Intense pulsed white light assisted fabrication of Co-CoOx core-shell nanoflakes on graphite felt for flexible hybrid supercapacitors

Changyong Park, Jeonguk Hwang, Yeon Taek Hwang, Chiho Song, Suhyun Ahn, Hak-Sung Kim, Heejoon Ahn

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In this work, cobalt/cobalt oxide (Co-CoOx) core-shell nanoflakes were directly grown on flexible graphite felt (GF) using a facile one-step intense pulsed white light (IPWL) irradiation method. They were then used as a battery-type positive electrode for a high-performance asymmetric hybrid supercapacitor, which exhibited high rate capability and a long cycle life. The interconnected Co-CoOx thin nanoflakes grown on the GF offer large reaction sites and enough space for easy OH ion transport due to their 3-dimensionally interconnected network structures. Cobalt metal at the core of the nanoflakes, directly connected to the current collector of the GF, provided pathways for electrons between the cobalt oxide and GF, leading to low internal resistance and high rate capability. The Co-CoOx/GF electrode had a high specific capacity of 108 mAh g−1 at a specific current of 1 A g−1 and maintained a capacity of 71 mAh g−1 at a high specific current of 20 A g−1. A two-terminal asymmetric hybrid supercapacitor, assembled using Co-CoOx/GF as the positive electrode and activated carbon as the negative electrode with gel-electrolyte (PVA/KOH), exhibited an energy density of 30.1 Wh kg−1 at a power density of 0.86 kW kg−1 and a high retention of 13.0 Wh kg−1 at a power density of 20.4 kW kg−1. In addition, the asymmetric device showed excellent cycling stability, with 114% capacity retention after 10,000 cycles.

Original languageEnglish
Pages (from-to)757-765
Number of pages9
JournalElectrochimica Acta
Volume246
DOIs
StatePublished - 2017 Aug 20

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Cobalt
Fabrication
Oxides
Electrodes
Activated carbon
Electrolytes
cobalt oxide
Supercapacitor
Life cycle
Gels
Metals
Irradiation
Ions
Electrons

Keywords

  • cobalt oxide
  • energy storage
  • hybrid supercapacitor
  • Intense pulsed white light
  • nanostructure

Cite this

@article{e3c6c9ebdd0c4166a861e4866303e2d5,
title = "Intense pulsed white light assisted fabrication of Co-CoOx core-shell nanoflakes on graphite felt for flexible hybrid supercapacitors",
abstract = "In this work, cobalt/cobalt oxide (Co-CoOx) core-shell nanoflakes were directly grown on flexible graphite felt (GF) using a facile one-step intense pulsed white light (IPWL) irradiation method. They were then used as a battery-type positive electrode for a high-performance asymmetric hybrid supercapacitor, which exhibited high rate capability and a long cycle life. The interconnected Co-CoOx thin nanoflakes grown on the GF offer large reaction sites and enough space for easy OH− ion transport due to their 3-dimensionally interconnected network structures. Cobalt metal at the core of the nanoflakes, directly connected to the current collector of the GF, provided pathways for electrons between the cobalt oxide and GF, leading to low internal resistance and high rate capability. The Co-CoOx/GF electrode had a high specific capacity of 108 mAh g−1 at a specific current of 1 A g−1 and maintained a capacity of 71 mAh g−1 at a high specific current of 20 A g−1. A two-terminal asymmetric hybrid supercapacitor, assembled using Co-CoOx/GF as the positive electrode and activated carbon as the negative electrode with gel-electrolyte (PVA/KOH), exhibited an energy density of 30.1 Wh kg−1 at a power density of 0.86 kW kg−1 and a high retention of 13.0 Wh kg−1 at a power density of 20.4 kW kg−1. In addition, the asymmetric device showed excellent cycling stability, with 114{\%} capacity retention after 10,000 cycles.",
keywords = "cobalt oxide, energy storage, hybrid supercapacitor, Intense pulsed white light, nanostructure",
author = "Changyong Park and Jeonguk Hwang and Hwang, {Yeon Taek} and Chiho Song and Suhyun Ahn and Hak-Sung Kim and Heejoon Ahn",
year = "2017",
month = "8",
day = "20",
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language = "English",
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pages = "757--765",
journal = "Electrochimica Acta",
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Intense pulsed white light assisted fabrication of Co-CoOx core-shell nanoflakes on graphite felt for flexible hybrid supercapacitors. / Park, Changyong; Hwang, Jeonguk; Hwang, Yeon Taek; Song, Chiho; Ahn, Suhyun; Kim, Hak-Sung; Ahn, Heejoon.

