Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 46, Issue -, Pages 1-7Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2019.10.004
Keywords
Syngas; CO2 reduction; Layered double hydroxide; Visible light
Funding
- Fundamental Research Funds for the Central Universities [XK1802-6, XK1902, XK1803-05, 12060093063, 2312018RC07]
- National Natural Science Foundation of China [U1707603, 21878008, 21625101, 20190816]
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Photocatalytic reduction of CO2 with H2O to syngas is an effective way for producing high value-added chemical feedstocks such as methanol and light olefins in industry. Nevertheless, the precise control of CO/H-2 ratio from photocatalytic CO2 reduction reaction still poses a great challenge for the further application. Herein, we prepared a series of highly efficient heterostructure based on highly dispersed palladium supported on ultrathin CoAl-layered double hydroxide (LDH). In conjunction with a Ru-complex sensitizer, the molar ratios of CO/H-2 can be tuned from 1:0.74 to 1:3 under visible-light irradiation (lambda > 400 nm). More interestingly, the syngas can be obtained under light irradiation at lambda > 600 nm. Structure characterization and density functional theory calculations revealed that the remarkable catalytic activity can be due to the supported palladium, which improved the charge transfer efficiency. Meanwhile, more H atoms were used to generate H-2 on the supported palladium for further tunable CO/H-2 ratio. This work demonstrates a new strategy for harnessing abundant solar-energy to produce syngas from a CO2 feedstock. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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