A monolithic gold nanoparticle@metal-organic framework composite as CO2 photoreduction catalyst. (March 2023)

• Record Type: Journal Article
• Authors: Tian, T.; Xu, J.; Abdolazizi, A.; Ji, C.; Hou, J.; Riley, D.J.; Yan, C.; Ryan, M.P.; Xie, F.; Petit, C.
• Is Part Of: Materials today nano. Volume 21(2023)
• Publication Date: 2023-03
• Subjects: Metal-organic frameworks -- Monolith -- Gold nanoparticles -- Plasmonic effects -- CO2 photoreduction; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Nanoscience; Nanotechnology -- Periodicals; Periodicals; Periodical; Electronic journals; Electronic journals; 620.5
• DOI: 10.1016/j.mtnano.2022.100293
• Languages: English
• ISSNs: 2588-8420

Abstract

Abstract: The application of metal-organic frameworks (MOFs), especially MOF composites, has been hindered by a lack of method to process powders into useable forms. To address this challenge, we report here a low temperature synthesis method that enables direct formation of a densified monolithic MOF composite, i.e. Au@ZIF-67. The monolithic composite contains Au nanoparticles (Au NPs) that are well-dispersed and encapsulated within ZIF-67 particles. It exhibits high surface area, bulk density, and mechanical robustness as observed in monolithic ZIF-67, while retaining the localized surface plasmonic resonance (LSPR) characteristic of Au NPs. Benefiting from this unique combination, the monolithic Au@ZIF-67 samples display an enhanced CO2 photoreduction performance under visible light—with the best-performing Au@ZIF-67 sample showing a volumetric CO production rate 1.5 and 3 times higher compared to the pristine monolithic ZIF-67 and ZIF-67 powder, respectively. Graphical abstract: Image 1 Highlights: We have synthesized the first core-shell monolithic MOF composite, Au@ZIF-67, by a sol-gel method. The composite presented an improved volumetric CO2 photoreduction efficiency compared to the pristine monolithic ZIF-67 and ZIF-67 powder. The improved performance is attributed to the high bulk density (monolith), the plasmonic effect (Au), and the heterojunction formed between Au and ZIF-67.