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Phosphorus dual-site driven CoS2@S, N co-doped porous carbon nanosheets for flexible quasi-solid-state supercapacitors
Liu,Shude1; Gao,Daqiang2; Li,Junfu2; Hui,Kwan San3; Yin,Ying1,4; Hui,Kwun Nam5; Chan Jun,Seong1
2019-12
Source PublicationJournal of Materials Chemistry A
ISSN2050-7488
Volume7Issue:46Pages:26618-26630
Abstract

Battery-type electrode materials typically suffer from intrinsically slow faradaic reaction kinetics, which severely limits the energy and power density of supercapacitors. Herein, we develop a hybrid of P-doped CoS2 (P-CoS2) nanoparticles confined in highly conductive P, S, N tri-doped carbon (P, S, N-C) porous nanosheets grown on carbon fibers through in situ thermal conversion of a metal–organic framework, followed by sulfurization and phosphorization. In this structural architecture, the heteroatom-enriched porous carbon nanosheets serve as a protective coating to inhibit changes in the volume of the P-CoS2 nanoparticles and offer efficient pathways for rapid charge transfer. The nanosized P-CoS2 substantially shortens the electrolyte ion diffusion distance and shows enhanced covalency after the introduction of P atoms, resulting in decreased migration energy of electrons during the redox reaction. In particular, the P dopants exhibit improved electrical conductivity and reduced adsorption energy between OH and the nuclear Co atoms in P-CoS2, evidenced by density functional theory calculations. The designed P-CoS2@P, S, N-C electrode exhibits excellent rate capability and long-term cycling stability. Moreover, flexible solid-state asymmetric supercapacitor devices with P-CoS2@P, S, N-C as the cathode and Co@P, N-C as the anode deliver a high energy density of 56.4 W h kg−1 at 725 W kg−1 and a capacitance retention of 94.1% over 5000 cycles at 20 A g−1. The devices also exhibit uniform performance and outstanding bendability with slight capacitance decay under different bending conditions.

DOI10.1039/c9ta09646a
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000501213600044
PublisherROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Scopus ID2-s2.0-85075793023
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Cited Times [WOS]:19   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorYin,Ying; Hui,Kwun Nam; Chan Jun,Seong
Affiliation1.School of Mechanical Engineering,Yonsei University,Seoul,120-749,South Korea
2.Key Laboratory for Magnetism and Magnetic Materials of MOE,Key Laboratory of Special Function Materials and Structure Design of MOE,Lanzhou University,Lanzhou,730000,China
3.School of Engineering,University of East Anglia,Norwich,NR4 7TJ,United Kingdom
4.Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin,541004,China
5.Institute of Applied Physics and Materials Engineering,University of Macau,Taipa,Avenida da Universidade,Macao
Corresponding Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Recommended Citation
GB/T 7714
Liu,Shude,Gao,Daqiang,Li,Junfu,et al. Phosphorus dual-site driven CoS2@S, N co-doped porous carbon nanosheets for flexible quasi-solid-state supercapacitors[J]. Journal of Materials Chemistry A,2019,7(46):26618-26630.
APA Liu,Shude,Gao,Daqiang,Li,Junfu,Hui,Kwan San,Yin,Ying,Hui,Kwun Nam,&Chan Jun,Seong.(2019).Phosphorus dual-site driven CoS2@S, N co-doped porous carbon nanosheets for flexible quasi-solid-state supercapacitors.Journal of Materials Chemistry A,7(46),26618-26630.
MLA Liu,Shude,et al."Phosphorus dual-site driven CoS2@S, N co-doped porous carbon nanosheets for flexible quasi-solid-state supercapacitors".Journal of Materials Chemistry A 7.46(2019):26618-26630.
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