Photoelectrochemistry of porous p-Cu2 O films

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Porous p- Cu2 O films were prepared on transparent conductive glass from a dispersion of Cu2 O powder in ethanol. Upon illumination with a 100 W tungsten lamp, the photocurrent of the porous Cu2 O film was appreciably greater when compared to electrodeposited Cu2 O films. The enhancement is attributed to the increased interfacial area between the film and the solution due to the three-dimensional nature of the Cu2 O film. No chemical change was detected by visual examination and X-ray diffraction of the porous Cu2 O film after illumination for 2 h in the aqueous solution at -0.4 V vs saturated calomel electrode. The reported stability of electrodeposited Cu2 O films is attributed to the effect of Cu+ -terminated (111) surface, where the H+ -assisted photoreduction of Cu2 O is less likely to occur. The well-known instability of single-crystal Cu2 O is hypothesized to be due to the predominating (211) and (311) surfaces, where the photodecomposition to Cu is inevitable at the exposed O2- sites. © 2008 The Electrochemical Society.

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Journal of the Electrochemical Society

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