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

Type
Article

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

KAUST Grant Number
CRG-1-2012-LAI-009

Date
2015

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.

Citation
Chen S, Xue M, Li Y, Pan Y, Zhu L, et al. (2015) Porous ZnCo 2 O 4 nanoparticles derived from a new mixed-metal organic framework for supercapacitors . Inorg Chem Front 2: 177–183. Available: http://dx.doi.org/10.1039/c4qi00167b.

Acknowledgements
This work was supported by the National Natural Science Foundation of China (21390394), the National Basic Research Program of China (2012CB821700), NSFC (21261130584, 11227403, 21201076, and 21101072), “111” project (B07016), Award Project of KAUST (CRG-1-2012-LAI-009), and China Scholarship Council (CSC) for a scholarship (M.X.).

Publisher
Royal Society of Chemistry (RSC)

Journal
Inorganic Chemistry Frontiers

DOI
10.1039/c4qi00167b

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