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Preprints Archive: Abstract of IC2010045 (2010)

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Surface modification of semiconductor photo electrochemical solar cell for improved solar cell performance

by Mridula Tripathi, Ruby Upadhyay, Shiv Datt Kumar and Kamlesh Pandey

Document info: Pages 14, Figures 6.

In the present paper, photo-electro chemical and hydrogen evolution characteristics of a new type of $TiO_2(ns)$ and $TiO_2(ns)-WO_3$ admixed/ $Ti$ septum based semiconductor-septum photo electrochemical (SC-SEP, PEC) solar cell have been studied. The SC-SEP cell in the configuration of $SCE/1 M ~NaOH /TiO_2 (ns)/Ti/H_2SO_4 + K_2SO_4/Pt_{CE}, Pt_{WE}$ showed the photo voltage and photo-current of $0.72 ~V$ and $8.6 ~mA/cm^2$, whereas the SC-SEP cell employing $WO_3$ admixed $TiO2(ns)$ photoelectrode and having the configuration: $SCE/$ $1M NaOH/TiO_2 (ns)-WO_3/Ti/H_2SO_4 + K_2SO_4/Pt_{CE},Pt_{WE}$, showed the photo-voltage and photo-current of $0.96$ $V$ and $15.6$ $mA/cm^2$ respectively. The hydrogen gas evolution for the $SC-SEP$ cell based on $TiO_2(ns)$ $/Ti$ photoelectrode was found to be $8.2$ $l/h/m^2$, on the other hand the $WO_3$ modified $TiO_2(ns)$ exhibited a higher hydrogen gas evolution rate of $13.8$ $l/h/m^2$. The better performance of the new photoelectrode is thought to be due to improved spectral response and catalytic activity of $WO_3$ for the hydrogen gas evolution kinetics.

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