<span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family: "Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:Arial;mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">Spectral sensitization of sprayed <i style="mso-bidi-font-style:normal">n</i>-ZnO electrode by rose bengal in non-aqueous photoelectrochemical cell</span>

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Photosensitizing ability of rose bengal was studied at semiconducting <i style="mso-bidi-font-style:normal">n</i>-ZnO electrode in acetonitrile medium using hydroquinone as supersensitizer. In order to ascertain the exclusive effect of dye sensitization on photocurrent at ZnO electrode, studies have been conducted under filtered light (λ &gt; 420 nm) illumination also. Energy level diagram was constructed using redox potentials of rose bengal determined from cyclic voltammetric studies (reduction potential = -0077 V and oxidation potential = + 0.93 V vs SSCE), coupled with the flat-band potential of Zno electrode (V_fb = -0.60±0.02 V vs SSCE) determined through i_photo-<i style="mso-bidi-font-style:normal">V</i> curve and redox potential of quinone/hydroquinone (0.45 V). The results indicated that rose Bengal can act as donor as well as acceptor type dye The quantum efficiency of dye-sensitized photocurrent was found to be ~78%. Long-term stability experiments.</span>