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ACS Appl Mater Interfaces. 2018 Nov 21;10(46):40062-40069. doi: 10.1021/acsami.8b16921. Epub 2018 Nov 13.

N-Doped Hollow Carbon Spheres/Sheets Composite for Electrochemical Capacitor.

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College of Chemical and Pharmaceutical Engineering , Hebei University of Science and Technology , 70 Yuhua Road , Shijiazhuang 050018 , China.


Functional carbon materials with a combination of 0 dimension and 2 dimension are particularly interesting in the electrochemical field owing to the low density, high surface area, and strong ion-bearing capacity. Especially, hollow mesoporous carbon spheres (0 dimension) and nanosheet (2 dimension) composite hollow porous carbon spheres and nanosheet (HMCS/S) have received much attention as electrochemical capacitor electrode materials. However, it is challenging for effective preparation of this complex composite structure. In this work, a novel and simple procedure to prepare N-doping HMCS/S (N-HMCS/S) is presented. This approach adopted silica spheres as the core and employed [C18Mim]Br and tetraethyl orthosilicate as the structural directing agent for the formation of the flaky/spherical hybrid structure. The unique structure of nanosheets embedded by hollow carbon spheres and N-doping characteristics endow N-HMCS/S with good performance in electrochemical capacitor with high specific capacity (196.5 F g-1) in the three-electrode system and excellent high-rate capability with retention of 61.5% in the two-electrode system.


N-doped; carbon sheets; electrochemical capacitor; hollow carbon spheres; ion liquid


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