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The next big thing for silicon nanostructures – CO₂ photocatalysis

Sun, Wei and Yan, Xiaoliang and Qian, Chenxi and Duchesne, Paul N. and Kumar, Sai Govind Hari and Ozin, Geoffrey A. (2020) The next big thing for silicon nanostructures – CO₂ photocatalysis. Faraday Discussions, 222 . pp. 424-432. ISSN 1359-6640. https://resolver.caltech.edu/CaltechAUTHORS:20200302-154755645

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Abstract

Silicene is a relatively new member of the growing family of two-dimensional single-element materials. Both top-down and bottom-up approaches provide access to silicene, the former via vapor deposition on a substrate and the latter via exfoliation of the layered CaSi₂ precursor. Most top-down research has been concerned with understanding the various electronic, optical, magnetic, mechanical, electrical, thermal transport and gas-adsorption properties of silicene. By contrast, the focus on bottom-up silicene has primarily been on its synthesis, structure and chemical properties as they relate to its function and utility. Herein, emphasis is placed on the bottom-up strategy because of its scalability and the ease of subsequent silicene modification, with both qualities being important prerequisites for heterogeneous catalysis applications. In this context, synthetic freestanding silicene exists as single sheets or multilayer assemblies, depending on the CaSi₂ exfoliation synthesis conditions. The structure of a sheet comprises three connected chair-configuration silicon 6-rings. This connectivity creates buckled sheets in which the hybridization around the unsaturated silicon atoms is sp²–sp³. By adjusting the CaSi₂ exfoliation synthesis conditions, either layered silane (Si₆H₆) or siloxene (Si₆H₃(OH)₃) nanosheets can be obtained. In our studies, we have explored the nucleation and growth of different transition metal nanoparticles on and within the layer spaces of these nanosheets, and explored their thermochemical and photochemical reactivity in CO₂ hydrogenation reactions. An overview of these findings, related works and a new-and-optimized catalyst are provided in this article.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1039/c9fd00104bDOIArticle
ORCID:
AuthorORCID
Yan, Xiaoliang0000-0002-6860-4770
Qian, Chenxi0000-0003-4815-5565
Duchesne, Paul N.0000-0002-9046-1198
Ozin, Geoffrey A.0000-0002-6315-0925
Additional Information:© 2020 The Royal Society of Chemistry. Submitted 07 Oct 2019; Accepted 26 Nov 2019; First published 26 Nov 2019. G. A. O. acknowledges the financial support of the Ontario Ministry of Research and Innovation (MRI), the Ministry of Economic Development, Employment and Infrastructure (MEDI), the Ministry of the Environment and Climate Change’s (MOECC) Best in Science (BIS) Award, the Ontario Center of Excellence Solutions 2030 Challenge Fund, the Ministry of Research Innovation and Science (MRIS) Low Carbon Innovation Fund (LCIF), Imperial Oil, the University of Toronto’s Connaught Innovation Fund (CIF), the Connaught Global Challenge (CGC) Fund, and the Natural Sciences and Engineering Research Council of Canada (NSERC). W. S. acknowledges the financial support of the ZJU100 Young Professor Program from Zhejiang University and the National Natural Science Foundation of China (Grant No. 51902287). X. L. Y. acknowledges the National Natural Science Foundation of China (Grant No. 21878203), Shanxi International Cooperation Project (Grant No. 201703D421037), and Natural Science Foundation of Shanxi Province (Grant No. 201801D121061). C. Q. and P. N. D. acknowledge the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) for postdoctoral scholarships. The authors wish to thank Dr Abdinoor A. Jelle for his help in performing TEM characterization. There are no conflicts to declare.
Funders:
Funding AgencyGrant Number
Ontario Ministry of Economic Development, Employment and InfrastructureUNSPECIFIED
Ministry of the Environment and Climate Change (Canada)UNSPECIFIED
Ontario Ministry of Research Innovation and ScienceUNSPECIFIED
Imperial OilUNSPECIFIED
University of TorontoUNSPECIFIED
Connaught Global Challenge (CGC) FundUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Zhejiang UniversityUNSPECIFIED
National Natural Science Foundation of China51902287
National Natural Science Foundation of China21878203
Shanxi International Cooperation201703D421037
Natural Science Foundation of Shanxi Province201801D121061
Record Number:CaltechAUTHORS:20200302-154755645
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200302-154755645
Official Citation:The next big thing for silicon nanostructures – CO₂ photocatalysis. Faraday Discuss., 2020, 222, 424-432; doi:10.1039/c9fd00104b
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101667
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Mar 2020 20:31
Last Modified:01 Jul 2020 22:14

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