Copper-bipyridine grid frameworks incorporating redox-active tetrathiafulvalene: structures and supercapacitance

Abstract

Redox active tetrathiafulvalene (TTF) and its derivatives as electrode additives have exhibited improved energy efficiency and sustainability in batteries. However, the structure–property relationship has not been detailedly investigated until very...

Redox-Active Two-Dimensional Tetrathiafulvalene-Copper Metal–Organic Framework with Boosted Electrochemical Performances for Supercapatteries

“…Approximately 50% of the initial capacity was maintained when the specific current increased from 1.0 to 10.0 A g −1 . The C sp of 1 at 1 A g −1 is 98.7 C g −1 , much lower than that of 1-ox and 1-ox′, but twice as large as the reported maximum capacitance of TTFbased MOFs (Table S2), 28,29 which can be ascribed to the 2D layered structure of 1. The excellent behaviors of 1-ox′ and 1ox are ascribed to the high conductivity and densely aligned active sites resulted from oxidization, which is confirmed by electrochemical impedance spectroscopy measurement (Fig- ures 3d and S14).…”

“…TTF-based MOFs have been extensively studied in various fields such as conductivity, , magnetism, and optoelectronic , properties. The electrochemical performances of TTF-based MOFs were preliminarily explored by our group using a three-electrode configuration. , Because of the poor electrical conductivity, the electrochemical behaviors of these TTF-based MOFs are unsatisfactory. Considering that the electrical conductivity of TTF derivatives can be improved by oxidizing TTF to TTF ·+ radical cations, here, a TTF derivative, tetra­(4-pyridyl)-TTF (TTF-(py) 4 ), was selected to construct a new 2D TTF-based complex [(CuCN) 2 (TTF­(py) 4 )] ( 1 ).…”