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Engineering surface bromination in carbon nitride for efficient CO2 photoconversion to CH4 by Pengcheng Yan; Fawei Ji; Wei Zhang; Zhao Mo; Junchao Qian; Linhua Zhu; Li Xu is a Chemistry article available to read on EtoBox.

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The direct conversion of CO 2 into reusable CH 4 fuel by solar energy can effectively solve the problems of energy crisis and carbon emissions. However, the challenge of photocatalytic CO 2 reduction to produce CH 4 is still low conversion efficiency and poor selectivity. Here, surface brominated carbon nitride (named CNBr) is fabricated for stable and efficient photocatalytic CO 2 reduction to produce CH 4 with a rate of 16.68 lmol h À1 g À1 (70.27 % selectivity). Br atom in CNBr can substitute the N atom in the tris-triazine unites, which promotes local charge separation, narrows band gap and deepens the conduction band of CNBr. Benefiting from Br as active sites, CO 2 can be enriched on the catalyst surface, and localized photogenerated electrons can activate the adsorbed CO 2 to form CH 4 through subsequent hydrogenation. Density functional theory results suggest that Br doping can effectively reduce the energy barrier of the rate-limiting step, accelerate the reaction, and induce the formation of *CHO, thereby improving the selectivity of CH 4 . This work reveals that surface modification can simultaneously increase the activation site of CO 2 adsorption activation, enhance li

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Author

Pengcheng Yan; Fawei Ji; Wei Zhang; Zhao Mo; Junchao Qian; Linhua Zhu; Li Xu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)