Manganese oxide doping carbon aerogels prepared with MnO2 coordinated by N, N - dimethylmethanamide for supercapacitors
Carbon aerogels with excellent conductive characteristics and high specific capacitance have attracted more and more interests for next-generation energy storage applications. Three-dimensional interconnected Mn 2 O 3 /carbon aerogel supercapacitor electrodes are prepared by a novel doping method using MnO 2 coordinated by N, N-dimethylmethanamide (DMF). The coordinative MnO 2 (DMF/MnO 2 ) plays a key role in the sol-gel process of resorcinol and formaldehyde. The doped carbon aerogels exhibits a high specific surface area of 859 m 2 g −1 and a good pore-size distribution of 10–15 nm. All of the doped carbon aerogels exhibit higher specific capacitance than pure carbon aerogels, and the highest specific capacitance (170 F g −1 ), at current density of 1.0 A g −1 , is obtained in Mn–CA–5% when 5 mol% DMF/MnO 2 is added to the precursor solution. The specific capacitance is as high as 100 F g −1 , at current density of 10.0 A g −1 , and 97% of initial capacitance is retained over 1000 cycles at a current density of 5.0 A g −1 . The doped carbon aerogels exhibits a high coulombic efficiency (up to 99.8%) and a good rate capability. The corresponding result is due to the novel doping method of DMF/MnO 2 addition.
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