期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 36, 页码 19088-19093出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm32759g
关键词
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资金
- National Key Basic Research and Development Program [2009CB220100]
- National Science Foundation of China [50802112, 21073233]
- National High Technology Research and Development Program [2012AA110302]
Gelatin, a renewable animal derivative composed of various proteins, was used as a precursor for nitrogen-doped porous carbon with high surface areas for supercapacitors for the first time. The preparation procedure is very simple, including the carbonization of gelatin under inert atmosphere, followed by NaOH activation of the carbonized char at 600 degrees C for 1 h. The porosity and surface chemistry of the carbon depend strongly on the weight ratio of NaOH/char, with the specific surface area and nitrogen content varying between 323 and 3012 m(2) g(-1) and between 0.88 and 9.26 at%, respectively. The unique microstructure and nitrogen functionalities enable the carbon to exhibit a high capacitance of up to 385 F g(-1) in 6 mol L-1 KOH aqueous electrolytes, attributed to the co-contribution of double layer capacitance and pseudo-capacitance. It also shows excellent rate capability (235 F g(-1) remained at 50 A g(-1)) and cycle durability, making it a promising electrode material for supercapacitors.
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