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Spectral sensitization of sprayed thin filmn-ZnO electrodes by 4-p-dimethylaminobenzylidene-1,2-diphenyl-2-imidazoline-5-one in acetonitrile solution

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Abstract

A photoelectrochemical cell based on a thin filmn-ZnO electrode sensitized by 4-p-dimethylaminobenzylidene-1,2-diphenyl-2-imidazoline-5-one (subsequently referred to as 5-imidazolone) has been studied in acetonitrile medium using hydroquinone as supersensitizer. The redox behaviour of 5-imidazolone at Pt and ZnO electrodes has been studied in the same medium through cyclic voltammetry. The redox potentials of 5-imidazolone coupled with the flat-band potential of the ZnO electrode (obtained from the potential for photocurrent onset) have been used to determine their respective energy levels. Transient open circuit photovoltage-time profile and transient photocurrent-time profiles at fixed biased potentials have been recorded to determine the obtainable photovoltage and photoresponse behaviour of the ZnO electrode in the presence of 5-imidazolone. The quantum efficiency of the sensitized photocurrent was found to be ∼7% at 455 nm (λmax), the wavelength of monochromatic light. The long-term stability of the ZnO electrode in the medium of investigation was tested in the presence of this compound and was found to give a quite stable photocurrent for 10 h of continuous operation at lower light intensity. The power efficiency of ZnO/5-imidazolone in a acetonitrile/Pt photocell was also determined without any external applied potential.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Banaras Hindu University, 221005, Varanasi, India

    Lal Bahadur & J. P. Pandey

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  1. Lal Bahadur
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Bahadur, L., Pandey, J.P. Spectral sensitization of sprayed thin filmn-ZnO electrodes by 4-p-dimethylaminobenzylidene-1,2-diphenyl-2-imidazoline-5-one in acetonitrile solution. J Appl Electrochem 22, 883–887 (1992). https://doi.org/10.1007/BF01023734

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  • DOI: https://doi.org/10.1007/BF01023734

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