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Nanostructured Ternary Electrodes for Energy‐Storage Applications
Author(s) -
Rakhi Raghavan Baby,
Chen Wei,
Cha Dongkyu,
Alshareef H. N.
Publication year - 2012
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.201100609
Subject(s) - supercapacitor , materials science , capacitance , electrode , ternary operation , carbon nanotube , nanocomposite , graphene , energy storage , composite number , horizontal scan rate , current density , nanotechnology , carbon fibers , chemical engineering , composite material , electrochemistry , cyclic voltammetry , power (physics) , chemistry , physics , quantum mechanics , computer science , engineering , programming language
A three‐component, flexible electrode is developed for supercapacitors over graphitized carbon fabric, utilizing γ‐MnO 2 nanoflowers anchored onto carbon nanotubes (γ‐MnO 2 /CNT) as spacers for graphene nanosheets (GNs). The three‐component, composite electrode doubles the specific capacitance with respect to GN‐only electrodes, giving the highest‐reported specific capacitance (308 F g −1 ) for symmetric supercapacitors containing MnO 2 and GNs using a two‐electrode configuration, at a scan rate of 20 mV s −1 . A maximum energy density of 43 W h kg −1 is obtained for our symmetric supercapacitors at a constant discharge‐current density of 2.5 A g −1 using GN–(γ‐MnO 2 /CNT)‐nanocomposite electrodes. The fabricated supercapacitor device exhibits an excellent cycle life by retaining ≈90% of the initial specific capacitance after 5000 cycles.