairs photogenerated by direct transition between p-electronic states of the valence and conduction bands of graphite. Photogenerated carriers, holes or electrons, are driven by the electric field in the space charge layer (scl) to the electrode electrolyte interface, where they react directly with species in the electrolyte inducing anodic or cathodic photocurrent. The potential corresponding to the change of the photocurrent sign from cathodic to anodic was attributed to the flat band potential (E FB ). The E FB of the basal plane electrode was 0 V versus SHE regardless of pH, while for the edge plane electrode E FB changed at a rate

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Author

Alexander D Modestov; Jenny Gun; Ovadia Lev

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)