A Bifunctional CdS/MoO2/MoS2 Catalyst Enhances Photocatalytic H2 Evolution and Pyruvic Acid Synthesis
A Bifunctional CdS/MoO2/MoS2 Catalyst Enhances Photocatalytic H2 Evolution and Pyruvic Acid Synthesis
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双功能 CdS/MoO2/MoS2 催化剂增强光催化产氢和丙酮酸合成
DOI：
10.1002/anie.202212045
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发表时间：
2022-10-05
影响因子：
16.6
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Bie, Chuanbiao;Zhu, Bicheng;Yu, Jiaguo
光生电子和空穴的最佳利用对于提高光催化活性至关重要。本文基于CdS/MoO 2/MoS 2空心球构建了一种双功能双助催化剂改性的光催化剂，用于析氢和选择性氧化乳酸（LA）制备乳酸（PA）。由CdMoO 4一步转化同时得到MoS 2和MoO 2。在光催化过程中，MoS 2和MoO 2作为还原和氧化中心，光生电子和空穴在其上积累并分别用于析氢反应（HER）和PA合成。通过监测中间体，提出了一种两步单电子PA生产路线，由LA中的α-C（sp（3））-H键的断裂引发。LA的转化率和PA的选择性可达约100%。反应5小时后分别为29%和95%。
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 alpha-C(sp(3))-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.