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Periodically ordered inverse opal TiO2/polyaniline core/shell design for electrochemical energy storage applications

Title
Periodically ordered inverse opal TiO2/polyaniline core/shell design for electrochemical energy storage applications
Authors
Patil B.H.Jang K.Lee S.Kim J.H.Yoon C.S.Kim J.Kim D.H.Ahn H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2017
Journal Title
Journal of Alloys and Compounds
ISSN
0925-8388JCR Link
Citation
vol. 694, pp. 111 - 118
Keywords
Core/shellInverse opalNanostructurePolyanilineSupercapacitorTiO2
Publisher
Elsevier Ltd
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In the present work, a unique core/shell structured TiO2/polyaniline (PANI) nanocomposite is successfully fabricated by chemically depositing PANI nanorods on a periodically arrayed TiO2 inverse opal (IO) structure for energy storage applications. The morphology, composition, and electrochemical behavior of the TiO2/PANI core/shell structure are studied and compared with those of the PANI nanorods on stainless steel substrate. Field emission scanning electron microscopy (FE-SEM) and transmission electron spectroscopy (TEM) studies confirm the formation of a PANI nanorod shell structure on the core of the TiO2 surface. A large specific capacity of 196.59 mA h g−1 at a scan rate of 5 mV s−1 is achieved for TiO2/PANI electrode which is comparable to that of TiO2 (2.83 mA h g−1) and PANI (95.86 mA h g−1) electrodes. Such improvement is ascribed to PANI with a high capacity and excellent conductivity, and the TiO2 IO structure with a large surface area and interconnected macropores, allowing efficient PANI nanorod loading, mass transport, and rapid charge transfer. A symmetric energy storage device is fabricated by assembling the two pieces of TiO2/PANI with a H2SO4 gel electrolyte. The device shows the high energy density of 20.36 Wh kg−1 at a power density of 500 W kg−1 with good cycling stability (78% for 1000 cycles). © 2016 Elsevier B.V.
DOI
10.1016/j.jallcom.2016.09.331
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자연과학대학 > 화학·나노과학전공 > Journal papers
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