期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 6, 页码 4233-4241出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b12484
关键词
layered sedimentary rocks structure; biomass; oxygen-enriched; ultrahigh-rate performance; symmetric supercapacitor
资金
- NSFC [21573036, 21574018, 21274017, 51433003]
- Jilin Provincial Key Laboratory of Advanced Energy Materials (Northeast Normal University)
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 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 m(2) 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.
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