Ni~(2+)复合MOF-5材料的制备工艺及其电化学性能研究

金属有机框架材料(Metal organic frameworks,MOFs)由于具有超高的比表面积和可调的孔结构,已成为超级电容器电极材料的研究热点。以硝酸锌(Zn(NO_3)_2·6H_2O)和对苯二甲酸(C_6H_4(COOH)_2,BDC)为原料,采用水热法制备了MOF-5材料,并将MOF-5与不同比例的Ni~(2+)复合制备了Ni-MOF-5复合材料。用扫描电镜(SEM)和X射线衍射分析仪(XRD)对材料的表面形貌和结构进行了表征,采用Princeton和Arbin超级电容器测试系统对材料的电化学性能进行了测试。结果表明:复合不同比例的Ni~(2+)可获得不同形貌的Ni-MOF-5复合材料,当Ni~(2+)∶Zn~(2+)=0.50∶1.00(物质的量比)时,制得形貌均匀的微球富Ni颗粒,且其电化学性能优良,在电流密度为0.05 A/g的条件下,比容量达到400 F/g。

Preparation and electrochemical performance of Ni2+-doped MOF-5 crystals

Metal organic frameworks (MOFs) have become a hot topic in the research of supercapacitor electrode materials because of its high specific surface area and tunable pore structure.MOF-5 crystals were synthesized by hydrothermal method using zinc nitrate (Zn(NO3)2·6H2O) and terephthalic acid (C6H4(COOH)2,BDC) as reactants.The composites of Ni-doped MOF-5 crystals with various additions of Ni ions were obtained.The morphology and microstructure of the as-prepared samples were characterized by scanning electron microscope (SEM) and X-ray diffraction analysis (XRD),and electrochemical properties used as electrode materials for supercapacitors were tested using the Princeton workstation and Arbin systerm.The results show that the composites of Nidoped MOF-5 with different morphologies are obtained with various additions of Ni ions.The composite presents uniform Ni-rich microsphere particles when the ratio of Ni ions and Zn ions is 0.50 ∶ 1.00 (mole ratio),and it has good electrochemical performance with a specific capacitance of 400 F/g at a current density of 0.05 A/g.