New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co 2 MnO 4 for flexible quasi-solid-state asymmetric supercapacitors

Shude Liu, Ying Yin, Dixing Ni, Kwan San Hui, Ming Ma, Sewon Park, Kwun Nam Hui, Chu Ying Ouyang, Seong Chan Jun

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Anion doping and oxygen-defect creation have been extensively employed to modify the electronic properties and increase concentration of electrochemically active sites of electrode materials for electrical energy storage technologies; however, comprehensive study of the roles of anion doping and oxygen vacancy on the enhancement of electrochemical performance is not clear. Herein, we provide new insight into the effect of fluorine dopant and oxygen vacancy on electrochemical performance of fluorine-doped oxygen-deficient Co 2 MnO 4 (F-Co 2 MnO 4-x ) nanowires grown on carbon fiber (CF) as advanced electrode materials for supercapacitor. An experimental and theoretical study reveals that the structural and electronic properties in F-Co 2 MnO 4-x is effectively tuned by introducing F dopants and oxygen vacancies, synergistically increasing electrical conductivity and providing rich Faradaic redox chemistry. The resultant F-Co 2 MnO 4-x achieves a high specific capacity of 269 mA h g −1 at 1 A g −1 , and superior cyclic stability with 93.2% capacity retention after 5000 cycles at 15 A g −1 . A flexible quasi-solid-state asymmetric supercapacitor (ASC) is constructed with F-Co 2 MnO 4-x /CF as the positive electrode and Fe 2 O 3 /CF as the negative electrode. The ASC device exhibits a high energy density of 64.4 W h kg −1 at a power density of 800 W kg −1 . Significantly, the device yields 89.9% capacitance retention after 2000 bending tests at a bending angle ranging from 0 to 30°, demonstrating the high integration of excellent mechanical flexibility and cycling stability.

Original languageEnglish
JournalEnergy Storage Materials
DOIs
Publication statusPublished - 2019 Jan 1

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Fluorine
Oxygen vacancies
Doping (additives)
Carbon fibers
Electrodes
Electronic properties
Anions
Negative ions
Oxygen
Bending tests
Energy storage
Nanowires
Structural properties
Capacitance
Defects
Supercapacitor
carbon fiber

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

Cite this

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title = "New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co 2 MnO 4 for flexible quasi-solid-state asymmetric supercapacitors",
abstract = "Anion doping and oxygen-defect creation have been extensively employed to modify the electronic properties and increase concentration of electrochemically active sites of electrode materials for electrical energy storage technologies; however, comprehensive study of the roles of anion doping and oxygen vacancy on the enhancement of electrochemical performance is not clear. Herein, we provide new insight into the effect of fluorine dopant and oxygen vacancy on electrochemical performance of fluorine-doped oxygen-deficient Co 2 MnO 4 (F-Co 2 MnO 4-x ) nanowires grown on carbon fiber (CF) as advanced electrode materials for supercapacitor. An experimental and theoretical study reveals that the structural and electronic properties in F-Co 2 MnO 4-x is effectively tuned by introducing F dopants and oxygen vacancies, synergistically increasing electrical conductivity and providing rich Faradaic redox chemistry. The resultant F-Co 2 MnO 4-x achieves a high specific capacity of 269 mA h g −1 at 1 A g −1 , and superior cyclic stability with 93.2{\%} capacity retention after 5000 cycles at 15 A g −1 . A flexible quasi-solid-state asymmetric supercapacitor (ASC) is constructed with F-Co 2 MnO 4-x /CF as the positive electrode and Fe 2 O 3 /CF as the negative electrode. The ASC device exhibits a high energy density of 64.4 W h kg −1 at a power density of 800 W kg −1 . Significantly, the device yields 89.9{\%} capacitance retention after 2000 bending tests at a bending angle ranging from 0 to 30°, demonstrating the high integration of excellent mechanical flexibility and cycling stability.",
author = "Shude Liu and Ying Yin and Dixing Ni and Hui, {Kwan San} and Ming Ma and Sewon Park and Hui, {Kwun Nam} and Ouyang, {Chu Ying} and Jun, {Seong Chan}",
year = "2019",
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day = "1",
doi = "10.1016/j.ensm.2019.02.014",
language = "English",
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New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co 2 MnO 4 for flexible quasi-solid-state asymmetric supercapacitors . / Liu, Shude; Yin, Ying; Ni, Dixing; Hui, Kwan San; Ma, Ming; Park, Sewon; Hui, Kwun Nam; Ouyang, Chu Ying; Jun, Seong Chan.

