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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
Author
안희준
Keywords
Core/shell; Nanostructure; Inverse opal; TiO2; Polyaniline; Supercapacitor
Issue Date
2017-02
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v. 694, page. 111-118
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). (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0925838816330948?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/112736
ISSN
0925-8388; 1873-4669
DOI
10.1016/j.jallcom.2016.09.331
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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