Confined pyrolysis for direct conversion of solid resin spheres into yolk–shell carbon spheres for supercapacitor. Issue 3 (19th December 2018)

• Record Type: Journal Article
• Authors: Du, Juan; Liu, Lei; Yu, Yifeng; Lv, Haijun; Zhang, Yue; Chen, Aibing
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 3(2019)
• Page Start: 1038
• Page End: 1044
• Publication Date: 2018-12-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta10266j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Confined nanospaces with different degrees of openness realized the conversion of solid resin spheres into core–shell carbon spheres with high supercapacitor performance. Abstract : Yolk–shell carbon spheres (YCS) have been widely used in many fields due to their abundant electron transport paths, high ion-accessibility and surface area as well as excellent mechanical properties. However, up to the 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 a solid resin sphere to form a confined nanospace, in which the volatile gases generated in the process of pyrolysis are deposited, forming a tunable yolk–shell structure. The results show that the YCS samples prepared in a relatively compact confined environment (YCS-C) have a thinner shell, higher surface area and richer porous structure. As electrode materials for supercapacitors, YCS-C show an excellent specific capacitance of 330 F g −1 at 0.5 A g −1 and outstanding stability with 88.5% initial capacity retention after 10 000 cyclic tests, making them promising candidates for high-performance energy storage devices.