Open Access

Article

Article ID: 326

Thermochemistry of the dissolution of tetra-4-sulfophthalocyanine nickel in aqueous solutions KОН at 298.15 K

by Olga Krutova, Vladimir Maizlish, Michael Bazanov, Viktor Chernikov, Alexey Volkov, Pavel Krutov

Mechanical Engineering Advances, Vol.2, No.2, 2024; 30 Views, 17 PDF Downloads

We have obtained a nickel tetra-4-sulfophthalocyanine complex, soluble in water. The standard enthalpies of formation of a compound can be considered as the sum of the additive group contributions of fragments of these molecules. We assessed this value using a method based on group systematics with a Benson-type classification of fragments taking into account the influence of the primary environment of the atoms. In order to obtain the value of the contribution of Ecompl(N)4-Ni, we used the bomb calorimetry method. The enthalpy of combustion of tetrakis (4-methoxyphenyl) porphine and its complex with nickel tetrakis (4-methoxyphenyl) porphine nickel were experimentally determined. Thermal effects of dissolution of crystalline nickel tetra-4-sulfophthalocyanine in aqueous solutions of various KOH concentrations (from 0.002 to 0.02 mol∙L −1 ) at 298.15 K were determined by direct calorimetric method. The measurements were carried out in a calorimeter with an isothermal shell equipped with a reaction vessel with a volume of 60 cm 3 , electric calibration at T = (293.15–308.15) ± 0.01 K and P = 100.5 ± 0.7 kPa and automatic temperature registration. The standard enthalpy of formation of dissociation products of the tetra-4-sulfophthalocyanine complex with nickel in an aqueous solution has been calculated.

Open Access

Review

Article ID: 1223

Prelithiation of electrodes in lithium-ion capacitors: A review

by Aston Sam D’Silva, M. P. Eldho, K. Lekha, J. Anushree, Vinayambika S. Bhat, Raghavendra Sagar

Mechanical Engineering Advances, Vol.2, No.2, 2024; 44 Views, 20 PDF Downloads

Lithium-ion capacitors (LICs) are one among the modern state-of-the-art hybrid capacitors comprising of high potential window and impart higher energy density than supercapacitors (SCs). These LICs encompass elevated power density and longer life span than lithium-ion batteries (LIBs). Preparation of high-performance electrode materials with electrochemically active microstructure and prelithiation are two efficient approaches to fabricate highly efficient LICs. But it comes across as a real dilemma of low initial Columbic efficiency if only microstructure is considered as an efficient way to enhance the performance. Nevertheless, prelithiation plays a crucial role in the manufacturing of LICs, improving the initial Coulombic efficiency and enlarging the voltage window. This paper reviews the recent lithiation approaches for Lithium-ion capacitors by providing their methods and discussing their results concerning their energy and power density.