Hierarchical Porous Carbon Nitride-Crumpled Nanosheet-Embedded Copper Single Atoms: An Efficient Catalyst for Carbon Monoxide Oxidation
Author | Eid, Kamel |
Author | Sliem, Mostafa H. |
Author | Al-Ejji, Maryam |
Author | Abdullah, Aboubakr M. |
Author | Harfouche, Messaoud |
Author | Varma, Rajender S. |
Available date | 2023-01-08T08:27:18Z |
Publication Date | 2022 |
Publication Name | ACS Applied Materials and Interfaces |
Resource | Scopus |
Abstract | Rational design of metal single-site embedded porous graphitic carbon nitride (P-g-C3N4) nanostructures exploiting maximum atom utilization is warranted to enhance the thermal CO oxidation (COOx) reaction. Herein, a facile, green, one-pot, and template-free approach is developed to fabricate the hierarchical porous P-g-C3N4-crumpled ultrathin nanosheets atomically doped with copper single atoms (Cu–P-g-C3N4). Mechanistically, the quick protonation of melamine and pyridine under acidic conditions induces deamination to form melem, which is polycondensed under heating. The interconnected pores, high surface area (240 m2g–1), and maximized exposed isolated Cu atomic active sites (1.8 wt %) coordinated with nitrogen atom P-g-C3N4 are the salient features of Cu– P-g-C3N4 that endowed complete conversion to CO2 at 184 °C. In contrast, P-g-C3N4 only converted 3.8% of CO even at 350 °C, implying the electronic effect of Cu single atoms. The abundant Cu-nitrogen moieties can drastically weaken the binding affinity of the CO-oxidation (COOx) intermediates and products, thus accelerating the reaction kinetics at a low temperature. This study may promote the fabrication of P-g-C3N4 doped with various single atoms for the oxidation of CO. |
Sponsor | This work was supported by the Qatar National Research Fund (QNRF, a member of the Qatar Foundation) through a National Priority Research Program Grant (NPRP) NPRP13S-0117-200095 and the Qatar University through an International Research Collaboration Co-Fund grant, QUHI-22/23–550. The authors also gratefully thank the Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME), Allan 19252, Jordan for the XANES and EXAF measurements of Cu/P-g-C3N4 and its reference samples CuO, Cu2O, and Cu metal. Statements made herein are solely the responsibility of the authors. |
Language | en |
Publisher | American Chemical Society |
Subject | carbon nitride CO oxidation CO oxidation CO oxidation reaction mechanism Cu single site porous g-C3N4 |
Type | Article |
Pagination | 40749-40760 |
Issue Number | 36 |
Volume Number | 14 |
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