A Bifunctional CdS/MoO2/MoS2 Catalyst Enhances Photocatalytic H2 Evolution and Pyruvic Acid Synthesis

The best use of photogenerated electrons and holes is crucial to boosting photocatalytic activity. Herein, a bifunctional dual‐cocatalyst‐modified photocatalyst is constructed based on CdS/MoO2/MoS2 hollow spheres for hydrogen evolution coupled with selective pyruvic acid (PA) production from lactic...

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Published inAngewandte Chemie International Edition Vol. 61; no. 44; pp. e202212045 - n/a
Main Authors Bie, Chuanbiao, Zhu, Bicheng, Wang, Linxi, Yu, Huogen, Jiang, Chenhui, Chen, Tao, Yu, Jiaguo
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 02.11.2022
EditionInternational ed. in English
Subjects
Catalysts
Catalytic activity
CdS
Chemical synthesis
Conversion
Dual Cocatalysts
Electrons
Evolution
Hollow Sphere
Hydrogen bonds
Hydrogen Evolution
Hydrogen evolution reactions
Intermediates
Lactic acid
Molybdenum disulfide
Molybdenum oxides
Organic Synthesis
Oxidation
Photocatalysis
Pyruvic acid
Selectivity
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Summary:The best use of photogenerated electrons and holes is crucial to boosting photocatalytic activity. Herein, a bifunctional dual‐cocatalyst‐modified photocatalyst is constructed based on CdS/MoO2/MoS2 hollow spheres for hydrogen evolution coupled with selective pyruvic acid (PA) production from lactic acid (LA) oxidation. MoS2 and MoO2 are simultaneously obtained from the conversion of CdMoO4 in one step. In a photocatalytic process, the MoS2 and MoO2 function as the reduction and oxidation centers on which photogenerated electrons and holes accumulate and are used for hydrogen evolution reaction (HER) and PA synthesis, respectively. By monitoring the intermediates, a two‐step single‐electron route for PA production is proposed, initiated by the cleavage of the α‐C(sp3)−H bond in the LA. The conversion of LA and the selectivity of PA can reach ca. 29 % and 95 % after a five‐hour reaction, respectively. Photogenerated electrons and holes in CdS hollow spheres loaded with MoS2 and MoO2 dual cocatalysts are applied to hydrogen evolution and selective pyruvic acid production, respectively. This bifunctional strategy can fully utilize the redox abilities of photogenerated electrons and holes to enhance photocatalytic activity.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202212045