多孔Co_3O_4纳米纤维的合成及电化学性能研究  

Synthesis and properties of porous Co_3O_4 nanofiber

作　　者：李翠艳[1] 弓琴琴 王兴[1] 张志成[1] 刘起[1] 王帅[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2016年第6期71-75,共5页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51302160);陕西科技大学博士科研启动基金项目(BJ14-15);大学生创新创业训练计划项目(201510708149)

摘　　要：采用微波水热法合成碱式碳酸钴纳米纤维,低温煅烧后得到多孔结构的Co_3O_4纳米纤维.利用XRD、SEM和TEM对热处理前后产物的物相和微观结构进行了研究;使用BET对煅烧前后样品的孔径分布及孔隙率进行了测试.结果表明:所制备的Co_3O_4纳米纤维为立方相,其直径为40~70nm、长度为2~4μm.纳米纤维由尺寸为20nm左右的颗粒聚集而形成多孔结构.多孔Co_3O_4纳米纤维的比表面积为61.89m^2·g^(-1).多孔Co_3O_4纳米纤维具有较高的比容量,在电流密度为100、200、500、800、1 000、2 000mA·g^(-1)时,其可逆容量分别为856、763、695、598、502、382 mAh·g^(-1).当电流返回100 mA·g^(-1)时,容量可再次达到850mAh·g^(-1)左右,表明多孔Co_3O_4纳米纤维具有较高的倍率容量和良好的循环可逆性.Porous Co_3O_4 nanofibers were synthesized by a microwave hydrothermal combining thermal treatment.The phase and microstructure of the Co_3O_4 nanofibers were analyzed by XRD、SEM and TEM.The specific surface area and pore size distribution of the Co_3O_4 nanofibers were obtained from BET nitrogen adsorption isotherm measurement.Results show that the Co_3O_4 nanofibers were 40~70nm in diameter and 2~4μm in length.which were constructed by nano particles with a size of 20 nm.The specific surface area of the Co_3O_4 nanofibers was about 61.89 m^2·g^（-1）.The Co_3O_4 nanofibers exhibit high specific capacity.The reversible capacity present 856,763,695,598,502,382mAh·g^（-1） when the charge current density is 100,200,500,800,1 000,2 000 mA·g^（-1）,respectively.When current density decrease to 100mA·g^（-1）,the reversible capacity is about 850mAh·g^（-1）.It is indicated that Co_3O_4 nanofibers has high rate capacity and good cyclic reversibility.

关 键 词：四氧化三钴 微波水热 多孔纳米纤维 比容量 

分 类 号：O646[理学—物理化学]