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Pt nanoparticles embedded in flowerlike NH2-UiO-68 for enhanced photocatalytic carbon dioxide reduction

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Abstract

Stabilizing metal nanoparticles (MNPs) with metal–organic frameworks (MOFs) has become a favorable pathway for developing efficient hybrid photocatalysts, while effective charge transfer within hybrid catalysts is largely elusive. In this work, we employed a semiconductor-like Zr-MOF, NH2-UiO-68, with an amino-functionalized linker and permanent porosity enabling the confinement of guest species for the first time. Pt NPs have been embedded inside (referred to as Pt@MOF), outside (referred to as Pt/MOF) or both inside and outside (referred to as Pt-MOF) of the flowerlike NH2-UiO-68 by varying synthetic methods and Pt NP amounts. Among these different hybrids, the 2 wt% Pt@NH2-UiO-68 sample presents the highest photocatalytic CO2 reduction activity under visible light irradiation, and is far superior to the 2 wt% Pt/NH2-UiO-68, 1 wt% Pt@NH2-UiO-68, and 4 wt% Pt-NH2-UiO-68 samples. The appropriate location and content of Pt NPs in the catalysts would facilitate the contact between Pt NPs and NH2-UiO-68, which is beneficial to form Pt-MOF heterojunctions, thereby achieving efficient charge transfer in the photocatalytic process. More importantly, effective charge transfer from NH2-UiO-68 to the excited Pt NPs via Pt-MOF Schottky junctions can accordingly inhibit the recombination of photogenerated charge carriers, ultimately leading to the enhancement of photocatalytic activity.

Graphical abstract: Pt nanoparticles embedded in flowerlike NH2-UiO-68 for enhanced photocatalytic carbon dioxide reduction

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Publication details

The article was received on 25 Sep 2019, accepted on 02 Nov 2019 and first published on 04 Nov 2019


Article type: Paper
DOI: 10.1039/C9TA10575A
J. Mater. Chem. A, 2019, Advance Article

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    Pt nanoparticles embedded in flowerlike NH2-UiO-68 for enhanced photocatalytic carbon dioxide reduction

    F. Guo, Y. Wei, S. Wang, X. Zhang, F. Wang and W. Sun, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA10575A

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