Block-copolymer-assisted one-pot synthesis of ordered mesoporous WO 3-x/carbon nanocomposites as high-rate-performance electrodes for pseudocapacitors

Changshin Jo, Jongkook Hwang, Hannah Song, Anh Ha Dao, Yong Tae Kim, Sang-Hyup Lee, Seok Won Hong, Songhun Yoon, Jinwoo Lee

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

An ordered mesoporous tungsten-oxide/carbon (denoted as m-WO 3-x-C-s) nanocomposite is synthesized using a simple one-pot method using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) as a structure-directing agent. The hydrophilic PEO block interacts with the carbon and tungsten precursors (resol polymer and WCl6), and the PS block is converted to pores after heating at 700 °C under a nitrogen flow. The m-WO 3-x-C-s nanocomposite has a high Brunauer-Emmett-Teller (BET) surface area and hexagonally ordered pores. Because of its mesoporous structure and high intrinsic density of tungsten oxide, this material exhibits a high average volumetric capacitance and gravimetric capacitance as a pseudocapacitor electrode. In comparison with reduced mesoporous tungsten oxide (denoted as m-WO3-x-h), which is synthesized by a tedious hard template approach and further reduction in a H2/N2 atmosphere, m-WO 3-x-C-s shows a high capacitance and enhanced rate performance, as confirmed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The good performance of m-WO 3-x-C-s is attributed to the high surface area arising from the mesoporous structure, the large interconnected mesopores, and the low internal resistance from the well-dispersed reduced tungsten oxide and amorphous carbon composite structure. Here, the amorphous carbon acts as an electrical pathway for effective pseudocapacitor behavior of WO3-x. An ordered mesoporous tungsten-oxide/carbon (m-WO3-x-C-s) nanocomposite is synthesized using a block-copolymer-assisted one-pot self-assembly method. As a pseudocapacitor electrode, m-WO3-x-C-s exhibits a high average volumetric capacitance of 340 F cm-3 and a gravimetric capacitance of 103 F g-1. The amorphous carbon in the m-WO3-x-C-s decreases the internal resistance of m-WO3-x-C-s electrode by facilitating electric conduction.

Original languageEnglish
Pages (from-to)3747-3754
Number of pages8
JournalAdvanced Functional Materials
Volume23
Issue number30
DOIs
Publication statusPublished - 2013 Aug 12

Fingerprint

block copolymers
tungsten oxides
Block copolymers
Tungsten
Nanocomposites
nanocomposites
Capacitance
Carbon
Amorphous carbon
capacitance
Electrodes
electrodes
carbon
synthesis
Oxides
Polyethylene oxides
Polystyrenes
porosity
Composite structures
Electrochemical impedance spectroscopy

Keywords

  • carbon
  • electrochemical capacitors
  • mesoporous materials
  • nanocomposites
  • tungsten oxide

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Block-copolymer-assisted one-pot synthesis of ordered mesoporous WO 3-x/carbon nanocomposites as high-rate-performance electrodes for pseudocapacitors. / Jo, Changshin; Hwang, Jongkook; Song, Hannah; Dao, Anh Ha; Kim, Yong Tae; Lee, Sang-Hyup; Hong, Seok Won; Yoon, Songhun; Lee, Jinwoo.

In: Advanced Functional Materials, Vol. 23, No. 30, 12.08.2013, p. 3747-3754.

Research output: Contribution to journalArticle

Jo, Changshin ; Hwang, Jongkook ; Song, Hannah ; Dao, Anh Ha ; Kim, Yong Tae ; Lee, Sang-Hyup ; Hong, Seok Won ; Yoon, Songhun ; Lee, Jinwoo. / Block-copolymer-assisted one-pot synthesis of ordered mesoporous WO 3-x/carbon nanocomposites as high-rate-performance electrodes for pseudocapacitors. In: Advanced Functional Materials. 2013 ; Vol. 23, No. 30. pp. 3747-3754.
@article{bda1c773f91b4eca9d9c00141f2f65c1,
title = "Block-copolymer-assisted one-pot synthesis of ordered mesoporous WO 3-x/carbon nanocomposites as high-rate-performance electrodes for pseudocapacitors",
abstract = "An ordered mesoporous tungsten-oxide/carbon (denoted as m-WO 3-x-C-s) nanocomposite is synthesized using a simple one-pot method using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) as a structure-directing agent. The hydrophilic PEO block interacts with the carbon and tungsten precursors (resol polymer and WCl6), and the PS block is converted to pores after heating at 700 °C under a nitrogen flow. The m-WO 3-x-C-s nanocomposite has a high Brunauer-Emmett-Teller (BET) surface area and hexagonally ordered pores. Because of its mesoporous structure and high intrinsic density of tungsten oxide, this material exhibits a high average volumetric capacitance and gravimetric capacitance as a pseudocapacitor electrode. In comparison with reduced mesoporous tungsten oxide (denoted as m-WO3-x-h), which is synthesized by a tedious hard template approach and further reduction in a H2/N2 atmosphere, m-WO 3-x-C-s shows a high capacitance and enhanced rate performance, as confirmed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The good performance of m-WO 3-x-C-s is attributed to the high surface area arising from the mesoporous structure, the large interconnected mesopores, and the low internal resistance from the well-dispersed reduced tungsten oxide and amorphous carbon composite structure. Here, the amorphous carbon acts as an electrical pathway for effective pseudocapacitor behavior of WO3-x. An ordered mesoporous tungsten-oxide/carbon (m-WO3-x-C-s) nanocomposite is synthesized using a block-copolymer-assisted one-pot self-assembly method. As a pseudocapacitor electrode, m-WO3-x-C-s exhibits a high average volumetric capacitance of 340 F cm-3 and a gravimetric capacitance of 103 F g-1. The amorphous carbon in the m-WO3-x-C-s decreases the internal resistance of m-WO3-x-C-s electrode by facilitating electric conduction.",
keywords = "carbon, electrochemical capacitors, mesoporous materials, nanocomposites, tungsten oxide",
author = "Changshin Jo and Jongkook Hwang and Hannah Song and Dao, {Anh Ha} and Kim, {Yong Tae} and Sang-Hyup Lee and Hong, {Seok Won} and Songhun Yoon and Jinwoo Lee",
year = "2013",
month = "8",
day = "12",
doi = "10.1002/adfm.201202682",
language = "English",
volume = "23",
pages = "3747--3754",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag",
number = "30",

