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2018-12-27 [Colloquium] Two-dimensional nanomaterials for artificial photosynthesis: Turning CO 2 into a valuable resource Prof. Li-Chyong Chen
Speaker:Dr. Li-Chyong Chen 
Distinguished Research Fellow,
Center for Condensed Matter Sciences (CCMS) &
Director,
Center of Atomic Initiative for New Materials (AI-Mat)
National Taiwan University
Taipei, Taiwan 106


Title:
Two-dimensional nanomaterials for artificial photosynthesis: Turning CO 2 into a valuable resource

 
Abstract
Photocatalytic CO 2 conversion to hydrocarbon fuels, the so-called artificial photosynthesis or solar fuels, making possible simultaneous solar energy harvesting and CO 2 reduction reaction (CO2RR), is considered a killing two birds with one stone approach to solving the energy and environmental
problems.  However, the development of solar fuels has been hampered by the low photon-to-fuel conversion efficiency of the photocatalysts and lack of the product selectivity.  Here, I would like to present recent progress in developing two-dimensional (2D) nanomaterials for CO2RR application.
 Criteria in the choice of materials and the scientific issues regarding the interface physics and chemistry (e.g., the interaction of light with semiconductor and gaseous species) involved in the process of CO2RR will be addressed.  Notably, defect engineering (interstitial, substitutional, and
vacancy) in 2D chalcogenides was found to be a viable method towards promising photocatalysts for CO2RR.  Two cases will be illustrated: the carbon-doped SnS 2 nanosheets and single/few-layer MoS 2 with vacancies controlled by plasma treatment.  The role and interplay of the defects and the
hosting 2D materials as well as their effects on CO2RR will be presented.