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

Abstract

A new coordination polymer, (Hbpe)(Hbpe){[Cu(pzta)(HO)][PWO]}·5HO (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 [PWO] (PW) clusters as bidentate connectors link [Cu(pzta)(HO)] dinuclear copper(ii) complexes to form inorganic-organic chains. These chains and the [Hbpe] 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 at a current density of 5 A g) of the 1-based electrode are better than those of the parent α-KPWO-based electrode, demonstrating more outstanding electrochemical performances of 1. Besides, the 1-based electrode showed excellent electrocatalytic activities towards the reduction of HO and KIO.

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

“…(c) Relationship between crystal structure on the molecular level and their capacitance performance of the POM hybrids : POM is a class of nano‐scaled molecules with poor conductivity due to their isolated cluster structures. Herein, combining POM with metal cations or metal‐organic segments is an effective way to improve their capacitor performance,, yet the mechanism has been not clear. In order to initially explore that mechanism, two systems of POM hybrids have been prepared (Scheme ) and the capacitor performance have been compared.…”

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

“…In the following year, Zhang and coworkers designed a zinc‐porphyrin monomer and prepared the SC electrodes by the electropolymerization method to afford a conducting metal‐organic polymer ( IX ) 71 . The metal‐organic compounds exhibiting the SC properties were extended to those containing the Schiff‐base ligands ( XV ), 75 ferrocene‐based ligands ( XVI ) 76 and polyoxometalates (POMs, XVII ) 77 in 2017. From 2018 onwards, research interests of the metal‐organic compounds of the first transition metal series began to move to the two‐dimensional MOFs (eg, XVIII , XIX and XXI ) with planar polyamine and polyphenol ligands (Figure 9).…”

A Facile Grinding Method for the Synthesis of 3D Ag Metal–Organic Frameworks (MOFs) Containing Ag6Mo7O24 for High‐Performance Supercapacitors

“…reported that the phosphotungstic acid PTA/Al 2 (SO 4 ) 3 ⋅ 18 H 2 O can be used as a symmetric capacitor, and showed that the capacitance is 240 F g −1 at 6 mA. In 2017, Ma et al . reported the electrochemical performance of (H 2 bpe)(Hbpe) 2 {[Cu(pzta)(H 2 O)][P 2 W 18 O 62 ]} ⋅ 5 H 2 O with 168 F g −1 and a retention of 90.7 % after 1000 cycles.…”

“…In 2003, Wang et al [27] reported that the phosphotungstic acidP TA/Al 2 (SO 4 ) 3 ·18 H 2 Oc an be used as a symmetric capacitor,a nd showed that the capacitance is 240 Fg À1 at 6mA. In 2017, Ma et al [28] reported the electrochemicalp erformance of (H 2 bpe)(Hbpe) 2 {[Cu(pzta)(H 2 O)] [P 2 W 18 O 62 ]}·5H 2 Ow ith1 68 Fg À1 and ar etention of 90.7 %a fter 1000 cycles. However,P OMs also have the problems of easy agglomeration, small specific surfacea rea, and large self-resistance.…”