Capacitance and voltage matching between MnO2 nanoflake cathode and Fe2O3 nanoparticle anode for high-performance asymmetric micro-supercapacitors
MnO2 nanoflake, Fe2O3 nanoparticle, asymmetric electrodes, micro-supercapacitors
ABSTRACT Planar micro-supercapacitors show great potential as the energy storage unit in miniaturized electronic devices. Asymmetric structures have been widely investigated in micro-supercapacitors, and carbon-based materials are commonly applied in the electrodes. To integrate different metal oxides in both electrodes in micro-supercapacitors, the critical challenge is the pairing of different faradic metal oxides. Herein, we propose a strategy of matching the voltage and capacitance of two faradic materials that are fully integrated into one high‐performance asymmetric micro-supercapacitor by a facile and controllable fabrication process. The fabricated micro-supercapacitors employ MnO2 as the positive active material and Fe2O3 as the negative active material, respectively. The planar asymmetric micro-supercapacitors possess a high capacitance of 60 F·cm–3, a high energy density of 12 mW·h·cm–3, and a broad operation voltage range up to 1.2 V.
Tsinghua University Press
Zehua Liu,Xiaocong Tian,Xu Xu,Liang He,Mengyu Yan,Chunhua Han,Yan Li,Wei Yang,Liqiang Mai, Capacitance and voltage matching between MnO2 nanoflake cathode and Fe2O3 nanoparticle anode for high-performance asymmetric micro-supercapacitors. NanoRes.2017, 10(7): 2471–2481