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Confined pyrolysis for direct conversion of solid resin sphere into yolk-shell carbon spheres for supercapacitor

Abstract

Yolk-shell carbon spheres (YCS) have been widely used in many fields due to their abundant electron transport path high ion-accessible and surface area as well as excellent mechanical properties. However, at present, the preparation of yolk-shell carbon spheres with tunable structures has always been a challenge. Herein, the direct conversion of solid resin spheres into YCS is achieved by a facile confined pyrolysis strategy. A silica shell with different degrees of openness is built on the surface of solid resin sphere to form a confined nanospace, in which the volatile gases generated in the process of pyrolysis deposit, forming a tunable yolk-shell structure. The results show that the YCS samples prepared in relative compact confined environment (YCS-C) have thinner shell, higher surface area and richer porous structure. As electrode materials for supercapacitor, YCS-C shows excellent specific capacitance of 330 F g-1 at 0.5 A g-1 and outstand stability with 88.5 % initial capacity retention after 10000 cyclic tests, representing its promising candidate for high-performance energy storage devices.

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Publication details

The article was received on 25 Oct 2018, accepted on 06 Dec 2018 and first published on 07 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10266J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Confined pyrolysis for direct conversion of solid resin sphere into yolk-shell carbon spheres for supercapacitor

    J. Du, L. Liu, Y. Yu, H. Lv, Y. Zhang and A. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10266J

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