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 2-x 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.
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Lee, S.G., Kim, JH., Lee, S. et al. Photochemical production of hydrogen from alkaline solution containing polysulfide dyes. Korean J. Chem. Eng. 18, 894–897 (2001). https://doi.org/10.1007/BF02705614
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DOI: https://doi.org/10.1007/BF02705614