Enhanced pseudocapacitance of ionic liquid/cobalt hydroxide nanohybrids

Bong Gill Choi; Minho Yang; Sung Chul Jung; Kyoung G. Lee; Jin Gyu Kim; Hoseok Park; Tae Jung Park; Sang Bok Lee; Young Kyu Han; Yun Suk Huh

doi:10.1021/nn305750s

Enhanced pseudocapacitance of ionic liquid/cobalt hydroxide nanohybrids

Bong Gill Choi, Minho Yang, Sung Chul Jung, Kyoung G. Lee, Jin Gyu Kim, Hoseok Park, Tae Jung Park, Sang Bok Lee, Young Kyu Han, Yun Suk Huh

Department of Energy and Materials Engineering

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

101 Scopus citations

Abstract

Development of nanostructured materials with enhanced redox reaction capabilities is important for achieving high energy and power densities in energy storage systems. Here, we demonstrate that the nanohybridization of ionic liquids (ILs, 1-butyl-3-methylimidazolium tetrafluoroborate) and cobalt hydroxide (Co(OH)₂) through ionothermal synthesis leads to a rapid and reversible redox reaction. The as-synthesized IL-Co(OH)₂ has a favorable, tailored morphology with a large surface area of 400.4 m ²/g and a mesopore size of 4.8 nm. In particular, the IL-Co(OH) ₂-based electrode exhibits improvement in electrochemical characteristics compared with bare Co(OH)₂, showing a high specific capacitance of 859 F/g at 1 A/g, high-rate capability (∼95% retention at 30 A/g), and excellent cycling performance (∼96% retention over 1000 cycles). AC impedance analysis demonstrates that the introduction of ILs on Co(OH) ₂ facilitates ion transport and charge transfer: IL-Co(OH) ₂ shows a higher ion diffusion coefficient (1.06 × 10 ^-11 cm²/s) and lower charge transfer resistance (1.53 Ω) than those of bare Co(OH)₂ (2.55 × 10^-12 cm²/s and 2.59 Ω). Our density functional theory (DFT) calculations reveal that the IL molecules, consisting of anion and cation groups, enable easier hydrogen desorption/adsorption process, that is, a more favorable redox reaction on the Co(OH)₂ surface.

Original language	English
Pages (from-to)	2453-2460
Number of pages	8
Journal	ACS Nano
Volume	7
Issue number	3
DOIs	https://doi.org/10.1021/nn305750s
State	Published - 26 Mar 2013

Keywords

Co(OH)
ionic liquid
nanohybrid
redox reaction
supercapacitor

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10.1021/nn305750s

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@article{0209057a851a45669e607d6d0f80adb1,

title = "Enhanced pseudocapacitance of ionic liquid/cobalt hydroxide nanohybrids",

abstract = "Development of nanostructured materials with enhanced redox reaction capabilities is important for achieving high energy and power densities in energy storage systems. Here, we demonstrate that the nanohybridization of ionic liquids (ILs, 1-butyl-3-methylimidazolium tetrafluoroborate) and cobalt hydroxide (Co(OH)2) through ionothermal synthesis leads to a rapid and reversible redox reaction. The as-synthesized IL-Co(OH)2 has a favorable, tailored morphology with a large surface area of 400.4 m 2/g and a mesopore size of 4.8 nm. In particular, the IL-Co(OH) 2-based electrode exhibits improvement in electrochemical characteristics compared with bare Co(OH)2, showing a high specific capacitance of 859 F/g at 1 A/g, high-rate capability (∼95% retention at 30 A/g), and excellent cycling performance (∼96% retention over 1000 cycles). AC impedance analysis demonstrates that the introduction of ILs on Co(OH) 2 facilitates ion transport and charge transfer: IL-Co(OH) 2 shows a higher ion diffusion coefficient (1.06 × 10 -11 cm2/s) and lower charge transfer resistance (1.53 Ω) than those of bare Co(OH)2 (2.55 × 10-12 cm2/s and 2.59 Ω). Our density functional theory (DFT) calculations reveal that the IL molecules, consisting of anion and cation groups, enable easier hydrogen desorption/adsorption process, that is, a more favorable redox reaction on the Co(OH)2 surface.",

keywords = "Co(OH), ionic liquid, nanohybrid, redox reaction, supercapacitor",

author = "Choi, {Bong Gill} and Minho Yang and Jung, {Sung Chul} and Lee, {Kyoung G.} and Kim, {Jin Gyu} and Hoseok Park and Park, {Tae Jung} and Lee, {Sang Bok} and Han, {Young Kyu} and Huh, {Yun Suk}",

year = "2013",

month = mar,

day = "26",

doi = "10.1021/nn305750s",

language = "English",

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journal = "ACS Nano",

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publisher = "American Chemical Society",

