Synthesis of Interconnected Hollow Carbon Nanospheres with Controllable In Situ N‐Doping Level for Supercapacitors
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Abstract Nitrogen‐doped hollow carbon spheres (HCSs) are regarded as ideal supercapacitors electrode materials due to their excellent electrochemical properties. However, studies of nitrogen doping at different levels based on precise structure control are rarely reported so far. Herein, we controllably prepared hollow carbon nanospheres with carbon walls connected by a hard template method and used the difference in the number of nitrogen‐containing functional groups in the precursor to control the nitrogen doping amount of carbon nanospheres. Interestingly, with the N‐doped content increasing, the specific capacitance of supercapacitors shows accordingly upward tendency by the better electrode interface environment. Compared to the control group (lower amount nitrogen‐doping), the highest N‐contained HCSs (NIHCSs‐2) shows the best electrochemical performance (256 F g −1 ) in supercapacitors. The excellent electrochemical behaviour of NIHCSs‐2 demonstrates that hollow carbon nanospheres with high nitrogen content have great potential in electrochemical energy storage device applications.Keywords:
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Abstract A three‐component, flexible electrode is developed for supercapacitors over graphitized carbon fabric, utilizing γ‐MnO 2 nanoflowers anchored onto carbon nanotubes (γ‐MnO 2 /CNT) as spacers for graphene nanosheets (GNs). The three‐component, composite electrode doubles the specific capacitance with respect to GN‐only electrodes, giving the highest‐reported specific capacitance (308 F g −1 ) for symmetric supercapacitors containing MnO 2 and GNs using a two‐electrode configuration, at a scan rate of 20 mV s −1 . A maximum energy density of 43 W h kg −1 is obtained for our symmetric supercapacitors at a constant discharge‐current density of 2.5 A g −1 using GN–(γ‐MnO 2 /CNT)‐nanocomposite electrodes. The fabricated supercapacitor device exhibits an excellent cycle life by retaining ≈90% of the initial specific capacitance after 5000 cycles.
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