Research output: Contribution to journal › Article › peer-review
Kinetic analysis of redox processes in Salen-type polymers at sub-zero temperatures. / Novoselova, Julia; Ershov, Valentin; Levin, Oleg; Lukyanov, Daniil; Ovchinnikova, Lina; Li, Ruopeng; Yang, Peixia; Alekseeva, Elena.
In: Journal of Electroanalytical Chemistry, Vol. 923, 116823, 15.10.2022.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Kinetic analysis of redox processes in Salen-type polymers at sub-zero temperatures
AU - Novoselova, Julia
AU - Ershov, Valentin
AU - Levin, Oleg
AU - Lukyanov, Daniil
AU - Ovchinnikova, Lina
AU - Li, Ruopeng
AU - Yang, Peixia
AU - Alekseeva, Elena
N1 - Publisher Copyright: © 2022 Elsevier B.V.
PY - 2022/10/15
Y1 - 2022/10/15
N2 - Batteries and supercapacitors are widely used in various types of portable electronic devices and electric vehicles. Typically, they retain energy and power density at room temperature and at temperatures up to +60° C. However, at sub-zero temperatures, the energy as well as the power density of the power sources dramatically decline due to the sluggish kinetics, mostly connected with solvation/desolvation processes. One of the approaches to solving the problem is using organic electrode materials, among which NiSalen-type polymers may be considered as one of the prospective. Here, we investigate the kinetic restrictions of the redox processes in such polymers at sub-zero temperatures. Temperature-dependent relationships of the kinetic parameters of charge/discharge of poly[Ni(Salen)], poly[Ni(CH3Salen)] and poly [Ni(CH3Saltmen)] were determined in electrolyte solutions based on acetonitrile and ethyl acetate with Et4NBF4, LiClO4 and LiTFSI salts. It was shown that injection of counter ions into the polymer film limits the redox processes, and the activation energy of the process depends on the film structure as well as electrolyte composition. Proper combination of the electrolyte and polymer ensures low-activation process of counter ion injection, which corresponds to the absence of desolvation stage. As a result, fast charge and discharge of such materials is possible at the temperatures as low as –40 °C.
AB - Batteries and supercapacitors are widely used in various types of portable electronic devices and electric vehicles. Typically, they retain energy and power density at room temperature and at temperatures up to +60° C. However, at sub-zero temperatures, the energy as well as the power density of the power sources dramatically decline due to the sluggish kinetics, mostly connected with solvation/desolvation processes. One of the approaches to solving the problem is using organic electrode materials, among which NiSalen-type polymers may be considered as one of the prospective. Here, we investigate the kinetic restrictions of the redox processes in such polymers at sub-zero temperatures. Temperature-dependent relationships of the kinetic parameters of charge/discharge of poly[Ni(Salen)], poly[Ni(CH3Salen)] and poly [Ni(CH3Saltmen)] were determined in electrolyte solutions based on acetonitrile and ethyl acetate with Et4NBF4, LiClO4 and LiTFSI salts. It was shown that injection of counter ions into the polymer film limits the redox processes, and the activation energy of the process depends on the film structure as well as electrolyte composition. Proper combination of the electrolyte and polymer ensures low-activation process of counter ion injection, which corresponds to the absence of desolvation stage. As a result, fast charge and discharge of such materials is possible at the temperatures as low as –40 °C.
KW - Activation energy
KW - Cyclic Voltammetry
KW - Low temperature electrode material
KW - Metal-salen-type polymers
KW - Reaction rate constant
UR - http://www.scopus.com/inward/record.url?scp=85138436777&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2022.116823
DO - 10.1016/j.jelechem.2022.116823
M3 - Article
AN - SCOPUS:85138436777
VL - 923
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 1572-6657
M1 - 116823
ER -
ID: 99035434