Porous Hybrid Network of Graphene and Metal Oxide Nanosheets as Useful Matrix for Improving the Electrode Performance of Layered Double Hydroxides

Tae Ha Gu; Jayavant L. Gunjakar; In Young Kim; Sharad B. Patil; Jang Mee Lee; Xiaoyan Jin; Nam Suk Lee; Seong Ju Hwang

doi:10.1002/smll.201500286

Porous Hybrid Network of Graphene and Metal Oxide Nanosheets as Useful Matrix for Improving the Electrode Performance of Layered Double Hydroxides

Tae Ha Gu, Jayavant L. Gunjakar, In Young Kim, Sharad B. Patil, Jang Mee Lee, Xiaoyan Jin, Nam Suk Lee, Seong Ju Hwang

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Mesoporous hybrid network of reduced graphene oxide (rG-O) and layered MnO₂ nanosheets could act as an efficient immobilization matrix for improving the electrochemical activity of layered double hydroxide (LDH). The control of MnO₂/rG-O ratio is crucial in optimizing the porous structure and electrical conductivity of the resulting hybrid structure. The immobilization of Co-Al-LDH on hybrid MnO₂/rG-O network is more effective in enhancing its electrode activity compared with that of on pure rG-O network. The Co-Al-LDH-rG-O-MnO₂ nanohybrid deliveres a greater specific capacitance than does MnO₂-free Co-Al-LDH-rG-O nanohybrid. The beneficial effect of MnO₂ incorporation on the electrode performance of nanohybrid is more prominent for higher current density and faster scan rate, underscoring the significant enhancement of the electron transport of Co-Al-LDH-rG-O. This is supported by electrochemical impedance spectroscopy. The present study clearly demonstrates the usefulness of the porously assembled hybrid network of graphene and metal oxide nanosheets as an effective platform for exploring efficient LDH-based functional materials.

Original language	English
Pages (from-to)	3921-3931
Number of pages	11
Journal	Small
Volume	11
Issue number	32
DOIs	https://doi.org/10.1002/smll.201500286
State	Published - 1 Aug 2015

Bibliographical note

Funding Information:
This research was supported by the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (Grant No. 10041232), by the Korea Ministry of Environment as “Converging Technology Project” (191‐101‐001), by the National Research Foundation of Korea Grant funded by the Korean Government (2010‐0001485), and by the National Research Foundation (NRF) of Korea grant funded by the Korea government (MSIP) (No. NRF‐2014R1A2A1A10052809). The experiments at PLS were supported in part by MOST and POSTECH.

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

graphene
hybrid networks
layered double hydroxides
metal oxide nanosheets
supercapacitors

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10.1002/smll.201500286

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title = "Porous Hybrid Network of Graphene and Metal Oxide Nanosheets as Useful Matrix for Improving the Electrode Performance of Layered Double Hydroxides",

abstract = "Mesoporous hybrid network of reduced graphene oxide (rG-O) and layered MnO2 nanosheets could act as an efficient immobilization matrix for improving the electrochemical activity of layered double hydroxide (LDH). The control of MnO2/rG-O ratio is crucial in optimizing the porous structure and electrical conductivity of the resulting hybrid structure. The immobilization of Co-Al-LDH on hybrid MnO2/rG-O network is more effective in enhancing its electrode activity compared with that of on pure rG-O network. The Co-Al-LDH-rG-O-MnO2 nanohybrid deliveres a greater specific capacitance than does MnO2-free Co-Al-LDH-rG-O nanohybrid. The beneficial effect of MnO2 incorporation on the electrode performance of nanohybrid is more prominent for higher current density and faster scan rate, underscoring the significant enhancement of the electron transport of Co-Al-LDH-rG-O. This is supported by electrochemical impedance spectroscopy. The present study clearly demonstrates the usefulness of the porously assembled hybrid network of graphene and metal oxide nanosheets as an effective platform for exploring efficient LDH-based functional materials.",

keywords = "graphene, hybrid networks, layered double hydroxides, metal oxide nanosheets, supercapacitors",

author = "Gu, {Tae Ha} and Gunjakar, {Jayavant L.} and Kim, {In Young} and Patil, {Sharad B.} and Lee, {Jang Mee} and Xiaoyan Jin and Lee, {Nam Suk} and Hwang, {Seong Ju}",

note = "Funding Information: This research was supported by the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (Grant No. 10041232), by the Korea Ministry of Environment as “Converging Technology Project” (191‐101‐001), by the National Research Foundation of Korea Grant funded by the Korean Government (2010‐0001485), and by the National Research Foundation (NRF) of Korea grant funded by the Korea government (MSIP) (No. NRF‐2014R1A2A1A10052809). The experiments at PLS were supported in part by MOST and POSTECH. Publisher Copyright: {\textcopyright} 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.",

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doi = "10.1002/smll.201500286",

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AU - Gu, Tae Ha

AU - Gunjakar, Jayavant L.

AU - Kim, In Young

AU - Patil, Sharad B.

AU - Lee, Jang Mee

AU - Jin, Xiaoyan

AU - Lee, Nam Suk

AU - Hwang, Seong Ju

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PY - 2015/8/1

Y1 - 2015/8/1

N2 - Mesoporous hybrid network of reduced graphene oxide (rG-O) and layered MnO2 nanosheets could act as an efficient immobilization matrix for improving the electrochemical activity of layered double hydroxide (LDH). The control of MnO2/rG-O ratio is crucial in optimizing the porous structure and electrical conductivity of the resulting hybrid structure. The immobilization of Co-Al-LDH on hybrid MnO2/rG-O network is more effective in enhancing its electrode activity compared with that of on pure rG-O network. The Co-Al-LDH-rG-O-MnO2 nanohybrid deliveres a greater specific capacitance than does MnO2-free Co-Al-LDH-rG-O nanohybrid. The beneficial effect of MnO2 incorporation on the electrode performance of nanohybrid is more prominent for higher current density and faster scan rate, underscoring the significant enhancement of the electron transport of Co-Al-LDH-rG-O. This is supported by electrochemical impedance spectroscopy. The present study clearly demonstrates the usefulness of the porously assembled hybrid network of graphene and metal oxide nanosheets as an effective platform for exploring efficient LDH-based functional materials.

AB - Mesoporous hybrid network of reduced graphene oxide (rG-O) and layered MnO2 nanosheets could act as an efficient immobilization matrix for improving the electrochemical activity of layered double hydroxide (LDH). The control of MnO2/rG-O ratio is crucial in optimizing the porous structure and electrical conductivity of the resulting hybrid structure. The immobilization of Co-Al-LDH on hybrid MnO2/rG-O network is more effective in enhancing its electrode activity compared with that of on pure rG-O network. The Co-Al-LDH-rG-O-MnO2 nanohybrid deliveres a greater specific capacitance than does MnO2-free Co-Al-LDH-rG-O nanohybrid. The beneficial effect of MnO2 incorporation on the electrode performance of nanohybrid is more prominent for higher current density and faster scan rate, underscoring the significant enhancement of the electron transport of Co-Al-LDH-rG-O. This is supported by electrochemical impedance spectroscopy. The present study clearly demonstrates the usefulness of the porously assembled hybrid network of graphene and metal oxide nanosheets as an effective platform for exploring efficient LDH-based functional materials.

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Porous Hybrid Network of Graphene and Metal Oxide Nanosheets as Useful Matrix for Improving the Electrode Performance of Layered Double Hydroxides

Abstract

Bibliographical note

Keywords

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