Issue 39, 2023

Efficient photoelectrocatalytic CO2 reduction to CH3OH via porous g-C3N4 nanosheets modified with cobalt phthalocyanine in ionic liquids

Abstract

Photocatalytic CO2 reduction into fuels is desirable; however, realizing efficient CnH2n+1OH (n = 1, 2) synthesis that involves electron-coupled proton transfer alongside C–C bond formation remains a challenge. Here, we demonstrated a photoelectrocatalytic (PEC) CO2 reduction strategy to generate CH3OH and CH3CH2OH on cobalt phthalocyanine/g-C3N4 (CoPc/CN) in ionic liquids (ILs). In situ infrared spectroscopy indicated that *HCOO was a key intermediate for the evolution of CH3OH, and density functional theory (DFT) revealed that the Gibbs energy of C–C coupling dropped significantly from 4.94 to 2.21 eV in the ILs electrolyte. The carrier separation efficiency was enhanced in [BMMIm]Br electrolyte, in which photocurrent was 9-fold higher than that in KHCO3. This strategy achieved record-high CH3OH and CH3CH2OH generation abilities (6465.9 and 218.6 μM cm−2 h−1), which were 60.7- and 17.8-fold higher than those in KHCO3, respectively. Therefore, this work develops a PEC strategy to obtain excellent CH3OH yield, and provides new insight into the C–C coupling mechanism in IL-assisted CO2 reduction.

Graphical abstract: Efficient photoelectrocatalytic CO2 reduction to CH3OH via porous g-C3N4 nanosheets modified with cobalt phthalocyanine in ionic liquids

  • This article is part of the themed collection: #MyFirstJMCA

Supplementary files

Article information

Article type
Paper
Submitted
02 июн 2023
Accepted
22 авг 2023
First published
22 авг 2023

J. Mater. Chem. A, 2023,11, 21078-21088

Efficient photoelectrocatalytic CO2 reduction to CH3OH via porous g-C3N4 nanosheets modified with cobalt phthalocyanine in ionic liquids

P. Li, Y. Lin, Z. Qi and D. Yan, J. Mater. Chem. A, 2023, 11, 21078 DOI: 10.1039/D3TA03285J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements