Nickel hydroxide obtained by high-temperature two-step synthesis as an effective material for supercapacitor applications
Autor: | B. A. Ananchenko, S. Deabate, I.A. Mudryi, Jean-Louis Bantignies, François Henn, Vadym Kovalenko, A. Mehdi, Andrey A. Burkov, V.A. Sololvov, Alexey Sykchin, Valerii Kotok |
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Přispěvatelé: | Joint Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus (NASB), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
Rok vydání: | 2016 |
Předmět: |
Supercapacitor
Materials science 020209 energy Inorganic chemistry chemistry.chemical_element [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 7. Clean energy Redox Nickel chemistry.chemical_compound Hydrolysis chemistry Electrode 0202 electrical engineering electronic engineering information engineering Hydroxide General Materials Science Thermal stability Electrical and Electronic Engineering 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
Zdroj: | Journal of Solid State Electrochemistry Journal of Solid State Electrochemistry, Springer Verlag, 2016, ⟨10.1007/s10008-016-3405-2⟩ |
ISSN: | 1433-0768 1432-8488 |
Popis: | Hybrid supercapacitors with nickel hydroxide electrode are widely used as modern power sources for electrovehicles, ignition of different electric engines, etc. Nickel hydroxide for supercapacitor use must satisfy special features which are quite different from those requested for battery application. The aim of this work is to improve the promising two-stage high-temperature method by altering hydrolysis condition (hot and cold) in order to obtain Ni(OH)2 with improved electrochemical activity. Ni(OH)2 samples have been investigated by PXRD, TG, DSC, SEM, TEM, cyclic voltammogramm, and galvanostatic charge-discharge cycling. It has been established from PXRD, TG, and DSC analyses that material obtained by hydrolysis at high temperature is a highly crystalline β-Ni(OH)2 characterized by high thermal stability. Materials prepared by cold hydrolysis are a highly defective βbc-Ni(OH)2, with 6.3 % water content and a lower thermal stability. It has been shown that samples prepared by hot hydrolysis have a high redox reversibility and electrochemical cycling stability, but a lower electrochemical capacity. This suggests that the electrochemical processes are localized in the thin layer at the particle surface. Cyclic voltammograms of samples prepared by cold hydrolysis exhibit gradual activation of the active material, anyhow resulting in higher capacity. By means of the galvanostatic charge-discharge curves at different current densities, the specific capacities of the samples have been calculated. The sample prepared by cold hydrolysis has higher specific capacities than the sample prepared by hot hydrolysis. |
Databáze: | OpenAIRE |
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