Morphology controlled preparation of ZnCo2O4 nanostructures for asymmetric supercapacitor with ultrahigh energy density

Le Xu, Yan Zhao, Jiabiao Lian, Yuanguo Xu, Jian Bao, Jingxia Qiu, Li Xu, Hui Xu, Mingqing Hua and Huaming Li

Energy, 2017, vol. 123, issue C, 296-304

Abstract: Porous ZnCo2O4 nanostructures with hexamethylenetetramine (HMT) as adscititious alkali are fabricated via a facile hydrothermal route and heat treatment process. The morphology of the materials can be easily tuned from nanowires to nanobelts by simple varying the hydrothermal temperature. Due to the superiority of the porous nanostructure and the convenient ion transport, the obtained ZnCo2O4 nanostructures are further applied as electrode materials for supercapacitors and exhibit noticeable pseudocapacitive performance with high specific capacitance of 776.2 F g−1 at 1 A g−1 and good cycle stability (84.3% capacity retention at 3 A g−1). Moreover, a high-voltage asymmetric supercapacitor using the ZnCo2O4 as the anode assembled with the freeze-dried reduced graphene oxide (F-RGO) cathode displays superior electrochemical performance with an ultrahigh energy density (84.48 Wh kg−1 at 0.4 kW kg−1), which reveals a great promise for practical application in electrochemical devices.

Keywords: Asymmetric supercapacitor; ZnCo2O4; Freeze-dried RGO; Tunable morphologies; High energy density (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:123:y:2017:i:c:p:296-304

DOI: 10.1016/j.energy.2017.02.018

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