文献类型：期刊文献

中文题名：铁掺杂槟榔衍生炭材料的电化学性能研究

英文题名：High specific capacitance of iron doped betel nut derived carbon materials

作者：牛晓勤[1,2];吴迪尘[3];李燕[2];尉梅梅[3];陈玉红[1]

第一作者：牛晓勤

机构：[1]兰州理工大学石油化工学院,甘肃兰州730050;[2]甘肃中医药大学信息工程学院,甘肃兰州730000;[3]兰州理工大学材料科学与工程学院,甘肃兰州730050

第一机构：兰州理工大学石油化工学院,甘肃兰州730050

年份：2021

卷号：40

期号：9

起止页码：857

中文期刊名：电子元件与材料

外文期刊名：Electronic Components And Materials

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家自然科学基金(52073133,51763014);兰州理工大学红柳杰出青年学者项目。

语种：中文

中文关键词：清洁能源;生物质炭;电极材料;铁掺杂;超级电容器

外文关键词：clean energy;biomass charcoal;electrode materials;iron doping;supercapacitor

摘要：以食用后废弃的槟榔作为前驱体,经由预氧化、氢氧化钾活化和高温炭化制备生物质炭。将炭材料置于六水合氯化铁溶液中吸附铁离子,经由一步热处理后最终制备铁掺杂炭材料。通过比表面积测试(BET)研究活化前后比表面积和孔径分布的变化发现:经过氢氧化钾的活化,炭材料表面出现大量孔结构,其比表面积和孔隙率均有显著的提高;通过X射线光电子能谱(XPS)研究铁元素的掺杂形式发现:铁元素主要以Fe^(3+)的形式存在,并且由于铁元素的成功引入有效地降低了电荷转移阻抗,使得进行双电层储能的活性位点增多,从而提高了电化学性能。通过循环伏安、恒流充放电和电化学阻抗谱对电极材料的电化学性能进行测试得到如下结果:经过氢氧化钾活化的炭材料在6 mol/L氢氧化钾溶液中比电容为299.8 F/g(电流密度为1 A/g),而经由铁掺杂改性的炭材料在同样的测试条件下比电容进一步提高到351.6 F/g。
In this study,betel nut was used as the precursor to prepare biochar by preoxidation,potassium hydroxide activation,and high temperature carbonization.The carbon materials were put into ferric chloride hexahydrate solution to absorb iron ions,and then the iron doped carbon materials were prepared by one-step heat-treatment.The specific surface area and pore size distribution before and after activation were studied by BET.The results showed that a large number of pore structures appeared on the surface of the carbon materials after activation by potassium hydroxide,and the specific surface area and porosity of carbon materials were significantly improved;X-ray photoelectron spectroscopy(XPS)was used to study the doping state of iron.It was found that iron mainly existed in the form of Fe^(3+),and the introduction of iron effectively reduced the charge transfer impedance,increased the number of the active sites for electric double layer energy storage and improved the electrochemical performance.The electrochemical performance of the electrode materials was tested by cyclic voltammetry,constant current charging&discharging and electrochemical impedance spectroscopy.The specific capacitance of the carbon material activated by potassium hydroxide in 6 mol/L potassium hydroxide solution is 299.8 F/g(at current density of 1 A/g),and the specific capacitance of the carbon materials modified by iron doping is further improved to 351.6 F/g under the same test condition.