Controllable synthesis of porous NiCo2O4/NiO/Co3O4 nanoflowers for asymmetric all-solid-state supercapacitors

By Xuansheng Feng, Ying Huang, Chao Li, Xuefang Chen, Suhua Zhou, Xiaogang Gao, Chen Chen. Chemical Engineering Journal, 2019

212 citations recorded by the source corpus.

Abstract 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.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9bfac738e2b8c7f4eecfa56e03ad01eee584bcd0