3D host-guest material of {Ag(pz)} modified {BW12O40} with supercapacitor, photocatalytic dye degradation and H2O2 sensing performances

The synthesis and properties of inorganic-organic hybrids based on {BW12O40} are still the focus of poly-oxometalates. Here, 3D host-guest material with the molecular formula [Ag5(pz)6(H2O)4][BW12O40] (pz = pyr-azine) (1) was synthesized by the hydrothermal method. The single crystal analysis showed that the compound was composed of a [Ag3(pz)4]3} fragment, a [Ag2(pz)2(H2O)4]2} fragment, and a [BW12O40]5-anion. In the structure, Ag ions are connected into 1D wavy linear bridge chains by pz ligands to form {Ag-pz}n. Twelve Ag ions form a large loop via pz, and each loop forms a supramolecular 2D structure with two {BW12O40} and forms a 3D structure through supramolecular interaction. In the three-electrode system with compound 1 as the active substance and nickel foam as the collector, the specific capacitance is 245.6 F g-1 when the current density is 1 A g-1. Higher than those reported in the literature. Constitute a symmetric two-electrode system, with an energy density of 6.9 Wh kg-1, with a power density of 498.7 W kg-1. And after 5000 cycles, the specific capacitance remains at 92.5%. Besides, the photocatalytic degradation rates of methylene blue (MB), methyl orange (MO), and rhodamine B (RhB) were 93.2% and 90.0%, and 93.7%, respectively. Good sensing performance for H2O2, with a wide linear range (5 mu M-0.27 mM) and low detection limit (2.2 mu M).

Automated summary

A 3D host-guest material was synthesized by the hydrothermal method, and its structure was determined by single crystal analysis. The material exhibited excellent electrochemical and photocatalytic degradation properties, as well as good sensing performance for hydrogen peroxide.