Platinum single-atoms anchored covalent triazine framework for efficient photoreduction of CO2 to CH4.

[Display omitted] • Covalent triazine framework was used catalytic support to anchor single Pt atom. • Pt-SA/CTF-1 exhibited superior activity in photocatalytic conversion of CO 2 to CH 4. • The superiority was due to enhanced CO 2 adsorption and charge carriers separation. Achieving maximum atom-utilization efficiency is desirable to facilitate the charge separation and CO 2 activation for photocatalytic CO 2 reduction. Herein, we report a well-defined positioned synthesis of Pt single atoms in ethylene glycol (EG)-modified covalent triazine framework (Pt-SA/CTF-1) via a photo-deposition method for efficient photoreduction CO 2 to CH 4 under visible light irradiation. The well-defined coordination structure of Pt–N(C) sites in the Pt-SA/CTF-1 catalyst has been probed by HAADF-STEM and EXAFS. Results show that Pt single atoms confined into CTF-1 not only improved CO 2 adsorption and activation but also accelerated the separation and transfer of photogenerated carriers in CTF-1. Consequently, Pt-SA/CTF-1 exhibited superior photoactivity and stability, which significantly surpass the Pt nanoparticles-based CTF-1, affording CH 4 as the main reduction product. This work showcases an operable avenue to develop single-metal-atom photocatalysts and a mechanistic insight into photoreduction of CO 2 by CTF-based composite. [ABSTRACT FROM AUTHOR]