Porous ZnCo 2 O 4 nanoparticles derived from a new mixed-metal organic framework for supercapacitors

Siru Chen, Ming Xue, Yanqiang Li, Ying Pan, Liangkui Zhu, Daliang Zhang, Qianrong Fang, Shilun Qiu

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

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 (ZnCo2O4) 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 ZnCo2O4 phase with a high surface area (55 cm2 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.
Original languageEnglish (US)
Pages (from-to)177-183
Number of pages7
JournalInorg. Chem. Front.
Volume2
Issue number2
DOIs
StatePublished - 2015
Externally publishedYes

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