Abstract
A dressed-phonon–phonon (DPP) assisted photocatalyst reaction was carried out to increase the visible light responsibility, where the photon energy of the radiation, which ranged from visible to infrared light is less than band gap energy of the photocatalyst (ZnO, 3.3 eV). The dependence of the photocurrent on excitation power indicated that two-step excitation occurred in DPP-assisted process. A cathodoluminescence measurement also supported the conclusion that the visible- and infrared-light excitation originated from DPP excitation, not from defect states in the ZnO nanorod photocatalyst.
Highlights
A dressed-phonon–phonon (DPP) assisted photocatalyst reaction was carried out to increase the visible light responsibility, where the photon energy of the radiation, which ranged from visible to infrared light is less than band gap energy of the photocatalyst (ZnO, 3.3 eV)
We introduce a different approach to the visible light photocatalysis; the dressed-photon–phonon (DPP) assisted process[6]
T rEagTn; hseilet i6opnhjoEfrneoxo;mnp-hathossneiosgtnreioduotnwcdcous-trsastte,epH eEexgrc;eie,tla tt6ihoenjEkcthaeetnrmavblee; cpethoxorpnlao iEnngie;,dewl ahsicrfheoplilrsoewtshesen(tissneiettihaFeligs.teal1et)ec.,trItononathngerinofituresnrtmdsetsedtpiaat(teeI,),sattanhtdee jEthermal; phononi and jEex; phononi respectively represent the phonon excitation state that is determined by the crystal lattice temperature and the photon excitation state that is determined by the photon energy
Summary
Hydrogen has been attracting much interest as a clean energy source. For example, photo-electrolysis of water using photocatalysts such as TiO2 as the photoelectrode under solar light irradiation is a promising means of generating hydrogen without generating COx1. Propagating far-field light cannot excite electrons from the valence band to these phonon excited states, because these transitions are electric-dipole-forbidden. JEex; eli represents the electron excitation state, and jEex[0 ]; phononi represents the phonon excitation state Since this is an electric-dipole-allowed transition, the excitation occurs via the DPP and via propagating light. After this excitation, the phonon excitation state relaxes to a thermal equilibrium state with an occupation probability determined by the lattice temperature, and the process ends with excitation to the electron excitation state jEex; eli6jEthermal[0 ]; phononi. We applied the DPP-assisted process to the visible- and infrared-light photocatalytic reaction using a nano-structured photocatalytic electrode
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