Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors

Shude Liu, Ying Yin, Dixing Ni, Kwan San Hui, Kwun Nam Hui, Suchan Lee, Chu Ying Ouyang, Seong Chan Jun

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The intrinsically poor electrical conductivity and insufficient number of electrochemically active sites of transition-metal oxides hamper their wide application in high-performance supercapacitors. Herein, we demonstrate an effective strategy of creating phosphorus-containing cobalt molybdate (CoMoO4) with oxygen vacancies (P-CoMoO4-x) on nickel foam for use as a supercapacitor electrode. Experimental analyses and theoretical calculations reveal that the electronic structure of P-CoMoO4-x can be efficiently modulated by incorporating P heteroatoms and O vacancies, thereby simultaneously reducing the energy band gap and increasing electrical conductivity. Moreover, incorporating P into P-CoMoO4-x weakens the Co–O bond energy and induces the low oxidation states of molybdenum species, facilitating surface redox chemistry and improving electrochemical performance. Accordingly, the optimized P-CoMoO4-x electrode exhibits a high specific capacity of 1368 C g−1 at a current density of 2 A g−1, and it retains 95.3% of the initial capacity after 5000 cycles at a high current density of 10 A g−1. An asymmetric supercapacitor assembled with the optimized P-CoMoO4-x as positive electrode and activated carbon as negative electrode delivers a high energy density of 58 W h kg−1 at a power density of 850 W kg−1 as well as achieves excellent cycling lifespan.

Original languageEnglish
Pages (from-to)186-196
Number of pages11
JournalEnergy Storage Materials
Volume19
DOIs
Publication statusPublished - 2019 May

Fingerprint

Cobalt
Oxygen
Electrodes
Current density
Molybdenum
Oxygen vacancies
Nickel
Band structure
Activated carbon
Phosphorus
Oxides
Vacancies
Electronic structure
Transition metals
Foams
Energy gap
Oxidation
Supercapacitor
molybdate
Electric Conductivity

All Science Journal Classification (ASJC) codes

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

Cite this

Liu, Shude ; Yin, Ying ; Ni, Dixing ; Hui, Kwan San ; Hui, Kwun Nam ; Lee, Suchan ; Ouyang, Chu Ying ; Jun, Seong Chan. / Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors. In: Energy Storage Materials. 2019 ; Vol. 19. pp. 186-196.
@article{5de9d3476d0f4d5aafd518b38c80dc7c,
title = "Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors",
abstract = "The intrinsically poor electrical conductivity and insufficient number of electrochemically active sites of transition-metal oxides hamper their wide application in high-performance supercapacitors. Herein, we demonstrate an effective strategy of creating phosphorus-containing cobalt molybdate (CoMoO4) with oxygen vacancies (P-CoMoO4-x) on nickel foam for use as a supercapacitor electrode. Experimental analyses and theoretical calculations reveal that the electronic structure of P-CoMoO4-x can be efficiently modulated by incorporating P heteroatoms and O vacancies, thereby simultaneously reducing the energy band gap and increasing electrical conductivity. Moreover, incorporating P into P-CoMoO4-x weakens the Co–O bond energy and induces the low oxidation states of molybdenum species, facilitating surface redox chemistry and improving electrochemical performance. Accordingly, the optimized P-CoMoO4-x electrode exhibits a high specific capacity of 1368 C g−1 at a current density of 2 A g−1, and it retains 95.3{\%} of the initial capacity after 5000 cycles at a high current density of 10 A g−1. An asymmetric supercapacitor assembled with the optimized P-CoMoO4-x as positive electrode and activated carbon as negative electrode delivers a high energy density of 58 W h kg−1 at a power density of 850 W kg−1 as well as achieves excellent cycling lifespan.",
author = "Shude Liu and Ying Yin and Dixing Ni and Hui, {Kwan San} and Hui, {Kwun Nam} and Suchan Lee and Ouyang, {Chu Ying} and Jun, {Seong Chan}",
year = "2019",
month = "5",
doi = "10.1016/j.ensm.2018.10.022",
language = "English",
volume = "19",
pages = "186--196",
journal = "Energy Storage Materials",
issn = "2405-8297",
publisher = "Elsevier BV",

}

Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors. / Liu, Shude; Yin, Ying; Ni, Dixing; Hui, Kwan San; Hui, Kwun Nam; Lee, Suchan; Ouyang, Chu Ying; Jun, Seong Chan.

