金纳米颗粒掺杂Mo-Ni基双金属氢氧化物电极材料

Gold nanoparticles doped Mo-Ni bimetallic hydroxide electrode material

以硝酸镍与钼酸钠为原材料,经过一步水热法和金纳米颗粒(AuNP)物理沉积法,制备AuNP掺杂的3D孔道结构Mo-Ni基双金属氢氧化物(Mo(OH)6/Ni(OH)2-AuNP)。通过扫描电子显微镜(SEM)观察材料表面形貌前后变化,以及X射线衍射(XRD)仪研究材料晶体结构。Mo(OH)6/Ni(OH)2-AuNP作为电化学活性物质,与活性炭负极材料组装为非对称型超级电容器。采用循环伏安(CV)、恒流充放电(GCD)和电化学阻抗谱(EIS)对其电化学性能进行测试。结果表明,Mo(OH)6/Ni(OH)2-AuNP具有3D孔状的网络结构,并展现出优异的电化学性能。在电流密度为0.5 A·g^-1时比电容高达1696.0 F·g^-1,其组装的非对称器件在0.5 A·g^-1下比电容也可达到120 F·g^-1。

The gold nanoparticle(AuNP)-doped bimetallic hydroxide of Mo(OH)6/Ni(OH)2 with 3D pore network structure was prepared by one-step hydrothermal method and AuNP physical sedimentation method.Scanning electron microscope(SEM)was used to observe the surface morphology of the materials,and X-ray diffraction(XRD)was used to study the crystal structure of the material.The prepared Mo(OH)6/Ni(OH)2-AuNP was used as the active material and assembled with the anode material(activated carbon)to form an asymmetric supercapacitor.Cyclic voltammetry(CV),galvanostatic charging-discharging(GCD)and electrochemical impedance spectroscopy(EIS)were used to test its electrochemical performance.The results show that Mo(OH)6/Ni(OH)2-AuNP has 3D porous network structure.The specific capacitance of Mo(OH)6/Ni(OH)2-AuNP3 is up to 1696.0 F·g^-1 at the current density of 0.5 A·g^-1,and the specific capacitance of the assembled asymmetrical supercapacitor can reach 120 F·g^-1 at 0.5 A·g^-1.