Reversed photoresponse: Indium tin oxide (ITO)/Au nanoparticle (NP)/TiO(2) electrodes (see picture) exhibit cathodic photocurrents and positive photopotentials under visible light, whereas ITO/TiO(2)/Au NP electrodes show an inverted response. This behavior indicates that electron transfer occurs from the plasmon-excited Au NPs to the TiO(2) film. An enhanced O(2) photoreduction activity is found for ITO/Au NP/TiO(2)/Pt electrodes.
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