Excitation of localized surface plasmon resonance (LSPR) at Au metal nanoparticle on TiO<sub>2</sub> enable efficient water oxidation even under near-infrared light illumination. In this work, we observed plasmon-induced water oxidation process using in-situ surface enhanced Raman scattering (SERS) measurement. Size-controlled Au nanodimer arrays was fabricated on titanium dioxide single crystalline by angle-resolved nanosphere lithography. The Au - O stretching vibrations of Au oxide was observed from the intermediate of water oxidation. The formation of the intermediate at relatively negative potential is attributed to the water oxidation process via holes generated by LSPR. We concluded that different mechanisms exist for water oxidation on plasmonic electrode, compared with that at bulk Au electrode.

Characteristics of reaction intermediates at plasmon-induced water oxidation processes

249th National Meeting (2015)

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