Premium
A Dendritic Nickel Cobalt Sulfide Nanostructure for Alkaline Battery Electrodes
Author(s) -
Li Wenyao,
Zhang Bingjie,
Lin Runjia,
HoKimura SocMan,
He Guanjie,
Zhou Xiying,
Hu Junqing,
Parkin Ivan P.
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201705937
Subject(s) - materials science , horizontal scan rate , electrochemistry , cyclic voltammetry , electrode , nanostructure , cobalt sulfide , battery (electricity) , nickel sulfide , nickel , current density , chemical engineering , alkaline battery , nanotechnology , metallurgy , chemistry , power (physics) , physics , quantum mechanics , electrolyte , engineering
A uniform dendritic NiCo 2 S 4 @NiCo 2 S 4 hierarchical nanostructure of width ≈100 nm is successfully designed and synthesized. From kinetic analysis of the electrochemical reactions, those electrodes function in rechargeable alkaline batteries (RABs). The dendritic structure exhibited by the electrodes has a high discharge‐specific capacity of 4.43 mAh cm −2 at a high current density of 240 mA cm −2 with a good rate capability of 70.1% after increasing the current densities from 40 to 240 mA cm −2 . At low scan rate of 0.5 mV s −1 in cyclic voltammetry test, the semidiffusion controlled electrochemical reaction contributes ≈92% of the total capacity, this value decreases to ≈43% at a high scan rate of 20 mV s −1 . These results enable a detailed analysis of the reaction mechanism for RABs and suggest design concepts for new electrode materials.