Abstract
A new polyoxometalate (POM)-based inorganic-organic compound [Cu2(bimb)2(ox)](W6O19)·4H2O [bimb = 1,3-bis(1-imidazoly)benzene, ox = oxalic acid] (1), has been synthesized by hydrothermal reaction, and characterized by IR spectroscopy, single crystal X-ray diffraction, and powder X-ray diffraction. It consists by porous metal-organic 2D positive layers [Cu2(bimb)2(ox)]n2n+ and the W6O192− clusters serving as anionic pillars that make [Cu2(bimb)2(ox)]n2n+ positive layers aggregating around W6O192− clusters to achieve a novel porous intercalation structure. The compound 1 show high electrocatalytic activity for hydrogen evolution reaction (HER) with low overpotential (η) of 146 mV at a current density of 10 mA·cm−2, which is superior than the most of reported POM-based electrocatalysts. This is probable due to its unique porous intercalation structure that H+ can diffuse easily through the pores. Also, the HER mechanism was discussed, and the electrocatalytic reduction of NO2− ions was studied.
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