NiCo2O4纳米片的电化学方法制备及其超级电容性能研究.doc

毕业论文 论文题目（中文） NiCo2O4 论文题目（外文Electrochemical synthesis of NiCo2O4_ nanosheets for supercapacitors NiCo2O4纳米片的电化学方法制备及其超级电容性能研究 摘 要 NiCo2O4是一种制备工艺简单的高性能超级电容器电极材料，将其生长在大比表面积的导电基底上更能体现其优秀的电容性能。在本研究中，我们首先采用电化学沉积的方法在三维多孔泡沫镍基底上生长了Ni-Co双氢氧化物，然后通过退火处理得到了片状的NiCo2O4纳米电极材料。我们利用扫描电子显微镜（SEM）X射线衍射（XRD）NiCo2O4纳米片的形貌特征。通过恒流充放电(GCD)和循环伏安法(CV)对NiCo2O4电极材料的电化学性能进行了表征。测试结果表明：当沉积量达到0.24 mg时（窗口电压 -1 V沉积时间5 min）NiCo2O4-5）30 mA cm-2时，具有最高比电容值333.3 F g-1。这表明NiCo2O4纳米片是一种前景可观的超级电容器电极活性物质。 关键词：NiCo2O4纳米片；泡沫镍；电化学沉积；超级电容器 ELECTROCHEMICAL SYNTHESIS OF NiCo2O4 NANAOSHEETS FOR SUPERCAPACITORS Abstract NiCo2O4 is a high-performance electrode material for electrochemical supercapacitors, which can be prepared by facile methods. It is desirable to grow NiCo2O4 on conductive substrate with high surface area material to reflect its excellent capacitive performance. In this study, we firstly prepared Ni-Co hydroxide nanosheets on nickel foam substrates by a facile electrochemical synthesis, and then the hydroxides turned into NiCo2O4 after an annealing process. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the surface morphology of the NiCo2O4 nanosheets. Galvanostatic charge-discharge (GCD) and cyclic voltammetry (CV) measurements were used to evaluate their capacitive performance. The results show that the sample with mass loading of 0.24 mg (-1 V，5 min) (NiCo2O4-5) can demonstrate the best electrochemical performance. At the current density of 30 mA cm-2, the highest specific capacitance of the NiCo2O4-5 is 333.3 F g-1, which indicates that NiCo2O4 is a promising active material for supercapacitors. Key words: NiCo2O4 nanosheets; Nickel foam; Electrochemical deposition; Supercapacitor目 录 摘 要 I Abstract II 第一章 前言 1 1.1研究背景 1 1.2 电容器的原理 2 1.3 超级电容器的电极材料 3 1.4 研究依据及意义 4 第二章 实验 4 2.1 NiCo2O4片的制备 4 2.2 材料表征和电化学性能测试 5 第三章 结果与讨论 6 第四章 结论 11 参考文献 12 致 谢 14 第一章 前言 1.1研究背景 世界经济的现代化得益于化石能源，如石油、天然气、煤炭与核裂变能的广泛投入