Modification of Porous Carbon Material with Polymeric Cobalt Complex with a Schiff Base of Salen-Type for Electrodes of
- PDF / 430,999 Bytes
- 3 Pages / 612 x 792 pts (letter) Page_size
- 35 Downloads / 203 Views
cation of Porous Carbon Material with Polymeric Cobalt Complex with a Schiff Base of Salen-Type for Electrodes of Electrochemical Supercapacitors Yu. A. Polozhentsevaa, M. V. Novozhilovaa, V. A. Bykova, and M. P. Karusheva* a Ioffe
Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia *e-mail: [email protected] Received May 29, 2020; revised June 15, 2020; accepted June 15, 2020
Abstract—The effect of modification of a porous carbon material used to manufacture supercapacitors with a polymeric cobalt complex with a Salen-type Schiff base on the capacity of the material has been studied. Conjunction of multielectron redox processes in the polymer with the proposed effective modification technology makes it possible to increase the electrode capacity by 2.4 times in comparison with unmodified carbon electrodes. The specific capacity of the polymer poly-[Co(CH3OSaltmen)] at a polymer deposition density of 1.3 mg cm–2 was 170 mA h g–1. Keywords: conducting metallopolymer, Schiff base, supercapacitor. DOI: 10.1134/S1063785020090278
Electrochemical double-layer capacitors (EDLCs) constitute a practically important electrochemical energy system capable of providing a high specific power. The specific characteristics of EDLCs are mostly determined by the properties of the materials used. In the overwhelming majority of devices, the role of active materials for electrodes is played by carbon materials with a large specific surface area. The development of systems of this kind is restricted by the specific capacity of the materials used. It is apparent that the limit of raising the specific surface area and, consequently, the capacity of carbon materials have, in fact, been reached [1]. An effective way to raise the energy of EDLCs is to modify the surface of carbon materials with substances able to undergo a reversible electrochemical oxidation in the range of potentials at which electrodes in EDLCs operate. The conducting polymers examined as modifiers of this kind include polyaniline [2, 3], polypyrrole [4, 5], and polyethylene dioxythiophene [6], which have a fast charge–discharge kinetics and low cost [2, 4]. However, organic conductive polymers are characterized by an insufficiently high specific capacity and insufficient stability in multiple charge–discharge processes. Another type of polymers that can be used as a modifier is represented by polymeric complexes of transition metals with Schiff bases [7, 8]. These polymers possess a number of properties that enable application of electrodes modified with the polymeric complexes in energy-storage systems, specifically an ability for reversible electrochemical oxidation and reduction in a wide range of potentials [9], good specific capacity
and high charge-transport rate [10, 11], and unique thermal stability [12]. Polymeric complexes of nickel are successfully used to modify nanoporous carbon materials (they increase the capacity of the positive electrode without detioration capacity of the electric double layer of the carbon
Data Loading...