}

TY - JOUR

T1 - Block-copolymer-assisted one-pot synthesis of ordered mesoporous WO 3-x/carbon nanocomposites as high-rate-performance electrodes for pseudocapacitors

AU - Jo, Changshin

AU - Hwang, Jongkook

AU - Song, Hannah

AU - Dao, Anh Ha

AU - Kim, Yong Tae

AU - Lee, Sang-Hyup

AU - Hong, Seok Won

AU - Yoon, Songhun

AU - Lee, Jinwoo

PY - 2013/8/12

Y1 - 2013/8/12

N2 - An ordered mesoporous tungsten-oxide/carbon (denoted as m-WO 3-x-C-s) nanocomposite is synthesized using a simple one-pot method using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) as a structure-directing agent. The hydrophilic PEO block interacts with the carbon and tungsten precursors (resol polymer and WCl6), and the PS block is converted to pores after heating at 700 °C under a nitrogen flow. The m-WO 3-x-C-s nanocomposite has a high Brunauer-Emmett-Teller (BET) surface area and hexagonally ordered pores. Because of its mesoporous structure and high intrinsic density of tungsten oxide, this material exhibits a high average volumetric capacitance and gravimetric capacitance as a pseudocapacitor electrode. In comparison with reduced mesoporous tungsten oxide (denoted as m-WO3-x-h), which is synthesized by a tedious hard template approach and further reduction in a H2/N2 atmosphere, m-WO 3-x-C-s shows a high capacitance and enhanced rate performance, as confirmed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The good performance of m-WO 3-x-C-s is attributed to the high surface area arising from the mesoporous structure, the large interconnected mesopores, and the low internal resistance from the well-dispersed reduced tungsten oxide and amorphous carbon composite structure. Here, the amorphous carbon acts as an electrical pathway for effective pseudocapacitor behavior of WO3-x. An ordered mesoporous tungsten-oxide/carbon (m-WO3-x-C-s) nanocomposite is synthesized using a block-copolymer-assisted one-pot self-assembly method. As a pseudocapacitor electrode, m-WO3-x-C-s exhibits a high average volumetric capacitance of 340 F cm-3 and a gravimetric capacitance of 103 F g-1. The amorphous carbon in the m-WO3-x-C-s decreases the internal resistance of m-WO3-x-C-s electrode by facilitating electric conduction.

AB - An ordered mesoporous tungsten-oxide/carbon (denoted as m-WO 3-x-C-s) nanocomposite is synthesized using a simple one-pot method using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) as a structure-directing agent. The hydrophilic PEO block interacts with the carbon and tungsten precursors (resol polymer and WCl6), and the PS block is converted to pores after heating at 700 °C under a nitrogen flow. The m-WO 3-x-C-s nanocomposite has a high Brunauer-Emmett-Teller (BET) surface area and hexagonally ordered pores. Because of its mesoporous structure and high intrinsic density of tungsten oxide, this material exhibits a high average volumetric capacitance and gravimetric capacitance as a pseudocapacitor electrode. In comparison with reduced mesoporous tungsten oxide (denoted as m-WO3-x-h), which is synthesized by a tedious hard template approach and further reduction in a H2/N2 atmosphere, m-WO 3-x-C-s shows a high capacitance and enhanced rate performance, as confirmed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The good performance of m-WO 3-x-C-s is attributed to the high surface area arising from the mesoporous structure, the large interconnected mesopores, and the low internal resistance from the well-dispersed reduced tungsten oxide and amorphous carbon composite structure. Here, the amorphous carbon acts as an electrical pathway for effective pseudocapacitor behavior of WO3-x. An ordered mesoporous tungsten-oxide/carbon (m-WO3-x-C-s) nanocomposite is synthesized using a block-copolymer-assisted one-pot self-assembly method. As a pseudocapacitor electrode, m-WO3-x-C-s exhibits a high average volumetric capacitance of 340 F cm-3 and a gravimetric capacitance of 103 F g-1. The amorphous carbon in the m-WO3-x-C-s decreases the internal resistance of m-WO3-x-C-s electrode by facilitating electric conduction.

KW - carbon

KW - electrochemical capacitors

KW - mesoporous materials

KW - nanocomposites

KW - tungsten oxide

UR - http://www.scopus.com/inward/record.url?scp=84881402937&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881402937&partnerID=8YFLogxK

U2 - 10.1002/adfm.201202682

DO - 10.1002/adfm.201202682

M3 - Article

VL - 23

SP - 3747

EP - 3754

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 30

ER -