In: Electrochimica Acta, Vol. 246, 20.08.2017, p. 757-765.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Intense pulsed white light assisted fabrication of Co-CoOx core-shell nanoflakes on graphite felt for flexible hybrid supercapacitors

AU - Park, Changyong

AU - Hwang, Jeonguk

AU - Hwang, Yeon Taek

AU - Song, Chiho

AU - Ahn, Suhyun

AU - Kim, Hak-Sung

AU - Ahn, Heejoon

PY - 2017/8/20

Y1 - 2017/8/20

N2 - In this work, cobalt/cobalt oxide (Co-CoOx) core-shell nanoflakes were directly grown on flexible graphite felt (GF) using a facile one-step intense pulsed white light (IPWL) irradiation method. They were then used as a battery-type positive electrode for a high-performance asymmetric hybrid supercapacitor, which exhibited high rate capability and a long cycle life. The interconnected Co-CoOx thin nanoflakes grown on the GF offer large reaction sites and enough space for easy OH− ion transport due to their 3-dimensionally interconnected network structures. Cobalt metal at the core of the nanoflakes, directly connected to the current collector of the GF, provided pathways for electrons between the cobalt oxide and GF, leading to low internal resistance and high rate capability. The Co-CoOx/GF electrode had a high specific capacity of 108 mAh g−1 at a specific current of 1 A g−1 and maintained a capacity of 71 mAh g−1 at a high specific current of 20 A g−1. A two-terminal asymmetric hybrid supercapacitor, assembled using Co-CoOx/GF as the positive electrode and activated carbon as the negative electrode with gel-electrolyte (PVA/KOH), exhibited an energy density of 30.1 Wh kg−1 at a power density of 0.86 kW kg−1 and a high retention of 13.0 Wh kg−1 at a power density of 20.4 kW kg−1. In addition, the asymmetric device showed excellent cycling stability, with 114% capacity retention after 10,000 cycles.

AB - In this work, cobalt/cobalt oxide (Co-CoOx) core-shell nanoflakes were directly grown on flexible graphite felt (GF) using a facile one-step intense pulsed white light (IPWL) irradiation method. They were then used as a battery-type positive electrode for a high-performance asymmetric hybrid supercapacitor, which exhibited high rate capability and a long cycle life. The interconnected Co-CoOx thin nanoflakes grown on the GF offer large reaction sites and enough space for easy OH− ion transport due to their 3-dimensionally interconnected network structures. Cobalt metal at the core of the nanoflakes, directly connected to the current collector of the GF, provided pathways for electrons between the cobalt oxide and GF, leading to low internal resistance and high rate capability. The Co-CoOx/GF electrode had a high specific capacity of 108 mAh g−1 at a specific current of 1 A g−1 and maintained a capacity of 71 mAh g−1 at a high specific current of 20 A g−1. A two-terminal asymmetric hybrid supercapacitor, assembled using Co-CoOx/GF as the positive electrode and activated carbon as the negative electrode with gel-electrolyte (PVA/KOH), exhibited an energy density of 30.1 Wh kg−1 at a power density of 0.86 kW kg−1 and a high retention of 13.0 Wh kg−1 at a power density of 20.4 kW kg−1. In addition, the asymmetric device showed excellent cycling stability, with 114% capacity retention after 10,000 cycles.

KW - cobalt oxide

KW - energy storage

KW - hybrid supercapacitor

KW - Intense pulsed white light

KW - nanostructure

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U2 - 10.1016/j.electacta.2017.06.087

DO - 10.1016/j.electacta.2017.06.087

M3 - Article

AN - SCOPUS:85021100685

VL - 246

SP - 757

EP - 765

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -