Photocatalytic Hydrogen Production with Cds and Cds/znS Modified by Different Electron Hole Transfer Additives Using Visible Light

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Authors

  • Department of Chemical Technology, Calcutta University, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 ,IN
  • Department of Chemical Technology, Calcutta University, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 ,IN

DOI:

https://doi.org/10.18311/jsst/1999/2075

Keywords:

Hydrogen Production, CdS Semiconductor, Mixed Semiconductor, Electron-Hole Transfer, Photoelectro-Chemical Cell.

Abstract

Photocatalytic production of hydrogen using CdS suspensions in aqueous solution containing Na2S-Na2SO3 has been studied. CdS prepared from different salts of Cd(II) and Na2S or H2S shows different photocatalytic activity towards generation of hydrogen. Use of excess of Cd2+ or S2- in the preparation of CdS affects its photocatlytic activity. Pt, Pd, Ag2S or RuO2 have been added to CdS in different proportions. In each case, a maximum hydrogen production is observed at a definite composition. In case of CdS/ZnS mixture, the intimate contact of Pt with CdS is absolutely necessaly in exerting the role of Pt for enhancing the hydrogen evolution by the ternary semiconductor system. Attempt has been made to correlate the photocatalytic activity order of the semiconductors to their luminescence property.