3 years ago

A High-Performance Supercapacitor Afforded by a High-Connected Keggin based 3D Coordination Polymer

Haijun Pang, Xinming Wang, Huiyuan Ma, Guangning Wang, Tingting Chen
A new coordination polymer Ag5(brtmb)4[VW10V2O40] (1) (brtmb = 1-bromo-4-(1,2,4-triazol-1-ylmethyl)benzene) was synthesized by hydrothermal method. The structure was determined by single crystal X-ray diffraction analyses and further characterized by SEM, EDS, BVS, FTIR, and PXRD techniques. A structural feature in 1 is that each of the [VW10V2O40]5- clusters as an octa-dentate connector links eight silver-brtmb subunits to generate a three-dimensional (3D) structure. While employed as electrodes in supercapacitors, compound 1 showed remarkable electrochemical performances with a high capacitance 132.7 mF cm-2 at 0.5 mA cm-2 (206 F g-1 at 110 A g-1), and a good cycling ability at various current densities up to 2.0 mA cm-2 (440 A g-1), 81.7% of the initial capacitance remained after 1000 cycles. The above results reveal that the POM-based hybrid coordination polymers may be a new generation alternative electrode material for high-performance electrochemical capacitors.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701031

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