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Direct splitting of H2S into H2 and S on CdS-based photocatalyst under visible light irradiation

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Abstract.
The conversion of H2S into H2 and S (H2S → H2 + S) is beneficial from both environmental and energy
standpoints. Here we report that H2S can be splitted stoichiometrically into hydrogen and sulfur on CdSbased
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 S2−4 and S2−6 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 H2 via
photocatalysis.

Keywords:
Cadmium sulfide
Ethanolamine
Polysulfide
Hydrogen production
Hydrogen sulfide conversion
Photocatalysis
Electrochemistry

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 260 (2008) 134–140

Bahasa

English

ISBN/ISSN

00219517

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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