Issue 2, 2023

A novel S-scheme heterojunction constructed by Ti-based hydrotalcite decorating MOFs for boosting CO2-to-CO photoreduction and mechanism insights

Abstract

Herein, by decorating NH2-MIL-125 (NM) with NiTiLDH (NTL), NMxNTLy is designed for the CO2 photoreduction reaction in only water media. The optimal NM3NTL1 presents electronic yields of 65.74 μmol g−1 h−1 with a CO selectivity of 96.2%. Supported by in situ irradiated X-ray photoelectron spectroscopy (ISIXPS) and Kelvin probe force microscopy (KPFM), the designed NMxNTLy forms the S-scheme electron transfer mode with an interfacial electric field from NTL to NM, facilitating the migration of e/h+ pairs. NTL serves as an electron acceptor responsible for anchoring CO2, while NM is rich in holes for H2O oxidization, driven by coulombic forces under irradiation. Revealed by in situ DRIFTS, CO production follows the ˙CO2 and *COOH mechanisms. Significantly, we observed the reoxidation of CO from isotope labeling experiments, which could be inhibited on a S-scheme heterojunction with a spatially separated oxidation/reduction reaction. TPD coupled mass spectrometry (TPD-MS) suggests that the produced O2 might not completely desorb, which should explain for O2 readings below the theoretical values. This study provides new heterojunction photocatalyst designs and insights into the enhancement mechanism of the photocatalytic response.

Graphical abstract: A novel S-scheme heterojunction constructed by Ti-based hydrotalcite decorating MOFs for boosting CO2-to-CO photoreduction and mechanism insights

Supplementary files

Article information

Article type
Paper
Submitted
26 Oct 2022
Accepted
25 Nov 2022
First published
28 Nov 2022

J. Mater. Chem. A, 2023,11, 630-641

A novel S-scheme heterojunction constructed by Ti-based hydrotalcite decorating MOFs for boosting CO2-to-CO photoreduction and mechanism insights

R. Wang, Z. Wang, X. Shang, Y. Yang, J. Ding and Q. Zhong, J. Mater. Chem. A, 2023, 11, 630 DOI: 10.1039/D2TA08349C

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