Issue 11, 2016

A dye-like ligand-based metal–organic framework for efficient photocatalytic hydrogen production from aqueous solution

Abstract

A dye-like azo-carboxylic acid was chosen as an organic linker to construct a Gd3+ based metal–organic framework: [Gd2(abtc)(H2O)2(OH)2]·2H2O (Gd-MOF) (H4abtc = 3,3′,5,5′-azobenzene tetracarboxylic acid). The ultra-stable Gd-MOF possesses a HOMO–LUMO gap of 2.35 eV determined by UV-vis spectroscopy with an absorption edge at 530 nm, which presents effective photocatalytic activity for hydrogen evolution under UV-vis light illumination due to the porous structure and excellent light absorption of the dye-like ligand. To further enhance the photocatalytic activity, different amounts of Ag (1.0–2.0%) were deposited on Gd-MOF as a co-catalyst. The results of electrochemical impedance spectroscopy (EIS) and photoluminescence spectroscopy (PL) clearly indicate that the reaction proceeds through the electron transfer from Gd-MOF to the deposited Ag. Especially, Ag(1.5)/Gd-MOF exhibits significant improvement in the hydrogen evolution rate, which is about 1.5 times greater compared to that of bare Gd-MOF.

Graphical abstract: A dye-like ligand-based metal–organic framework for efficient photocatalytic hydrogen production from aqueous solution

Supplementary files

Article information

Article type
Paper
Submitted
09 Oct 2015
Accepted
23 Dec 2015
First published
23 Dec 2015

Catal. Sci. Technol., 2016,6, 3840-3844

A dye-like ligand-based metal–organic framework for efficient photocatalytic hydrogen production from aqueous solution

X. Sun, Q. Yu, F. Zhang, J. Wei and P. Yang, Catal. Sci. Technol., 2016, 6, 3840 DOI: 10.1039/C5CY01716E

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