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Design of Hierarchical NiCo@NiCo Layered Double Hydroxide Core–Shell Structured Nanotube Array for High‐Performance Flexible All‐Solid‐State Battery‐Type Supercapacitors
Author(s) -
Liu Yan,
Fu Nianqing,
Zhang Guoge,
Xu Ming,
Lu Wei,
Zhou Limin,
Huang Haitao
Publication year - 2017
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.201605307
Subject(s) - supercapacitor , materials science , capacitance , electrode , electrochemistry , carbon nanotube , current density , cobalt , nickel , battery (electricity) , hydroxide , chemical engineering , energy storage , nanotechnology , metallurgy , power (physics) , chemistry , physics , quantum mechanics , engineering
A novel hierarchical nanotube array (NTA) with a massive layered top and discretely separated nanotubes in a core–shell structure, that is, nickel–cobalt metallic core and nickel–cobalt layered double hydroxide shell (NiCo@NiCo LDH), is grown on carbon fiber cloth (CFC) by template‐assisted electrodeposition for high‐performance supercapacitor application. The synthesized NiCo@NiCo LDH NTAs/CFC shows high capacitance of 2200 F g −1 at a current density of 5 A g −1 , while 98.8% of its initial capacitance is retained after 5000 cycles. When the current density is increased from 1 to 20 A g −1 , the capacitance loss is less than 20%, demonstrating excellent rate capability. A highly flexible all‐solid‐state battery‐type supercapacitor is successfully fabricated with NiCo LDH NTAs/CFC as the positive electrode and electrospun carbon fibers/CFC as the negative electrode, showing a maximum specific capacitance of 319 F g −1 , a high energy density of 100 W h kg −1 at 1.5 kW kg −1 , and good cycling stability (98.6% after 3000 cycles). These fascinating electrochemical properties are resulted from the novel structure of electrode materials and synergistic contributions from the two electrodes, showing great potential for energy storage applications.