Porous ZnCo2O4 nanoparticles derived from a new mixed-metal organic framework for supercapacitors. Issue 2 (12th January 2015)

• Record Type: Journal Article
• Authors: Chen, Siru; Xue, Ming; Li, Yanqiang; Pan, Ying; Zhu, Liangkui; Zhang, Daliang; Fang, Qianrong; Qiu, Shilun
• Is Part Of: Inorganic chemistry frontiers. Volume 2:Issue 2(2015)
• Page Start: 177
• Page End: 183
• Publication Date: 2015-01-12
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c4qi00167b
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : ZnCo2 O4 nanoparticles were synthesized by thermal annealing of a new mixed-metal MOF and show high capacitance for electrochemical capacitors. Abstract : Cobalt-based oxides have been shown to be promising materials for application in high-energy-density Li-ion batteries and supercapacitors. In this paper, we report a new and simple strategy for the synthesis of a mixed-metal spinel phase (ZnCo2 O4 ) from a zinc and cobalt mixed-metal organic framework (JUC-155 ). It is important to rationally design a MOF with a precise ratio (Co/Zn) and a synthetic process that is simple and time saving. After solid-state annealing of the mixed-metal MOF precursor at 400 °C for two hours, a pure ZnCo2 O4 phase with a high surface area (55 cm 2 g −1 ) was obtained. When used as electrode materials for supercapacitors, an exceptionally high specific capacitance of 451 F g −1 was obtained at the scan rate of 5 mV s −1 . The capacitance loss after 1500 cycles was only 2.1% at a current density of 2 A g −1, indicating that this phase has an excellent cycling stability. These remarkable electrochemical performances suggest that this phase is potentially promising for application as an efficient electrode in electrochemical capacitors.