摘要
以硝酸钴为钴源,六次甲基四胺为沉淀剂,通过水热法在棉花基碳纤维基底上原位生长氢氧化钴。借助扫描电镜、X射线衍射和红外光谱等对材料的形貌和结构进行表征。采用循环伏安、恒电流充放电及交流阻抗等对材料的电化学性能进行研究。X射线衍射和扫描电镜测试结果表明,在碳纤维基底上原位生长的氢氧化钴呈花瓣状、α型。电化学性能测试表明,当电流密度为1 A/g时,所得花瓣状氢氧化钴的比电容为650 F/g;当电流密度增大至10 A/g时,仍保留67%的初始比电容值。以上结果表明,在碳纤维基底上原位生长形成的花瓣状氢氧化钴具有优异的电化学性能,原因在于碳纤维基底原位生长有助于提高氢氧化钴的分散性,形成纳米片状花瓣结构,进而显著改善其储能性能。
The cobalt hydroxides were in situ synthesized via hydrothermal method with carbon fiber derived from cotton as substrate using cobalt nitrate as cobalt precursor and hexamethylenetetramine as precipitation agent. The morphology and structure of the materials were characterized by scanning electron microscope(SEM), X-ray diffraction(XRD) and IR spectra, respectively. The electroch-emical performance of the samples was analyzed by electrochemical tests such as cyclic voltammetry, galvanostatic charge and discharge and AC impedance. The XRD and SEM results show that, the obtained cobalt hydroxide grown in situ on the carbon fiber substrate is flower-like and α-phase. The electrochemical performance tests display that the specific capacitance of the flower-like cobalt hydroxide is 650 F/g at the current density of 1 A/g, and the retention rate of 67% can be kept with the current density of 10 A/g. The above results illustrate that the flower-like cobalt hydroxide has excellent electrochemical performance, mainly due to its unique structure and morphology, which significantly improves the stability of the electrode material, the diffusion rate of ions and the transport efficiency of electrons.
作者
冯艳艳
李彦杰
杨文
钟开应
FENG Yan-yan;LI Yan-jie;YANG Wen;ZHONG Kai-ying(Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,Guangxi,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2020年第3期121-126,共6页
Journal of Materials Engineering
基金
广西自然科学基金(2017GXNSFBA198193,2017GXNSF BA198124)
国家自然科学基金(21606058)
广西中青年教师基础能力提升项目(2017KY0268)
关键词
超级电容器
花瓣状氢氧化钴
碳纤维
六次甲基四胺
supercapacitor
flower-like cobalt hydroxide
carbon fiber
hexamethylenetetramine
