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Korean Journal of Chemical Engineering

, Volume 18, Issue 6, pp 894–897 | Cite as

Photochemical production of hydrogen from alkaline solution containing polysulfide dyes

  • Sang Gi Lee
  • Jae-Hyun Kim
  • Sangwha Lee
  • Ho-In Lee
Article
  • 70 Downloads

Abstract

Efficient hydrogen production was achieved by irradiating solutions containing polysulfide dyes as a photoabsorber. In the presence of polysulfide only, considerable amount of hydrogen was initially evolved and followed by the rapid decrease of the evolution rate. On the contrary, in the co-presence of NiOxx< l/TiO2 and polysulfide, steady evolution of hydrogen was observed even after long period of illumination. The photocatalytic evolution of hydrogen was divided into two stages: i) in the first stage within 1 hour irradiation, the hydrogen evolution rate was abruptly increased due to the conversion of polysulfide to partially oxidized sulfur, S2O x 2- ii) in the secondary stage after 1 hour irradiation, steady evolution of hydrogen was observed due to the conversion of partially oxidized sulfur to fully oxidized sulfur. The oxidation/reduction of sulfur occurred more favorably over SiC catalyst where more steady evolution of hydrogen was achieved.

Key words

Hole Scavenger Polysulfide NiO/TiO2 SiC Hydrogen Evolution 

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Copyright information

© Korean Institute of Chemical Engineering 2001

Authors and Affiliations

  • Sang Gi Lee
    • 1
    • 2
  • Jae-Hyun Kim
    • 1
  • Sangwha Lee
    • 1
    • 3
  • Ho-In Lee
    • 1
  1. 1.School of Chemical EngineeringSeoul National UniversitySeoulKorea
  2. 2.LG Chemical Ltd.DaejeonKorea
  3. 3.Department of Chemical EngineeringKyungwon UniversityKyonggi-doKorea

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