物理化学学报Issue(6)：1127-1133,7.DOI:10.3866/PKU.WHXB201404013
热处理温度对沥青基硼氮共掺杂多孔炭结构与电化学性能的影响
Influence of Heat Treatment Temperature on the Structure and Electrochemical Performance of Asphaltene-Based B/N Co-Doped Porous Carbons
摘要
Abstract
B/N co-doped porous carbons have been synthesized by heat treatment at different temperatures using asphaltene from coal liquefaction residue as a carbon precursor, nitric acid as a nitrogen source, H3BO3 as a boron source and a pore-forming agent. The influence of the heat treatment temperature on the pore-structure and surface chemical properties was investigated, and the electrochemical performance in relation to the pore-structure and surface chemical properties was discussed. The crystal structure, morphology, pore-structure, composition and electrochemical performance were examined using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, element analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS), and an electrochemical workstation. The results of these analyses indicated that the crystal structure, pore-structure and surface properties were influenced significantly by the heat treatment process. Increases in the heat treatment temperature led to improvements in the degree of graphitization, as wel as gradual increases in the boron content. In contrast, the nitrogen content decreased and the specific surface area and total pore volume increases gradual y and then decline. The electrochemical performance was found to be dependent on the pore-structure and suitable surface chemical properties. The sample synthesized at 900 °C had a specific surface area of 1103 m2∙g-1, pore volume of 0.921 cm3∙g-1, nitrogen content of 5.256%(w), boron content of 1.703%(w), and a maximal specific capacitance of 349 F∙g-1 at 100 mA∙g-1 in 6 mol∙L-1 aqueous solution of KOH. The sample subjected to a heat treatment at 1000 °C had the best rate capability, with a capacity retention of 75%when the current density increased from 100 mA∙g-1 to 10 A∙g-1.关键词
煤液化沥青质/硼氮共掺杂多孔炭/制备/热处理温度/电化学性能Key words
Asphaltene from coal liquefaction residue/B/N co-doped porous carbon/Preparation/Heat treatment temperature/Electrochemical performance分类
化学化工引用本文复制引用
周颖,王道龙,肖南,侯雨辰,邱介山..热处理温度对沥青基硼氮共掺杂多孔炭结构与电化学性能的影响[J].物理化学学报,2014,(6):1127-1133,7.基金项目
The project was supported by the National Natural Science Foundation of China (21276045).国家自然科学基金(21276045)资助项目 （21276045）
