We coated an indium-tin oxide transparent electrode with a titanium oxide thin film. We deposited a hexagonal array of small plasmonic gold nanoparticles on the titanium oxide film, followed by deposition of cocatalysts such as platinum nanoparticles. This working electrode was connected with a counter electrode such as a platinum wire and those electrodes were immersed in an electrolyte solution containing an electron donor such as methanol. The working electrode was irradiated with visible light, and hydrogen was evolved at the counter electrode even without bias voltage application, although the hydrogen evolution rate was enhanced when a bias voltage was applied. We will report optimization of the cocatalyst systems.
1. Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005).
2 . T. Tatsuma, Bull. Chem. Soc. Jpn., 86, 1 (2013) [account].
3. T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., in press (doi: 10.1039/C7SC00031F) [review].
4. E. Kazuma and T. Tatsuma, Adv. Mater. Interfaces, 1, 1400066 (2014).
5. H. Nishi and T. Tatsuma, Angew. Chem. Int. Ed., 55, 10771 (2016).
6. K. Saito, I. Tanabe, and T. Tatsuma, J. Phys. Chem. Lett., 7, 4363 (2016).