Effects of Potential Modes on Performances of Electrodeposited Poly[Ni(salen)]/MWCNTs Composite as Supercapacitor Electrode Material

Abstract

In this investigation, poly[Ni(salen)]/MWCNTs composites (PMCs) were synthesised by electrodeposition method via linear sweep potential (LSP), potentiostatic (PS) and one-step potential pulse (SPP) modes, respectively. It was found that different modes resulted in diverse poly[Ni(salen)] morphologies. With the equal deposition time, the PMCs prepared via PS mode exhibited better capacity performances as electrode materials of supercapacitors. The specific capacitances of products prepared by LSP, PS and SPP modes were 72.8 F g , which is due to the difference of thickness of poly[Ni(salen)] wrapped on MWCNTs and length of poly[Ni(salen)] nano-belt. In addition, all the samples exhibited good reversibility as electrode materials.

Nickel–Salen-Type Polymer as Conducting Agent and Binder for Carbon-Free Cathodes in Lithium-Ion Batteries

“…Figure compares various FT-IR spectra from Ni­(CH 3 -salen)–LFP and poly­[Ni­(CH 3 -salen)–LFP] cathodes, Ni­(CH 3 -salen) monomer, LiFePO 4 , and PVdF. The Ni­(CH 3 -salen) monomer demonstrated an absorption from CN imine stretching band at around 1614 cm –1 , which is split by the asymmetric stretching vibration of CN–C absorption. , For the monomer spectrum, absorption bands between 1300 and 1550 cm –1 are indicative of interaction between phenoxide and Ni, and split peak at 1095 cm –1 is from C–O stretch vibrations, which agrees very well with literature. , After the electrochemical polymerization at 4.3 V vs Li and continuous cycling in a range of 3.0–4.0 V vs Li , the poly­[Ni­(CH 3 -salen)] in the cathode maintained the major bands that are observed from the monomers, which is indicative of the stable polymerization process and its reversible redox capability during repeated cycling. As reported in earlier study, absorption peak at 737 cm –1 from monomer sample disappears after the polymerization process, of which characteristic is currently unknown and remains for future studies.…”

Atomic and Electronic Structure of Metal–Salen Complexes [M(Salen)], Their Polymers and Composites Based on Them with Carbon Nanostructures: Review of X-ray Spectroscopy Studies

“…The literature provides several key methods for forming composites of MWCNTs (SWCNTs), graphene, and electrically conductive polymers based on [Ni(Salen)] complexes by electrochemical deposition. One approach is to prepare a conductive electrode with a carbon layer that serves as a substrate for the formation of a polymer, such as poly-[Ni(Salen)] [5,7,42,113,114] [42], by using a solution consisting of an electrolyte and a monomer and applying potentiodynamic, conventional, or pulsed potentiostatic methods. In the studies referred to, it was mainly MWCNTs that were used as the carbon material, with the preparing composites serving as materials for energy storage.…”

“…An important advantage of these polymers is also their high thermal stability (up to 350 • C) compared with monomer complexes due to their conductive polymer matrix. It is also expected that the synthesis of nanocomposites based on poly-[M(Salen)] and various forms of carbon (mesoporous and activated carbon), including nanostructured ones (carbon nanotubes, graphene, and nanoglobular carbon), will lead to the development of materials with improved energetic, catalytic, and other characteristics [3][4][5][6][7][8][9][10]. This quality improvement is achieved due to the uniform distribution of the polymer on the surface of the carbon component of the composite material, which has a high specific surface area, electrical conductivity, and mechanical properties (strength, elasticity).…”

“…Until now, the most popular methods for experimentally characterizing the properties of these new materials remain scanning electron microscopy (SEM), in situ UV-visible and IR spectroscopy, in situ ellipsometry, and electrochemical methods (cyclic voltammetry, chronoamperometry, impedance spectroscopy, etc.) [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. However, the methods used provide far from a complete understanding and description of the formation processes of these systems.…”

Tuning the Charge Transport in Nickel Salicylaldimine Polymers by the Ligand Structure

“…Polymeric materials based on salen-type complexes with transition metals are widely used in energy storage devices [1][2][3][4][5][6][7][8][9][10], photoelectrochemical [11,12] and electrochromic systems [13,14], electrochemical sensors [15][16][17], and battery safety elements [18,19], due to their intrinsic conductivity [20] and redox properties [3,21]. Such materials could be easily deposited in a controllable manner directly on the electrode surface by electrochemical oxidative polymerization from the solution of a monomer [3].…”