Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 5, Issue 9, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.180867
Keywords
cobalt - nickel layered double hydroxide; surfactant; supercapacitor
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Funding
- National Science Foundation of China [51472172]
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Tailoring the morphology of cobalt-nickel layered double hydroxide (LDH) electrode material was successfully achieved via the process of cathodic electrodeposition by adding different surfactants (hexamethylenetetramine, dodecyltrimethylammonium bromide (DTAB) or cetyltrimethylammonium bromide). The as-prepared Co0.75Ni0.25(OH)(2) samples with surfactants exhibited wrinkle-like, cauliflower-like or net-like structures that corresponded to better electrochemical performances than the untreated one. In particular, a specific capacitance of 1209.1 F g(-1) was found for the cauliflower-like Co0.75Ni0.25(OH)(2) electrode material using DTAB as the surfactant at a current density of 1 A g(-1), whose structure boosted ion diffusion to present a good rate ability of 64% with a 50-fold increase in current density from 1 A g(-1) to 50 A g(-1). Accordingly, the asymmetric supercapacitor assembled by current LDH electrode and activated carbon electrode showed an energy density as high as 21.3 Wh kg(-1) at a power density of 3625 W kg(-1). The relationship between surfactant and electrochemical performance of the LDH electrode materials has been discussed.
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