کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5431556 | 1508824 | 2017 | 9 صفحه PDF | دانلود رایگان |
In this paper, we focus on an innovative sulfur doping method with MOF-5 and inorganic sulfur powders as templated carbon precursor and sulfur source, in which sulfur powders were firstly encapsulated into the abundant pore structure of MOF-5 and then sulfur doping process could be realized through further pyrolysis treatment. Based on the results of material characterization, sulfur-doped mesoporous carbon (SPC) holds an amorphous structure with an enlarged interlayer distance of 0.386Â nm and a mesoporous size distribution of 3-6Â nm, while sulfur atoms existing in SPC (2.5Â at.%) are mainly in the form of thiophene-type bonds (CSC and CS). Benefitting from the structural advantages, SPC electrode could display a long-term cycling stability with a reversible capacity of 173.7Â mAh gâ1 at 200Â mAÂ gâ1 after 500 cycles and an outstanding rate capability of 104.9 and 90Â mAh gâ1 even the current raised up to 1.6 and 3.2Â AÂ gâ1, respectively. The enhanced electrochemical performances could be mainly attributed to the introduction of S atoms into carbon structure, which can effectively enlarge the interlayer distance, improve the electronic conductivity and promote the insertion/extraction process of sodium storage.
An amorphous structure sulfur-doped mesoporous carbon (SPC) material with an enlarged interlayer distance of 0.386Â nm has been prepared with MOF-5 and inorganic sulfur powder as carbon template and sulfur source, respectively. The introduction of sulfur atoms into carbon structure is beneficial for the enhanced electrochemical properties with a long-term cycling stability and outstanding rate capability.380
Journal: Carbon - Volume 123, October 2017, Pages 250-258