[14a-B309-1~10] 3.12 Nanoscale optical science and near-field optics

△ [14a-B309-5] Unique Isotopic Selectivity of Hydrogen Evolution Reaction at Plasmonic Electrodes

〇Hiro Minamimoto¹, Daiki Sato¹, Murakoshi Kei¹ (1.Hokkaido Univ.)

Keywords:Hydrogen Evolution Reaction, Plasmon-Induced Charge Transfer, Photoelectrochemistry

The efficient control of the visible light driven chemical reaction can be recognized as the one of the important challenge for the sustainable society. Recently, the combination of plasmoic metal nano-structures with the wide-semiconductor substrate has been received much attention because of the visible light response characters beyond the limitation of the semiconductor. In the general type of the plasmon-induced charge transfer process, the electrons excited in the metal structures are injected into the conduction band of the n-type semiconductor and the remained holes are used for the oxidation reaction. Although, various plasmon-induced chemical reactions, even the water splitting, have been established, the direct control of the reduction reaction at the metal-semiconductor interface by the excited electrons has not been well examined yet. In this study, we have tried to establish the nwe plasmon-induced hydrogen evolution system by the introduction of the plasmon-active metal nano-structures into the p-type semiconductor substrate. In addition to this, we have also investigated the isotopic effect on the hydrogen evolution reaction to clarify the unique surface molecular process. Through the various photoelectrochemical measurements and the theoretical estimations, we have confirmed that our plasmonic hydrogen evolution system shows very unique isotopic selectivity and the surface molecular process.