期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 29, 页码 14170-14177出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01186a
关键词
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资金
- National Key Research and Development Program of China [2016YFB0101204]
- National Natural Science Foundation of China [21506212, 21503227]
Porous graphitic carbons are promising candidates for energy conversion and storage. At present, it is highly desired but remains challenging to construct high-surface-area hierarchical porous graphitic carbons. Herein, graphitic carbon nanosheets with hierarchical pores are easily fabricated from a multifunctional carbonaceous precursor (pentaerythritol melamine phosphate or PMP). The PMP carbonaceous precursor can be readily converted into a 3D macroporous scaffold enclosed by carbon nanosheets via chemical foaming without any sacrificial templates and special drying procedures. Then a subsequent potassium hydroxide chemical activation process dramatically increases the surface area (up to 3853 m(2) g(-1)) and porosity (up to 2.79 cm(3) g(-1)). Simultaneously, graphitization of the carbon nanosheets was promoted with increased aromaticity and size of the polyaromatic units via breaking the phosphate ester bonds with KOH etching at a temperature as low as 800 degrees C. The resulting porous graphitic carbon nanosheets are constructed with an interconnected continuous three-dimensional network surrounded by predominantly multilayer sp(2)-bonded carbon with a dense nanometer scale pore structure. Due to such synergistic features, the resulting porous graphitic carbon nanosheets deliver 188 F g(-1) specific capacitance and excellent rate performance in nonaqueous electrolytes.
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