In: Energy Storage Materials, 01.01.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co 2 MnO 4 for flexible quasi-solid-state asymmetric supercapacitors

AU - Liu, Shude

AU - Yin, Ying

AU - Ni, Dixing

AU - Hui, Kwan San

AU - Ma, Ming

AU - Park, Sewon

AU - Hui, Kwun Nam

AU - Ouyang, Chu Ying

AU - Jun, Seong Chan

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Anion doping and oxygen-defect creation have been extensively employed to modify the electronic properties and increase concentration of electrochemically active sites of electrode materials for electrical energy storage technologies; however, comprehensive study of the roles of anion doping and oxygen vacancy on the enhancement of electrochemical performance is not clear. Herein, we provide new insight into the effect of fluorine dopant and oxygen vacancy on electrochemical performance of fluorine-doped oxygen-deficient Co 2 MnO 4 (F-Co 2 MnO 4-x ) nanowires grown on carbon fiber (CF) as advanced electrode materials for supercapacitor. An experimental and theoretical study reveals that the structural and electronic properties in F-Co 2 MnO 4-x is effectively tuned by introducing F dopants and oxygen vacancies, synergistically increasing electrical conductivity and providing rich Faradaic redox chemistry. The resultant F-Co 2 MnO 4-x achieves a high specific capacity of 269 mA h g −1 at 1 A g −1 , and superior cyclic stability with 93.2% capacity retention after 5000 cycles at 15 A g −1 . A flexible quasi-solid-state asymmetric supercapacitor (ASC) is constructed with F-Co 2 MnO 4-x /CF as the positive electrode and Fe 2 O 3 /CF as the negative electrode. The ASC device exhibits a high energy density of 64.4 W h kg −1 at a power density of 800 W kg −1 . Significantly, the device yields 89.9% capacitance retention after 2000 bending tests at a bending angle ranging from 0 to 30°, demonstrating the high integration of excellent mechanical flexibility and cycling stability.

AB - Anion doping and oxygen-defect creation have been extensively employed to modify the electronic properties and increase concentration of electrochemically active sites of electrode materials for electrical energy storage technologies; however, comprehensive study of the roles of anion doping and oxygen vacancy on the enhancement of electrochemical performance is not clear. Herein, we provide new insight into the effect of fluorine dopant and oxygen vacancy on electrochemical performance of fluorine-doped oxygen-deficient Co 2 MnO 4 (F-Co 2 MnO 4-x ) nanowires grown on carbon fiber (CF) as advanced electrode materials for supercapacitor. An experimental and theoretical study reveals that the structural and electronic properties in F-Co 2 MnO 4-x is effectively tuned by introducing F dopants and oxygen vacancies, synergistically increasing electrical conductivity and providing rich Faradaic redox chemistry. The resultant F-Co 2 MnO 4-x achieves a high specific capacity of 269 mA h g −1 at 1 A g −1 , and superior cyclic stability with 93.2% capacity retention after 5000 cycles at 15 A g −1 . A flexible quasi-solid-state asymmetric supercapacitor (ASC) is constructed with F-Co 2 MnO 4-x /CF as the positive electrode and Fe 2 O 3 /CF as the negative electrode. The ASC device exhibits a high energy density of 64.4 W h kg −1 at a power density of 800 W kg −1 . Significantly, the device yields 89.9% capacitance retention after 2000 bending tests at a bending angle ranging from 0 to 30°, demonstrating the high integration of excellent mechanical flexibility and cycling stability.

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