Near-field assisted visible- and infrared-light water splitting
To improve the efficiency of solar light utilization for water splitting, an optical near-field (ONF)-assisted photocatalyst reaction was carried out with a ZnO photocatalyst. The dependence of the photocurrent on the excitation power indicated that two-step visible light excitation occurred in a ONF-assisted process. A photoluminescence measurement also supported the conclusion that the visible light excitation originated from ONF excitation, not from defect states in the ZnO nanorod photocatalyst. This phonon-assisted excitation process can be applied not only for ZnO but also for other semiconductor materials, which will allow higher efficiency of hydrogen generation using sunlight to be realized.
- T. Yatsui, T. Imoto, T. Mochizuki, K. Kitamura, and T. Kawazoe, “Dressed-photon–phonon (DPP)-assisted visible- and infrared-light water splitting,” Scientific Reports, Vol. 4, April 2014, Article number: 4561, doi:10.1038/srep04561 (5 pages)
- H.H. Le, K. Mawatari, Y. Pihosh, T. Kawazoe, T. Yatsui, M. Ohtsu, and T. Kitamori, “Novel Sub-100 nm Surface Chemical Modification by Optical Near-field Induced Photocatalytic Reaction,” Microfluidics and Nanofluidics, Volume 17, Issue 4, October 2014, pp. 751-758, DOI:10.1007/s10404-014-1361-7
- T. H. H. Le, K. Mawatari, Y. Pihosh, T. Kawazoe, T. Yatsui, M. Ohtsu, M. Tosa, and T. Kitamori, “Optical near-field induced visible response photoelectrochemical water splitting on nanorod TiO2,” Appl. Phys. Lett., Vol. 99, Issue 21, November 2011, 213105 (3 pages) (selected for Virtual Journal of Nanoscale Science & Technology — December 5, 2011, Volume 24, Issue 23).