石墨烯对不同形貌钴酸镍结构和电化学性能的影响

发布时间：2018-05-08 13:01

本文选题：钴酸镍 + 沉淀剂　；参考：《材料保护》2017年09期

【摘要】：石墨烯由于其独特的空间结构和异质性,对金属氧化物的空间结构和结晶性具有非常明显的影响。目前关于石墨烯对钴酸镍(NiCo_2O_4)晶体结构和微观形貌影响的研究较少。通过改变沉淀剂体系,并用十二烷基磺酸钠(SDBS)作为表面活性剂分散石墨烯,用水热反应和煅烧法生成了一维和二维结构的NiCo_2O_4晶体和石墨烯的复合材料。利用SEM、TEM、XRD和氮气吸脱附测试对所制得的复合材料进行微观结构和形貌进行表征,采用恒流充放电、循环伏安和交流阻抗法对复合材料的电化学性能进行了研究。结果表明:石墨烯含量的增加会导致NiCo_2O_4的结晶度下降,但会提高晶体材料的比表面积,对孔隙结构的影响非常明显;石墨烯还能进一步改善复合材料的内阻,但是对电容值的贡献随石墨烯含量的增加先上升后下降。
[Abstract]:Because of its unique spatial structure and heterogeneity, graphene has an obvious effect on the spatial structure and crystallinity of metal oxides. There are few studies on the effect of graphene on the crystal structure and microstructure of NiCo2O4). By changing the precipitator system and using sodium dodecyl sulfonate (SDBs) as surfactant to disperse graphene, one and two dimensional NiCo_2O_4 crystal and graphene composites were synthesized by hydrothermal reaction and calcination. The microstructure and morphology of the composites were characterized by SEM Tem XRD and nitrogen adsorption and desorption tests. The electrochemical properties of the composites were studied by constant current charge-discharge cyclic voltammetry and AC impedance method. The results show that the crystallinity of NiCo_2O_4 decreases with the increase of graphene content, but the specific surface area of the crystal material is increased, and the effect of graphene on the pore structure is very obvious, and graphene can further improve the internal resistance of the composites. However, with the increase of graphene content, the contribution to capacitance increased first and then decreased.
【作者单位】：河南工业大学机电工程学院;
【基金】：国家自然科学基金(51373048);国家自然科学基金(U1604253)资助
【分类号】：TB33;TM53

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