期刊
CHEMICAL ENGINEERING JOURNAL
卷 368, 期 -, 页码 51-60出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.191
关键词
Micro-mesopores; Oxalic acid; NiCo2O4/NiO/Co3O4; Electrochemical performance
资金
- Space science and technology fund [2018-HT-XG]
- Doctorate Foundation of Northwestern Polytechnical University [CX201817]
The rational design of micro-mesopores is a hugely challenging for porous metal-based nanomaterials. Here oxalic acid (H2C2O4) as control agent is proposed for the first time to prepare 3D optimal micro-mesoporous NiCo2O4/NiO/Co3O4 nanoflowers (NCNs). Theoretical and experimental analyses demonstrate NCNs-0.1 which are prepared by adding 0.1 g H2C2O4 possess optimal distribution of micro-mesopores. The optimal structure creates abundant active sites and fluent ionic channels. Beneficially, NCNs-0.1 electrodes deliver an enhanced specific capacitance of 1693F g(-1) at 1 A g(-1) and outstanding cyclic stability (88% capacitance retention after 6000 cycles). Further, the assembled NCNs-0.1//AC capacitor achieves excellent energy densities of 43.02 Wh kg(-1) at power densities of 820.29 W kg(-1). The current NCNs-0.1 confirms a practicable method to optimize the electrochemical performances of supercapacitors by utilizing H2C2O4 to construct 3D optimal micro-mesoporous nanoflower architectures.
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