片层状Ni-MOF的制备及其电化学性能研究
Preparation and Electrochemical Performance of Sheet Structure Ni-MOF
孙曼 1姜孟芳 1柴浚淇 1鲁蝶 1翟璐璐 1郭畋锋 1程玉雪 1苏畅1
作者信息
- 1. 沈阳化工大学化学工程学院,辽宁沈阳 110142
- 折叠
摘要
以六水合氯化镍为金属源,对苯二甲酸为配体,采用水热法制备Ni-MOF.利用扫描电子显微镜、傅里叶红外光谱仪、综合热重分析仪和X射线衍射仪对材料的表面形貌和晶体内部结构进行表征,并通过三电极测试对材料的电化学性能进行测试.表面形貌分析测试结果显示:通过水热法制备的Ni-MOF材料呈现出纳米片层状堆叠形貌,其特有的片层状结构对材料的电化学性能产生积极的影响,不仅暴露了更多的活性位点,而且促进了电解液离子在电化学反应过程中的扩散作用.电化学测试结果表明:3 mol/L KOH电解液中,在0.25 A/g的电流密度下,Ni-MOF材料比电容达905 F/g;在10 A/g下,其比电容仍能保持在580 F/g.材料的反应动力学分析结果表明Ni-MOF的氧化还原过程属于典型的由扩散过程控制的电荷存储机制.这些良好的性能都说明金属有机框架作为电极材料在储能领域有较好的应用前景.
Abstract
Ni-MOF was synthesisied with NiCl2·6H2O and PTA through a facile hydrothermal meth-od.The surface morphology and internal crystal structure of Ni-MOF was characterized by Fourier trans-form infrared spectroscopy(FT-IR),X-ray diffraction,thermo gravimetric-differential thermal analy-sis(TG-DTA)and scanning electron microscopy(SEM).The electrochemical property was tested in the three-electrode system.The surface morphology analysis test results show that the Ni MOF material pre-pared by hydrothermal method exhibits a nano layered stacking morphology,and its unique layered struc-ture has a positive impact on the electrochemical performance of the material,not only exposing more ac-tive sites,but also promoting the diffusion of electrolyte ions in the electrochemical reaction process.The electrochemical test shows that the specific capacitance of Ni-MOF in 3 mol/L KOH electrolyte reaches 905 F/g at the current density of 0.25 A/g.At 10 A/g,the specific capacitance is still maintained at 580 F/g.The results of kinetic analysis show that the REDOX process of Ni-MOF is a typical charge storage mechanism controlled by diffusion process.These good properties indicate that the metal-organic frame-work as electrode materials has a good application prospect in the field of energy storage.
关键词
金属有机框架/纳米片层/超级电容器/电化学Key words
metal organic frameworks/nano-sheet/supercapacitor/electrochemical引用本文复制引用
出版年
2024
NETL
NSTL
万方数据