1. Institute of Industrial Science, The University of Tokyo, 4‐6‐1 Komaba, Meguro‐ku, Tokyo 153‐8505 (Japan), Fax: (+81)?3‐5452‐6338;2. PRESTO, Japan Science and Technology Agency (JST), 4‐1‐8 Honcho, Kawaguchi, Saitama 332‐0012 (Japan)
Abstract:
Reversed photoresponse: Indium tin oxide (ITO)/Au nanoparticle (NP)/TiO2 electrodes (see picture) exhibit cathodic photocurrents and positive photopotentials under visible light, whereas ITO/TiO2/Au NP electrodes show an inverted response. This behavior indicates that electron transfer occurs from the plasmon‐excited Au NPs to the TiO2 film. An enhanced O2 photoreduction activity is found for ITO/Au NP/TiO2/Pt electrodes.