In: Energy Storage Materials, Vol. 19, 05.2019, p. 186-196.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors

AU - Liu, Shude

AU - Yin, Ying

AU - Ni, Dixing

AU - Hui, Kwan San

AU - Hui, Kwun Nam

AU - Lee, Suchan

AU - Ouyang, Chu Ying

AU - Jun, Seong Chan

PY - 2019/5

Y1 - 2019/5

N2 - The intrinsically poor electrical conductivity and insufficient number of electrochemically active sites of transition-metal oxides hamper their wide application in high-performance supercapacitors. Herein, we demonstrate an effective strategy of creating phosphorus-containing cobalt molybdate (CoMoO4) with oxygen vacancies (P-CoMoO4-x) on nickel foam for use as a supercapacitor electrode. Experimental analyses and theoretical calculations reveal that the electronic structure of P-CoMoO4-x can be efficiently modulated by incorporating P heteroatoms and O vacancies, thereby simultaneously reducing the energy band gap and increasing electrical conductivity. Moreover, incorporating P into P-CoMoO4-x weakens the Co–O bond energy and induces the low oxidation states of molybdenum species, facilitating surface redox chemistry and improving electrochemical performance. Accordingly, the optimized P-CoMoO4-x electrode exhibits a high specific capacity of 1368 C g−1 at a current density of 2 A g−1, and it retains 95.3% of the initial capacity after 5000 cycles at a high current density of 10 A g−1. An asymmetric supercapacitor assembled with the optimized P-CoMoO4-x as positive electrode and activated carbon as negative electrode delivers a high energy density of 58 W h kg−1 at a power density of 850 W kg−1 as well as achieves excellent cycling lifespan.

AB - The intrinsically poor electrical conductivity and insufficient number of electrochemically active sites of transition-metal oxides hamper their wide application in high-performance supercapacitors. Herein, we demonstrate an effective strategy of creating phosphorus-containing cobalt molybdate (CoMoO4) with oxygen vacancies (P-CoMoO4-x) on nickel foam for use as a supercapacitor electrode. Experimental analyses and theoretical calculations reveal that the electronic structure of P-CoMoO4-x can be efficiently modulated by incorporating P heteroatoms and O vacancies, thereby simultaneously reducing the energy band gap and increasing electrical conductivity. Moreover, incorporating P into P-CoMoO4-x weakens the Co–O bond energy and induces the low oxidation states of molybdenum species, facilitating surface redox chemistry and improving electrochemical performance. Accordingly, the optimized P-CoMoO4-x electrode exhibits a high specific capacity of 1368 C g−1 at a current density of 2 A g−1, and it retains 95.3% of the initial capacity after 5000 cycles at a high current density of 10 A g−1. An asymmetric supercapacitor assembled with the optimized P-CoMoO4-x as positive electrode and activated carbon as negative electrode delivers a high energy density of 58 W h kg−1 at a power density of 850 W kg−1 as well as achieves excellent cycling lifespan.

UR - http://www.scopus.com/inward/record.url?scp=85056728966&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056728966&partnerID=8YFLogxK

U2 - 10.1016/j.ensm.2018.10.022

DO - 10.1016/j.ensm.2018.10.022

M3 - Article

AN - SCOPUS:85056728966

VL - 19

SP - 186

EP - 196

JO - Energy Storage Materials

JF - Energy Storage Materials

SN - 2405-8297

ER -