A Novel Layered Sedimentary Rocks Structure of the Oxygen-Enriched Carbon for Ultrahigh-Rate-Performance Supercapacitors

详细信息    查看全文

• 作者：Lin-Lin Zhang ; Huan-Huan Li ; Yan-Hong Shi ; Chao-Ying Fan ; Xing-Long Wu ; Hai-Feng Wang ; Hai-Zhu Sun ; Jing-Ping Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 17, 2016
• 年：2016
• 卷：8
• 期：6
• 页码：4233-4241
• 全文大小：631K
• ISSN：1944-8252

文摘

In this paper, gelatin as a natural biomass was selected to successfully prepare an oxygen-enriched carbon with layered sedimentary rocks structure, which exhibited ultrahigh-rate performance and excellent cycling stability as supercapacitors. The specific capacitance reached 272.6 F g^–1 at 1 A g^–1 and still retained 197.0 F g^–1 even at 100 A g^–1 (with high capacitance retention of 72.3%). The outstanding electrochemical performance resulted from the special layered structure with large surface area (827.8 m² g^–1) and high content of oxygen (16.215 wt %), which effectively realized the synergistic effects of the electrical double-layer capacitance and pseudocapacitance. Moreover, it delivered an energy density of 25.3 Wh kg^–1 even with a high power density of 34.7 kW kg^–1 and ultralong cycling stability (with no capacitance decay even over 10 000 cycles at 2 A g^–1) in a symmetric supercapacitor, which are highly desirable for their practical application in energy storage devices and conversion.