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Phase transformation of NiCo hydroxides derived from carbonate anion and its effect on electrochemical pseudocapacitor performance

Title
Phase transformation of NiCo hydroxides derived from carbonate anion and its effect on electrochemical pseudocapacitor performance
Authors
Baek, Seong-HoJeong, Young-MinKim, Dong YeonPark, Il-Kyu
DGIST Authors
Baek, Seong-Ho; Jeong, Young-Min
Issue Date
2020-08
Citation
Chemical Engineering Journal, 393, 124713
Type
Article
Article Type
Article
Author Keywords
Layered double hydroxideCarbonate hydroxidePseudocapacitorPhase transformationHierarchical structure
Keywords
LAYERED DOUBLE HYDROXIDESHYDROTALCITE-LIKE COMPOUNDSARRAYSELECTRODETEMPERATURECONVERSIONNANOSHEETSEFFICIENTFOAM
ISSN
1385-8947
Abstract
Pseudocapacitors can exhibit higher capacity compared to traditional electrostatic or electric double-layer capacitors while they can provide faster power delivery and longer cycling ability than lithium–ion batteries. In this study, we demonstrate the hierarchical structures of NiCo hydroxides, which are grown on Ni foam via facile hydrothermal method and show enhanced pseudocapacitor performance. Moreover, we suggest the intriguing phase transformation of NiCo-layered double hydroxide (LDH) to NiCo-carbonate hydroxide (CH) and elucidate the morphological evolution mechanism from nanosheet to nanowire structures by increasing the concentration of carbonate anions during the synthesis procedure. The experimental results confirm that an increase of carbonate anions causes the phase and morphology of NiCo–LDH to transform into NiCo–CH. Consequently, the asymmetric device using NCCH16 electrode achieves excellent electrochemical performance, with an energy density of 31.1 Wh·kg−1 at a power density of 424.3 W·kg−1 due to their structural benefits, which provide effective electrolyte transport, charge transfer, and active site accessibility. © 2020 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/11573
DOI
10.1016/j.cej.2020.124713
Publisher
Elsevier BV
Related Researcher
Files:
There are no files associated with this item.
Collection:
Division of Energy Technology1. Journal Articles


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