Ti(IV)-MOF with Specific Facet-Ag Nanoparticle Composites for Enhancing the Photocatalytic Activity and Selectivity of CO2 Reduction

Xiao-Mei Cheng; Peng Wang; Shi-Qing Wang; Jing Zhao; Wei-Yin Sun

doi:10.1021/acsami.2c05037

Ti(IV)-MOF with Specific Facet-Ag Nanoparticle Composites for Enhancing the Photocatalytic Activity and Selectivity of CO₂ Reduction

ACS Appl Mater Interfaces. 2022 Jul 20;14(28):32350-32359. doi: 10.1021/acsami.2c05037. Epub 2022 Jul 8.

Authors

Xiao-Mei Cheng^{1

2}, Peng Wang¹, Shi-Qing Wang¹, Jing Zhao², Wei-Yin Sun¹

Affiliations

¹ Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
² State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

PMID: 35801822
DOI: 10.1021/acsami.2c05037

Abstract

Metal nanoparticles deposited in the photocatalyst not only can serve as a cocatalyst but also can act as a light harvester to extend the light absorption, resulting from the surface plasmon resonance (SPR). In this study, we deposited silver nanoparticles (Ag NPs) onto NH₂-MIL-125(Ti) with exposed specific facets and achieved effectively improved activity and selectivity for photocatalytic CO₂ reduction. Loading Ag NPs on the exposed {111} facets of NH₂-MIL-125(Ti) generates a highly effective composite catalyst for the photoreduction of CO₂, resulting in the maximal CO and CH₄ yields of 26.7 and 63.3 μmol g^-1 h^-1, respectively, which are 2.2- and 16.2-fold those of the NH₂-MIL-125(Ti) exposing {111} facets, and a CH₄ selectivity of 90.5%. Incorporation of Ag NPs not only optimizes the electronic structure of the photocatalyst but also suppresses the recombination of photogenerated electron-hole pairs. This study provides an exciting example for creating and understanding metal-decorated facet-dependent effects on metal-organic frameworks (MOFs) for photocatalytic reactions.

Keywords: Ag nanoparticles; MOF−Ag composite; facet-dependent effect; photocatalytic CO2 reduction; surface plasmon resonance; synergistic effect.