期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 6, 页码 5717-5726出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05024
关键词
Hierarchical porous carbon; Green and efficient method; Nitrogen/phosphorus codoping; Supercapacitors; Electrode materials
资金
- National Natural Science Foundation of China [21773217]
- National Key R&D Program of China [2018YFF0215404]
- Wuhan Science & Technology Project [2018010401011276]
- Natural Science Foundation of Hubei Province [2015CFB187]
- Open Fund of the Guangdong Provincial Key Laboratory of Advance Energy Storage Materials [AESM201815]
Multiple heteroatom doping represents an effective strategy for improving the supercapacitive performance of carbon electrodes due to its combined merits of pseudocapacitance and double layer capacitance. However, a green and efficient approach for generating heteroatoms codoped carbons which simultaneously possess high-level heteroatom-doping and moderate porosity remains a big challenge. Here, we put forward a CaCO3-assistant technique for the fabrication of nitrogen/phosphorus codoped hierarchical porous carbons (NPHCs). The as-prepared 1NPHC-850 integrates the structural characteristics of high-level heteroatom-doping (8.72 at. % for N, 4.44 at. % for P, and 10.24 at. % for O), large surface area (up to 414 m(2) g(-1)), and triple micromeso-macro pore structure. It exhibits a high specific capacitance of 212 F g(-1) at 0.5 A g(-1) and an excellent rate performance with a capacitance ratio of 75% at 20 A g(-1). Moreover, the 1NPHC-850-based symmetrical supercapacitor device could achieve a high energy density of 10.61 Wh kg(-1) in aqueous electrolyte and an ultralong cycling life (capacitance retention of 86.3% after 10,000 cycles). Our work not only offers a facile strategy to produce advanced multiple heteroatom-doped carbon materials but also provides reference for rational regulation of chemical composition and pore structure in pursuit of better carbon electrodes for supercapacitors.
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