Porous dimanganese trioxide microflowers derived from microcoordinations for flexible solid-state asymmetric supercapacitors?

Nanoscale Pub Date: 2016-05-12 DOI: 10.1039/C6NR02267G

Abstract

Dimanganese trioxide microflowers are easily obtained from a Mn(II) 8-hydroxyquinoline microcoordination after calcination in air. We also look into the possible formation mechanism of the flower-like morphology, and find that the reaction time affects the morphology of the coordination. Furthermore, the as-prepared porous Mn2O3 microflowers are made of many nanoplates which form many nanogaps and nanochannels. Interestingly, the assembled electrode based on the as-prepared porous Mn2O3 microflowers proves to be a high-performance electrode material for supercapacitors. The electrode shows a specific capacitance of 994 F g?1, which can work well even after 4000 cycles at 0.75 A g?1. More importantly, the porous Mn2O3 microflowers and activated carbons are assembled into a high-performance flexible solid-state asymmetric supercapacitor with a specific capacitance of 312.5 mF cm?2. The cycle test shows that the device can offer 95.6% capacity of the initial capacitance at 2.0 mA cm?2 after 5000 cycles with little decay. The maximum energy density of the device can achieve 6.56 mWh cm?3 and the maximum power density can also achieve 283.5 mW cm?3, which are among the best results for manganese based materials.

Graphical abstract: Porous dimanganese trioxide microflowers derived from microcoordinations for flexible solid-state asymmetric supercapacitors
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