期刊
JOURNAL OF CATALYSIS
卷 260, 期 1, 页码 134-140出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2008.09.017
关键词
Cadmium sulfide; Ethanolamine; Polysulfide; Hydrogen production; Hydrogen sulfide conversion; Photocatalysis; Electrochemistry
资金
- National Natural Science Foundation of China [20503034, 673112]
- National Basic Research Program of China [2003CB214504]
- Chinese Academy of Sciences
- DICP [K2006E2]
- Programme for Strategic Scientific Alliances between China and the Netherlands [2008KR0531]
The conversion of H2S into H-2 and S (H2S -> H-2 + S) is beneficial from both environmental and energy standpoints. Here we report that H2S can be splitted stoichiometrically into hydrogen and sulfur on CdS-based photocatalysts under visible light irradiation using ethanolamine as a H2S solvent and reaction media at room temperature. Raman spectra showed that the produced sulfur existed as S-4(2-) and S-6(2-) after photocatalytic reaction. The hydroxyls of the reaction media were found to be crucial for the hydrogen production, and the rate-determining step (RDS) of photocatalytic splitting H2S in diethanolamine is discussed. Electrochemical evaluation showed that the potential of H2S splitting in ethanolamine was greatly lowered and the photogenerated electrons could be fully used to reduce protons for hydrogen production. A free-radical-related one-electron electrochemical oxidation process on platinum electrode is suggested. This work demonstrates the possibility of the direct splitting H2S into S and H-2 via photocatalysis. (C) 2008 Elsevier Inc. All rights reserved.
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