A coordination polymer based on dinuclear (pyrazinyl tetrazolate) copper() cations and Wells-Dawson anions for high-performance supercapacitor electrodes

• Published in: Dalton transactions : an international journal of inorganic chemistry 2017-10, Vol.46 (4), p.13897-1392
• Main Authors: Wang, Guangning, Chen, Tingting, Li, Shaobin, Pang, Haijun, Ma, Huiyuan
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c7dt02230a

A new coordination polymer, (H 2 bpe)(Hbpe) 2 {[Cu(pzta)(H 2 O)][P 2 W 18 O 62 ]}·5H 2 O ( 1 ) (pztaH = 5-(2-pyrazinyl) tetrazolate, bpe = bis(4-pyridyl)ethylene), was synthesized by the hydrothermal method. The structure was determined by single crystal X-ray diffraction analyses and further characterized by the SEM, EDS, BVS, FTIR, and PXRD techniques. In 1 , the [P 2 W 18 O 62 ] 6− (P 2 W 18 ) clusters as bidentate connectors link [Cu(pzta)(H 2 O)] 2 4+ dinuclear copper( ii ) complexes to form inorganic-organic chains. These chains and the [H 2 bpe] 2+ counter-cations are fused together via hydrogen bonding to form a 3D supramolecular architecture. While 1 was employed as the electrode in a supercapacitor, the cycling stability (90.7% capacitance retention after 1000 circles) and specific capacitance (168 F g −1 at a current density of 5 A g −1 ) of the 1 -based electrode are better than those of the parent α-K 6 P 2 W 18 O 62 -based electrode, demonstrating more outstanding electrochemical performances of 1 . Besides, the 1 -based electrode showed excellent electrocatalytic activities towards the reduction of H 2 O 2 and KIO 3 . A new POM-based coordination polymer was used as supercapacitor electrode showing excellent performance, which can effectively solve the water solubility and low conductivity of traditional POM electrodes.