Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 33, Issue 34, Pages 25768-25786Publisher
SPRINGER
DOI: 10.1007/s10854-022-09269-4
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- 985 test platform of School of Chemical Engineering of East China University of Science and Technology
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This study investigates the optimization of cobalt-nickel hydroxides as electrode materials for hybrid supercapacitors and their electrochemical performances, indicating the favorable bimetallic synergistic effect and porous structure, as well as the important influence of KOH electrolyte concentration on performance.
Transition metal cobalt-nickel hydroxides have been widely studied as electrode materials for hybrid supercapacitors (HSCs) due to their unique active component properties. Nevertheless, the influencing factors and optimization of their electrochemical performances are still being studied and discussed. In this paper, Co-Ni layered double hydroxide (LDH) porous structure assembled from nanosheets was formed directly on stainless steel wire mesh (SS) by potentiostatic deposition. The bimetallic synergistic effect and porous structure of Co-Ni LDHs are favorable to their electrochemical performances. The Co0.5Ni0.5(OH)(2)-SS (nominal composition) electrode has the optimal Co:Ni molar ratio, and its specific capacity values are 474.2 - 320.1 C g(-1) at different current densities (1-10 A g(-1)) in 1 M KOH electrolyte. In addition, the concentration of KOH electrolyte also plays an important role on the electrochemical mechanism and performances. Compared with 6 M KOH electrolyte, lower concentration (1 and 3 M) is much more conductive to the microstructural stability and electrochemical behaviors of Co0.5Ni0.5(OH)(2)-SS electrode. Moreover, the fabricated Co0.5Ni0.5(OH)(2)-SS//AC-SS HSC device exhibits a good cycling stability, and the maximum energy density is about 10.9 Wh kg(-1) at 548.0 W kg(-1).
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