Impact of structure, doping and defect-engineering in 2D materials on CO capture and conversion

• Published in: Reaction chemistry & engineering 2021-09, Vol.6 (1), p.171-1738
• Main Authors: Jelmy, E. J, Thomas, Nishanth, Mathew, Dhanu Treasa, Louis, Jesna, Padmanabhan, Nisha T, Kumaravel, Vignesh, John, Honey, Pillai, Suresh C
• Format: Article
• ISSN: 2058-9883
• DOI: 10.1039/d1re00214g

The investigations on anthropogenic carbon dioxide (CO 2 ) capture and conversion play a vital role in eradicating global warming and the energy crisis. In this context, defect-engineered two-dimensional (2D) nanomaterials have received much attention in recent years. Herein, the significance of 2D nanomaterials such as graphene, transition metal dichalcogenides, hexagonal boron nitride, MXenes, graphitic carbon nitride, metal/covalent organic frameworks, nanoclays, borophenes, graphynes and green phosphorenes for CO 2 capture and conversion has been emphasized. Further, the intrinsic mechanism of CO 2 adsorption and conversion is discussed in detail. Theoretical and experimental studies among 2D materials highlight that N-doped porous adsorbents based on graphene and MXenes are more suitable for CO 2 adsorption applications. Also, more emphasis is given to outlining and discussing the role of various 2D nanomaterials and their hybrids as photocatalysts, electrocatalysts, photoelectrocatalysts, and thermocatalysts to transform CO 2 into valuable products. Although immense efforts are deployed in developing 2D catalysts for the conversion of CO 2 , challenges such as agglomeration, poor yield, difficulties in analysing the 2D structures for catalytic factors, poor knowledge and in-depth understanding of the reaction mechanisms, high cost, etc. limit their large scale production and commercialization. More detailed theoretical and experimental investigations are required to develop 2D nanostructures with optimum properties for large-scale capture and conversion of CO 2 . 2D material based strategies for adsorption and conversion of CO 2 to value-added products.