{P2W18O62}-Encapsulated Potassium Ion Nanotubes Intercalated in Copper-Biimidazole Frameworks for Supercapacitors and Hydrogen Peroxide Sensing

We synthesized a {P2W18O62}-encapsulated potassium ions nanotubes intercalated in copper-biimidazole frameworks [{K(H2O)}2{Cu2(bim)2}2(P2W18O62)](bim=biimidazole) (1) with {32.4.6.72}4{3}4 {43}2{46.68.83.1024.164} topology structure by hydrothermal method. K+ ion can encapsulate {P2W18O62} through strong covalent bond, which is beneficial to the uniform dispersion of {P2W18O62}, furthermore the insertion of copper-biimidazole frameworks can introduce N donors and apertures to reduce the resistance of the materials. Compound 1 as electrode material has high specific capacity (1070 F g-1 at 2 A g-1) in a wide potential range of -0.5-0.7V, which exhibits the excellent rate ability (81.8%) and a long cycling stability (89.8% retention after 5000 cycles). A fully symmetrical water system supercapacitor is prepared with the energy density of 0.71W h kg-1 at a power density of 116.17 W kg-1. Meanwhile, compound 1 is tested for a new sensitive current hydrogen peroxide sensor, displays that the linear range is 1....