dc.contributor.author | Tong, Mingyu | |
dc.contributor.author | Liu, Shengwen | |
dc.contributor.author | Zhang, Xian | |
dc.contributor.author | Wu, Tianxing | |
dc.contributor.author | Zhang, Haimin | |
dc.contributor.author | Wang, Guozhong | |
dc.contributor.author | Zhang, Yunxia | |
dc.contributor.author | Zhu, Xiaoguang | |
dc.contributor.author | Zhao, Huijun | |
dc.date.accessioned | 2018-01-05T01:00:25Z | |
dc.date.available | 2018-01-05T01:00:25Z | |
dc.date.issued | 2017 | |
dc.identifier.issn | 2050-7488 | |
dc.identifier.doi | 10.1039/c7ta01008g | |
dc.identifier.uri | http://hdl.handle.net/10072/351633 | |
dc.description.abstract | Due 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.peerreviewed | Yes | |
dc.language | English | |
dc.language.iso | eng | |
dc.publisher | Royal Society of Chemistry | |
dc.relation.ispartofpagefrom | 9873 | |
dc.relation.ispartofpageto | 9881 | |
dc.relation.ispartofissue | 20 | |
dc.relation.ispartofjournal | Journal of Materials Chemistry A: Materials for Energy and Sustainability | |
dc.relation.ispartofvolume | 5 | |
dc.subject.fieldofresearch | Macromolecular and materials chemistry | |
dc.subject.fieldofresearch | Materials engineering | |
dc.subject.fieldofresearch | Materials engineering not elsewhere classified | |
dc.subject.fieldofresearch | Other engineering | |
dc.subject.fieldofresearchcode | 3403 | |
dc.subject.fieldofresearchcode | 4016 | |
dc.subject.fieldofresearchcode | 401699 | |
dc.subject.fieldofresearchcode | 4099 | |
dc.title | Two-dimensional CoNi nanoparticles@S,N-doped carbon composites derived from S,N-containing Co/Ni MOFs for high performance supercapacitors | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dc.type.code | C - Journal Articles | |
dc.description.version | Accepted 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.hasfulltext | Full Text | |
gro.griffith.author | Zhao, Huijun | |