摘要
通过水热法、火焰辅助微波法等控制氧化石墨烯(GO)的还原度,制备了一系列具有不同还原度的还原氧化石墨烯(RGO),并以这些RGO为前驱体,以六水氯化镍(NiCl_(2)·6H_(2)O)、2-巯基丙酸(C_(3)H_6O_(2)S)为镍源和硫源,通过水热法合成了系列硫化镍/RGO(NS/RGO)复合材料。通过粉末X射线衍射(XRD)、场发射扫描电子显微镜(FE-SEM)和电化学工作站对材料的晶型结构、形貌特征及电化学储能性能进行了研究。结果表明:RGO的还原度高低不仅显著地影响了NS的晶型结构,而且改变了NS的形貌特征;利用超过140℃水热还原获得的RGO制得的NS/RGO复合材料中NS晶型以Ni_(3)S_(4)主,且形貌由棒状变成了球状;尤其,利用140℃还原获得的RGO制备的NS/RGO具有最强的电化学储能能力,比电容高达3331.6F/g。可为下一代新型电极活性材料的设计和构筑提供新思路。
In this study,the reduction degree of graphene oxide(GO)was controlled by hydrothermal method and flame-assisted microwave method to prepare a series of reduced graphene oxide(RGO)with different reduction degrees.Further,with these RGOs as precursors,nickel chloride hexahydrate(NiCl_(2)·6H 2O)and 2-mercaptopropionic acid(C_(3)H 6O_(2)S)as nickel and sulfur sources,a series of nickel sulfide/RGO(NS/RGO)composites were synthesized by the hydrothermal method.Powder X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM)and electrochemical workstation were used to study the crystal structure,morphology and electrochemical energy storage properties of the as-prepared materials.The results showed that the reduction degree of RGO not only significantly affected the crystal structure of NS,but also changed the morphological characteristics of NS.In the NS/RGO composite prepared from RGO obtained by hydrothermal reduction at over 140℃,the crystal forms of NS were dominated by Ni 3S 4,and the morphology changed from rod-like to spherical.In particular,the NS/RGO composite prepared from RGO obtained by reduction at 140℃had the strongest electrochemical energy storage capacity,and the specific capacitance was as high as 3331.6F/g.Therefore,this study provided new insights for the design and construction of the next-generation electrode active materials.
作者
邹雪锋
徐林坤
冯塑尧
张浩
龙澄杰
沈虎峻
Zou Xuefeng;Xu Linkun;Feng Suyao;Zhang Hao;Long Chengjie;Shen Hujun(Guizhou Provincial Key Laboratory of Computational Nano-Material Science,Guizhou Education University,Guiyang 550018;School of Chemistry and Materials Science,Guizhou Education University,Guiyang 550018)
出处
《化工新型材料》
CAS
CSCD
北大核心
2023年第12期118-123,132,共7页
New Chemical Materials
基金
贵州省科技计划项目(黔科合基础-ZK[2021]一般057)
贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2021]252)
贵州师范学院国家自然基金项目奖励补助资金项目(纵20210108)。
关键词
还原氧化石墨烯
硫化镍
水热法
电化学储能
reduced graphene oxide
nickel sulfides
hydrothermal method
electrochemical energy storage
