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dc.contributor.authorTong, Mingyu
dc.contributor.authorLiu, Shengwen
dc.contributor.authorZhang, Xian
dc.contributor.authorWu, Tianxing
dc.contributor.authorZhang, Haimin
dc.contributor.authorWang, Guozhong
dc.contributor.authorZhang, Yunxia
dc.contributor.authorZhu, Xiaoguang
dc.contributor.authorZhao, Huijun
dc.date.accessioned2018-01-05T01:00:25Z
dc.date.available2018-01-05T01:00:25Z
dc.date.issued2017
dc.identifier.issn2050-7488
dc.identifier.doi10.1039/c7ta01008g
dc.identifier.urihttp://hdl.handle.net/10072/351633
dc.description.abstractDue to their controllable morphologies, tunable porous structures, diverse compositions and easy fabrication, metal–organic frameworks (MOFs) are an ideal class of precursor material to develop high performance carbon-based materials for energy applications. In this work, two-dimensional (2D) Co/Ni MOFs nanosheets with a molar ratio of Co2+ to Ni2+ of 1 : 1 were first synthesized at room temperature using thiophene-2,5-dicarboxylate (Tdc) and 4,4′-bipyridine (4,4′-Bpy) as organic linkers. As a precursor material, the as-synthesized 2D Co/Ni MOFs nanosheets were further pyrolized at 550 °C in N2 atmosphere to incorporate 2D CoNi alloy nanoparticles into S, N-doped carbon nanosheets (CoNi@SNC) with a surface area of 224 m2 g−1, a porous structure, and good conductivity. Interestingly, it was found that the 2D Co/Ni MOFs nanosheets can be directly used as electrode materials for supercapacitors, delivering a specific capacitance of 312 F g−1 at 1 A g−1, whereas CoNi@SNC derived from its MOFs precursor as an electrode material for supercapacitors exhibits a much higher specific capacitance (1970, 1897 and 1730 F g−1 at 1, 2, 5 A g−1, respectively) with long cycling life (retaining 95.1% of the value at 10 A g−1 after 3000 cycles) and excellent rate capability at a high charge/discharge current. Further, an asymmetric supercapacitor device was constructed with CoNi@SNC as the positive electrode and active carbon as the negative electrode, exhibiting an energy density of 55.7 W h kg−1 at a power density of 0.8 kW kg−1 with lifetime stability up to 4000 charge–discharge cycles (capacitance retention of ∼90.6%). The results demonstrate that electrochemical activation-generated CoNi oxides/oxyhydroxides on the surface of the CoNi alloy nanoparticles in alkaline electrolyte during electrochemical measurements are the electrochemical active species of the CoNi@SNC-constructed supercapacitor. Additionally, the high performance of the CoNi@SNC-constructed supercapacitor can be collectively attributed to its relatively high surface area, which is favourable for the exposure of electrochemical active sites; its porous structure, which promotes redox-related mass transport; and the combination of CoNi alloy nanoparticles with graphitic carbon, which functions as an electron collector to improve electron transfer.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherRoyal Society of Chemistry
dc.relation.ispartofpagefrom9873
dc.relation.ispartofpageto9881
dc.relation.ispartofissue20
dc.relation.ispartofjournalJournal of Materials Chemistry A: Materials for Energy and Sustainability
dc.relation.ispartofvolume5
dc.subject.fieldofresearchMacromolecular and materials chemistry
dc.subject.fieldofresearchMaterials engineering
dc.subject.fieldofresearchMaterials engineering not elsewhere classified
dc.subject.fieldofresearchOther engineering
dc.subject.fieldofresearchcode3403
dc.subject.fieldofresearchcode4016
dc.subject.fieldofresearchcode401699
dc.subject.fieldofresearchcode4099
dc.titleTwo-dimensional CoNi nanoparticles@S,N-doped carbon composites derived from S,N-containing Co/Ni MOFs for high performance supercapacitors
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionAccepted Manuscript (AM)
gro.rights.copyright© 2017 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorZhao, Huijun


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