Dynamics of Interfacial Electron Transfer from Betanin to Nanocrystalline TiO2: The Pursuit of Two-Electron Injection
作者： Fritz J. Knorr , Jeanne L. McHale , Aurora E. Clark , Arianna Marchioro , Jacques-E. Moser
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摘要: We report spectroelectrochemical and transient absorption spectroscopic studies of electron injection from the plant pigment betanin (Bt) to nanocrystalline TiO2. Spectroelectrochemical experiments density functional theory (DFT) calculations are used interpret data in terms excited state Bt ground oxidation intermediates products. Comparison amplitudes signals on TiO2 ZrO2, for which no takes place, reveals signature two-electron electronically Transient observed (in contrast ZrO2) nanosecond time scale reveal spectral signatures photo-oxidation products absorbing red blue. These assigned a one-electron product formed by recombination injected electrons with product. conclude that whereas is simultaneous two-el...
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