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T1 - Enhanced pseudocapacitance of ionic liquid/cobalt hydroxide nanohybrids

AU - Choi, Bong Gill

AU - Yang, Minho

AU - Jung, Sung Chul

AU - Lee, Kyoung G.

AU - Kim, Jin Gyu

AU - Park, Hoseok

AU - Park, Tae Jung

AU - Lee, Sang Bok

AU - Han, Young Kyu

AU - Huh, Yun Suk

PY - 2013/3/26

Y1 - 2013/3/26

N2 - Development of nanostructured materials with enhanced redox reaction capabilities is important for achieving high energy and power densities in energy storage systems. Here, we demonstrate that the nanohybridization of ionic liquids (ILs, 1-butyl-3-methylimidazolium tetrafluoroborate) and cobalt hydroxide (Co(OH)2) through ionothermal synthesis leads to a rapid and reversible redox reaction. The as-synthesized IL-Co(OH)2 has a favorable, tailored morphology with a large surface area of 400.4 m 2/g and a mesopore size of 4.8 nm. In particular, the IL-Co(OH) 2-based electrode exhibits improvement in electrochemical characteristics compared with bare Co(OH)2, showing a high specific capacitance of 859 F/g at 1 A/g, high-rate capability (∼95% retention at 30 A/g), and excellent cycling performance (∼96% retention over 1000 cycles). AC impedance analysis demonstrates that the introduction of ILs on Co(OH) 2 facilitates ion transport and charge transfer: IL-Co(OH) 2 shows a higher ion diffusion coefficient (1.06 × 10 -11 cm2/s) and lower charge transfer resistance (1.53 Ω) than those of bare Co(OH)2 (2.55 × 10-12 cm2/s and 2.59 Ω). Our density functional theory (DFT) calculations reveal that the IL molecules, consisting of anion and cation groups, enable easier hydrogen desorption/adsorption process, that is, a more favorable redox reaction on the Co(OH)2 surface.

AB - Development of nanostructured materials with enhanced redox reaction capabilities is important for achieving high energy and power densities in energy storage systems. Here, we demonstrate that the nanohybridization of ionic liquids (ILs, 1-butyl-3-methylimidazolium tetrafluoroborate) and cobalt hydroxide (Co(OH)2) through ionothermal synthesis leads to a rapid and reversible redox reaction. The as-synthesized IL-Co(OH)2 has a favorable, tailored morphology with a large surface area of 400.4 m 2/g and a mesopore size of 4.8 nm. In particular, the IL-Co(OH) 2-based electrode exhibits improvement in electrochemical characteristics compared with bare Co(OH)2, showing a high specific capacitance of 859 F/g at 1 A/g, high-rate capability (∼95% retention at 30 A/g), and excellent cycling performance (∼96% retention over 1000 cycles). AC impedance analysis demonstrates that the introduction of ILs on Co(OH) 2 facilitates ion transport and charge transfer: IL-Co(OH) 2 shows a higher ion diffusion coefficient (1.06 × 10 -11 cm2/s) and lower charge transfer resistance (1.53 Ω) than those of bare Co(OH)2 (2.55 × 10-12 cm2/s and 2.59 Ω). Our density functional theory (DFT) calculations reveal that the IL molecules, consisting of anion and cation groups, enable easier hydrogen desorption/adsorption process, that is, a more favorable redox reaction on the Co(OH)2 surface.

KW - Co(OH)

KW - ionic liquid

KW - nanohybrid

KW - redox reaction

KW - supercapacitor

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DO - 10.1021/nn305750s

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EP - 2460

JO - ACS Nano

JF - ACS Nano

IS - 3

ER -

Enhanced pseudocapacitance of ionic liquid/cobalt hydroxide nanohybrids

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Keywords

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