Soft template-assisted copper-doped sodium dititanate nanosheet/graphene oxide heterostructure for photoreduction of carbon dioxide to liquid fuels

Napat Lertthanaphol; Natthanicha Prawiset; Pornpinun Soontornapaluk; Nutkamol Kitjanukit; Wannisa Neamsung; Natpichan Pienutsa; Kittapas Chusri; Thirawit Sornsuchat; Prowpatchara Chanthara; Poomiwat Phadungbut; Panpailin Seeharaj; Pattaraporn Kim-Lohsoontorn; Sira Srinives

doi:10.1039/D2RA04283E

Soft template-assisted copper-doped sodium dititanate nanosheet/graphene oxide heterostructure for photoreduction of carbon dioxide to liquid fuels†

Napat Lertthanaphol,

^a Natthanicha Prawiset,^a Pornpinun Soontornapaluk,^a Nutkamol Kitjanukit,^a Wannisa Neamsung,^a Natpichan Pienutsa,^a Kittapas Chusri,^a Thirawit Sornsuchat,^a Prowpatchara Chanthara,^a Poomiwat Phadungbut,^a Panpailin Seeharaj,^b Pattaraporn Kim-Lohsoontorn^c and Sira Srinives

*^a

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* Corresponding authors

^a Nanocomposite Engineering Laboratory (NanoCEN), Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakorn Pathom, Thailand
E-mail: Sira.sri@mahidol.edu

^b Advanced Materials Research Unit, Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand

^c Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand

Abstract

Photoreduction of CO₂ to a high-value product is an interesting approach that not only captures CO₂ but also converts it into other products that can be sold or used in industry. The mechanism for the CO₂ conversion relies strongly on photo-generated electrons that further couple with CO₂ and form active radicals for the reaction. In this research, we synthesized a heterostructure of copper-doped sodium dititanate nanosheets and graphene oxide (CTGN) following a one-step hydrothermal process with assistance from a sodium hydroxide soft template. The role of the template here is to facilitate the formation of the nanosheets, creating the nanosheet–graphene 2D–2D heterostructure. The heterostructure yields excellent charge mobility and a low charge recombination rate, while the nanosheet–graphene interfaces house active radicals and stabilize intermediates. The CTGN exhibits an outstanding photoactivity in the photoreduction of CO₂, producing liquid fuels, including acetone, methanol, ethanol and i-propanol.

RSC Advances

Soft template-assisted copper-doped sodium dititanate nanosheet/graphene oxide heterostructure for photoreduction of carbon dioxide to liquid fuels†

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