Issue 19, 2022

Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

Abstract

Semiconductors are usually employed to construct photocatalysts for hydrogen production, but bare semiconductors often suffer from a high recombination rate of charge carriers, resulting in low activity for proton reduction. Herein, CdS quantum dots (QDs) were anchored onto a tremella-like N-doped carbon (NC) support with trace ruthenium dispersed, to store and consume photo-excited electrons. The Ru/NC cocatalyst significantly enhances the interfacial transfer of electrons and facilitates proton reduction, leading to a decrease in the photoinduced charge recombination. The optimal Ru/NC/CdS-5 catalyst has a low Ru loading of 0.59 wt%, and it exhibits the highest photocatalytic activity with an H2 evolution rate of up to 73.6 mmol g−1 h−1, which is 21 times higher than that of bare CdS QDs (3.38 mmol g−1 h−1). The apparent quantum yield (AQY) of Ru/NC/CdS-5 under the same experimental conditions was found to be 3.6% under irradiation at 420 nm. The catalytic recycling test of Ru/NC/CdS-5 demonstrates its excellent stability. This work provides insight into the enhancement of the activity of semiconductors by dispersing a trace noble metal in a porous carbon support as a cocatalyst for proton reduction.

Graphical abstract: Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

Supplementary files

Article information

Article type
Research Article
Submitted
14 六月 2022
Accepted
06 八月 2022
First published
08 八月 2022

Inorg. Chem. Front., 2022,9, 4999-5007

Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

J. Xie, Y. Li, D. Nie, L. Wang, J. Chen, B. Li, J. He, Z. Guo and T. Lau, Inorg. Chem. Front., 2022, 9, 4999 DOI: 10.1039/D2QI01259F

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