Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications

Sang Bok Ma; Kyung Wan Nam; Won Sub Yoon; Xiao Qing Yang; Kyun Young Ahn; Ki Hwan Oh; Kwang Bum Kim

doi:10.1016/j.jpowsour.2007.12.027

Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications

Sang Bok Ma, Kyung Wan Nam, Won Sub Yoon, Xiao Qing Yang, Kyun Young Ahn, Ki Hwan Oh, Kwang Bum Kim

Department of Materials Science and Engineering

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

276 Citations (Scopus)

Abstract

Birnessite-type manganese dioxide (MnO₂) is coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the CNTs and permanganate ions (MnO₄^-). The initial specific capacitance of the MnO₂/CNT nanocomposite in an organic electrolyte at a large current density of 1 A g^-1 is 250 F g^-1. This is equivalent to 139 mAh g^-1 based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO₂ in the MnO₂/CNT nanocomposite is as high as 580 F g^-1 (320 mAh g^-1), indicating excellent electrochemical utilization of the MnO₂. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO₂/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO₂/CNT nanocomposite after heat-treatment.

Original language	English
Pages (from-to)	483-489
Number of pages	7
Journal	Journal of Power Sources
Volume	178
Issue number	1
DOIs	https://doi.org/10.1016/j.jpowsour.2007.12.027
Publication status	Published - 2008 Mar 15

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jpowsour.2007.12.027

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title = "Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications",

abstract = "Birnessite-type manganese dioxide (MnO2) is coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the CNTs and permanganate ions (MnO4-). The initial specific capacitance of the MnO2/CNT nanocomposite in an organic electrolyte at a large current density of 1 A g-1 is 250 F g-1. This is equivalent to 139 mAh g-1 based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO2 in the MnO2/CNT nanocomposite is as high as 580 F g-1 (320 mAh g-1), indicating excellent electrochemical utilization of the MnO2. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO2/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO2/CNT nanocomposite after heat-treatment.",

author = "Ma, {Sang Bok} and Nam, {Kyung Wan} and Yoon, {Won Sub} and Yang, {Xiao Qing} and Ahn, {Kyun Young} and Oh, {Ki Hwan} and Kim, {Kwang Bum}",

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T1 - Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications

AU - Ma, Sang Bok

AU - Nam, Kyung Wan

AU - Yoon, Won Sub

AU - Yang, Xiao Qing

AU - Ahn, Kyun Young

AU - Oh, Ki Hwan

AU - Kim, Kwang Bum

PY - 2008/3/15

Y1 - 2008/3/15

N2 - Birnessite-type manganese dioxide (MnO2) is coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the CNTs and permanganate ions (MnO4-). The initial specific capacitance of the MnO2/CNT nanocomposite in an organic electrolyte at a large current density of 1 A g-1 is 250 F g-1. This is equivalent to 139 mAh g-1 based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO2 in the MnO2/CNT nanocomposite is as high as 580 F g-1 (320 mAh g-1), indicating excellent electrochemical utilization of the MnO2. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO2/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO2/CNT nanocomposite after heat-treatment.

AB - Birnessite-type manganese dioxide (MnO2) is coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the CNTs and permanganate ions (MnO4-). The initial specific capacitance of the MnO2/CNT nanocomposite in an organic electrolyte at a large current density of 1 A g-1 is 250 F g-1. This is equivalent to 139 mAh g-1 based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO2 in the MnO2/CNT nanocomposite is as high as 580 F g-1 (320 mAh g-1), indicating excellent electrochemical utilization of the MnO2. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO2/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO2/CNT nanocomposite after heat-treatment.

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JO - Journal of Power Sources

JF - Journal of Power Sources

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Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications

Abstract

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UN SDGs

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