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Facile synthesis of manganese carbonate quantum dots/Ni(HCO3)2-MnCO3 composites as advanced cathode materials for high energy density asymmetric supercapacitors
Xia Q.X.2; San Hui K.4; Hui K.N.2; Kim S.D.1; Lim J.H.1; Choi S.Y.1; Zhang L.J.4; Mane R.S.3; Yun J.M.2; Kim K.H.2
2015-09-09
Source PublicationJournal of Materials Chemistry A
ISSN20507496 20507488
Volume3Issue:44Pages:22102-22117
Abstract

We have developed a high performance supercapacitor cathode electrode composed of well dispersed MnCO quantum dots (QDs, ∼1.2 nm) decorated on nickel hydrogen carbonate-manganese carbonate (Ni(HCO)-MnCO) hedgehog-like shell@needle (MnCO QDs/NiH-Mn-CO) composites directly grown onto a 3D macro-porous nickel foam as a binder-free supercapacitor electrode by a facile and scalable hydrothermal method. The MnCO QDs/NiH-Mn-CO composite electrode exhibited a remarkable maximum specific capacitance of 2641.3 F g at 3 A g and 1493.3 F g at 15 A g. Moreover, the asymmetric supercapacitor with MnCO QDs/NiH-Mn-CO composites as the positive electrode and graphene as the negative electrode showed an energy density of 58.1 W h kg at a power density of 900 W kg as well as excellent cycling stability with 91.3% retention after 10 000 cycles, which exceeded the energy densities of most previously reported nickel or manganese oxide/hydroxide-based asymmetric supercapacitors. The ultrahigh capacitive performance is attributed to the presence of the high surface area core-shell nanostructure, the well dispersed MnCO quantum dots, and the high conductivity of MnCO quantum dots as well as the synergetic effect between multiple transition metal ions. The superior supercapacitive performance of the MnCO QDs/NiH-Mn-CO composites makes them promising cathode materials for high energy density asymmetric supercapacitors.

DOI10.1039/c5ta04005a
URLView the original
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Materials Science ; Energy & Fuels
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000364080400020
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Cited Times [WOS]:79   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Affiliation1.Korea Institute of Materials Science
2.Pusan National University
3.Swami Ramanand Teerth Marathwada University
4.Hanyang University
Recommended Citation
GB/T 7714
Xia Q.X.,San Hui K.,Hui K.N.,et al. Facile synthesis of manganese carbonate quantum dots/Ni(HCO3)2-MnCO3 composites as advanced cathode materials for high energy density asymmetric supercapacitors[J]. Journal of Materials Chemistry A,2015,3(44):22102-22117.
APA Xia Q.X..,San Hui K..,Hui K.N..,Kim S.D..,Lim J.H..,...&Kim K.H..(2015).Facile synthesis of manganese carbonate quantum dots/Ni(HCO3)2-MnCO3 composites as advanced cathode materials for high energy density asymmetric supercapacitors.Journal of Materials Chemistry A,3(44),22102-22117.
MLA Xia Q.X.,et al."Facile synthesis of manganese carbonate quantum dots/Ni(HCO3)2-MnCO3 composites as advanced cathode materials for high energy density asymmetric supercapacitors".Journal of Materials Chemistry A 3.44(2015):22102-22117.
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