Co_(9)S_(8)纳米片包覆静电纺碳纳米纤维复合材料用于超级电容器研究  

Study on Co_(9)S_(8)nanosheet-coated on electrospun carbon nanofiber for supercapacitor

作　　者：李净珊 徐洋洋 马玉晗 董梦娇 李秉芯 陈昊天 Li Jingshan;Xu Yangyang;Ma Yuhan;Dong Mengjiao;Li Bingxin;Chen Haotian(Research Institute of Textile and Clothing Industries,Zhongyuan University of Technology,Zhengzhou 450007;College of International Education,Zhongyuan University of Technology,Zhengzhou 450007)

机构地区：[1]中原工学院纺织服装产业研究院,郑州450007 [2]中原工学院国际教育学院,郑州450007

出　　处：《化工新型材料》2024年第11期97-104,共8页New Chemical Materials

基　　金：河南省高等学校重点研发项目(23A430008);河南省重点研发与推广专项(科技攻关)指导项目(222102230047);中国纺织工业联合会科技指导项目(2021047);中原工学院青年人才能力基金项目(K2020QN006)。

摘　　要：利用静电纺丝法制备含均苯三甲酸的聚丙烯腈(PAN)纳米纤维,结合水热法和高温焙烧法,在碳纳米纤维上制备了具有纳米片阵列的硫化钴/碳纳米纤维(Co_(9)S_(8)/CNFs)复合材料。采用扫描电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪和电化学测试等手段,对Co_(9)S_(8)/CNFs复合材料的形貌、结构、组成和电化学性能进行表征。结果表明:PAN纳米纤维中的均苯三甲酸不仅为纳米片阵列的有序生长提供更多的结合位点,避免了纳米片的团聚和堆积,同时有利于纳米片阵列的形成和结构稳定性,防止其在高温碳化过程中的结构坍塌;不含均苯三甲酸的纤维上的纳米片易团聚成花,高温焙烧后结构坍塌。硫化钴的高赝电容、碳纳米纤维的高导电性和独特的纳米片阵列结构,使Co_(9)S_(8)/CNFs复合材料具有良好的电化学性能。Co_(9)S_(8)/CNFs作为电极材料在电流密度1A/g条件下的比电容为481.6F/g,大于不含均苯三甲酸的电极材料(277.5F/g),在电流密度10A/g条件下连续充放电循环5000次,比电容保留率为97.3%。以Co_(9)S_(8)/CNFs为正极,活性炭(AC)为负极组装的非对称超级电容器Co_(9)S_(8)/CNFs//AC在电流密度1A/g条件下比电容为108.9F/g,功率密度为756.8W/kg,能量密度可达34.1Wh/kg。Polyacrylonitrile(PAN)nanofibers containing trimesic acid were fabricated by electrostatic spinning,and Co_(9)S_(8)nanosheet-coated electrospun carbon nanofiber materials(Co_(9)S_(8)/CNFs)were obtained through a combination of hydrothermal and high-temperature annealing process.The morphology,structure,composition and electrochemical properties of Co_(9)S_(8)/CNFs composite materials were characterized by SEM,XRD,FT-IR and electrochemical measurements.The results showed that the trimesic acid in PAN nanofibers not only provided more binding sites for the ordered growth of nanosheet arrays,avoiding the aggregation and stacking of nanosheets,but also facilitated the formation and structural stability of nanosheet arrays,preventing their structural collapse during high-temperature carbonization process.The nanosheets on fibers without trimesic acid tended to agglomerate into flowers and structure collapsed after high-temperature calcination.Due to the high pseudocapacitance of cobalt sulfide,the excellent conductivity of carbon nanofibers and the unique nanosheet structure,the Co_(9)S_(8)/CNFs composite materials demonstrated superior electrochemical properties.The electrochemical measurements indicated that Co_(9)S_(8)/CNFs electrode had a specific capacitance of 481.6F/g at 1A/g,which was higher than that of the electrode material without trimesic acid(277.5F/g),and the capacitance retention was 97.3%after 5000 charge-discharge cycles at 10A/g.An asymmetric supercapacitor Co_(9)S_(8)/CNFs//AC assembled using Co_(9)S_(8)/CNFs as the positive electrode and activated carbon(AC)as the negative electrode had a specific capacitance of 108.9F/g,a power density of 756.8W/kg and an energy density of up to 34.1Wh/kg at a current density of 1A/g.

关 键 词：静电纺丝 碳纳米纤维 硫化钴 纳米片 超级电容器 

分 类 号：TM53[电气工程—电器] O646[理学—物理化学]