期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 48, 页码 33060-33071出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10893
关键词
hierarchical structured carbons; Moringa oleifera; electrode materials; supercapacitors; cycling stability; heteroatom doping
资金
- National Natural Science Foundation of China [21571066, U1501242, 21371061]
- Key Program of Science Technology Innovation Foundation of Universities of Guangdong Province [cxzd1113]
- Science and Technology Project of Guangdong Province [2014A010105038]
- Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University), Ministry of Education, China
- China Scholarship Council
In this paper, we demonstrate that Moringa oleifera branches, a renewable biomass waste with abundant protein content, can be employed as novel precursor to synthesize three-dimensional heteroatom-doped and hierarchical egg-box-like carbons (HEBLCs) by a facile room temperature pretreatment and direct pyrolysis process. The as-prepared HEBLCs possess unique egg-box-like frameworks, high surface area, and interconnected porosity as well as the doping of heteroatoms (oxygen and nitrogen), endowing its excellent electrochemical performances (superior capacity, high rate capability, and outstanding cycling stability). Therefore, the resultant HEBLC manifests a maximum specific capacitance of 355 F g(-1) at current density of 0.5 A g(-1) and remarkable rate performance. Moreover, 95% of capacitance retention of HEBLCs can be also achieved after 20 000 charge-discharge cycles at an extremely high current density (20 A g(-1)), indicating a prominent cycling stability. Furthermore, the as assembled HEBLC//HEBLC symmetric supercapacitor displays a superior energy density of 20 Wh kg(-1) in aqueous electrolyte and remarkable capacitance retention (95.6%) after 10 000 charge discharge cycles. This work provides an environmentally friendly and reliable method to produce higher-valued carbon nanomaterials from renewable biomass wastes for energy storage applications.
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