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Achieving High Rate Performance in Layered Hydroxide Supercapacitor Electrodes
Author(s) -
Wang Xu,
Yan Chaoyi,
Sumboja Afriyanti,
Yan Jian,
Lee Pooi See
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201301240
Subject(s) - supercapacitor , materials science , electrolyte , hydroxide , electrode , capacitance , conductivity , cobalt , chemical engineering , cobalt hydroxide , nickel , layered double hydroxides , electrical conductor , energy storage , nanotechnology , composite material , metallurgy , electrochemistry , chemistry , engineering , power (physics) , physics , quantum mechanics
Layered hydroxides (LHs) are promising supercapacitor electrode materials with high specific capacitances. However, they generally exhibit poor energy storage ability at high current densities due to their insulating nature. Nickel‐cobalt‐aluminum LHs are synthesized and chemically treated to form LHs with enhanced conductivity that results in greatly enhanced rate performances. The key role of chemical treatment is to enable the partial conversion of Co 2+ to a more conductive Co 3+ state that stimulates charge transfers. Simultaneously, the defects on the LHs caused by the selective etching of Al promoted the electrolyte diffusion within LHs. As a result, the LHs show a high specific capacitance of 738 F g −1 at 30 A g −1 , which is 57.2% of 1289 F g −1 at 1 A g −1 . The strategy provides a facile and effective method to achieve high performance LHs for supercapacitor electrode materials.