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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Atomic layer deposition encapsulated activated carbon electrodes for high voltage stable supercapacitors

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Title
Atomic layer deposition encapsulated activated carbon electrodes for high voltage stable supercapacitors
Author(s)
Kijoo Hong; Cho M.; Sang Ouk Kim
Publication Date
2015-01
Journal
ACS APPLIED MATERIALS & INTERFACES, v.7, no.3, pp.1899 - 1906
Publisher
AMER CHEMICAL SOC
Abstract
Operating voltage enhancement is an effective route for high energy density supercapacitors. Unfortunately, widely used activated carbon electrode generally suffers from poor electrochemical stability over 2.5 V. Here we present atomic layer deposition (ALD) encapsulation of activated carbons for high voltage stable supercapacitors. Two-nanometer- thick Al2O3 dielectric layers are conformally coated at activated carbon surface by ALD, well-maintaining microporous morphology. Resultant electrodes exhibit excellent stability at 3 V operation with 39% energy density enhancement from 2.5 V operation. Because of the protection of surface functional groups and reduction of electrolyte degradation, 74% of initial voltage was maintained 50 h after full charge, and 88% of capacitance was retained after 5000 cycles at 70 °C accelerated test, which correspond to 31 and 17% improvements from bare activated carbon, respectively. This ALD-based surface modification offers a general method to enhance electrochemical stability of carbon materials for diverse energy and environmental applications.
URI
https://pr.ibs.re.kr/handle/8788114/2139
ISSN
1944-8244
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
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