摘要
以天然矿物纤水镁石为模板、蔗糖为碳源制备多孔碳纳米管,并以硫脲为氮、硫源,采用水热法制备氮/硫共掺杂的碳纳米管。结果表明,掺杂碳纳米管继承了纤水镁石模板的柱状结构,呈现中空管状,增大了模板炭的比表面积和孔容。在6 mol·L^(-1) KOH电解液中,电流密度为1 A·g^(-1)时,未掺杂碳纳米管的比电容为62.2 F·g^(-1),氮掺杂之后碳纳米管的比电容为97.0 F·g^(-1),氮/硫共掺杂的碳纳米管比电容为172.0 F·g^(-1),氮/硫共掺杂后碳纳米管的电化学性能比未掺杂的提高近3倍;循环1000次电容保持率达89%,说明掺/硫共掺杂碳纳米管具有良好的电化学性能。此外,组装的对称型超级电容器同样展示了良好的电容性能。
N/S doped carbon nanotubes were prepared with natural mineral fibrous brucite as template,sucrose as carbon source,and thiourea as nitrogen and sulfur source.Experimental results indicate that the doped carbon nanotubes inherit the one-dimensional columnar structure of the fibrous brucite template.In addition,it presents a hollow tubular structure,which increases the specific surface area and pore volume of the template carbon.In6 mol·L^(-1) KOH electrolyte,the electrochemical performance significantly improves after doping.CNT-N/S presents a high specific capacity of 172.0 F·g^(-1) at current density of 1 A·g^(-1),higher than those of CNT(62.2 F·g^(-1))and CNT-N(97.0 F·g^(-1)).The capacitance of the N/S doped carbon nanotubes remains 89%after 1000 charge-discharge cycles.Furthermore,the assembled symmetrical supercapacitor also shows good capacitance performance.
作者
刘芳芳
传秀云
杨扬
李爱军
LIU Fangfang;CHUAN Xiuyun;YANG Yang;LI Aijun(The Key Laboratory of Orogenic Belts and Crustal Evolution(MOE),School of Earth and Space Sciences,Peking University,Beijing 100871,China;Golden Feature Science and Technology Ltd,Beijing 100095,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第7期711-717,I0001-I0003,共10页
Journal of Inorganic Materials
基金
国家自然科学基金重点项目(51774016,52074015)
北京大学开放测试基金(0000012321)
北京大学翁洪武科研原创基金(WHW201803)。
