Improving the low-temperature capacitance of CoNiAl three-component layered double hydroxide in a redox electrolyte
Graphical abstract: The specific capacitance of CoNiAl layered double hydroxide in 6 M KOH reduces sharply from room temperature to −20 °C, which is effectively enhanced by adding redox pair Fe(CN){sub 6}{sup 3−}/Fe(CN){sub 6}{sup 4−} in the electrolyte. - Highlights: • CoNiAl layered double hydroxide is synthesized by homogeneous precipitation. • The specific capacitance reduces sharply with the decrease of temperature. • At −20 °C the specific capacitance is increased by 178% in a redox electrolyte. - Abstract: CoNiAl three-component layered double hydroxide with a lamellar structure similar to hydrotalcite-like compounds is synthesized via homogeneous precipitation and the effect of temperature on its capacitive performances in 6 M KOH is investigated. Electrochemical tests show its specific capacitance reduces sharply with the decrease of temperature from 18 to −20 °C. At −20 °C an increase of specific capacitance by 178% is achieved by adding redox pair Fe(CN){sub 6}{sup 3−}/Fe(CN){sub 6}{sup 4−} as the electron shuttle in the electrolyte due to their cooperation with the electrode reaction during the charge/discharge processes.
- OSTI ID:
- 22341809
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 9; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fe(CN){sub 6}{sup 3-}/Fe(CN){sub 6}{sup 4-} redox in the interlayer determined by the charge density of Zn{sub n}Cr-layered double hydroxides
Effects of CO{sub 2} activation on electrochemical performance of microporous carbons derived from poly(vinylidene fluoride)