Preparation and electrochemical properties of La-doped NiCo LDH composites
Layered bimetallic hydroxide is an excellent electrode material for supercapacitors.La-doping can theoretically optimize the properties of such materials.However,its specific effects have not yet been revealed.Therefore,La3+doped nickel-cobalt bimetallic hydroxide(La-NiCo LDH)was prepared by hydrothermal method.On this basis,the effects of La3+doping amount on the microstruc-ture and electrochemical properties of La-Nico LDH were studied by XRD,XPS,SEM and electrochemical tests.The introduction of La3+transforms the morphology of the sample from honeycomb microspheres to petal microspheres,and the specific capacitance of the material is greatly improved.At the current density of 1 A/g,the specific capacitance of the Ni-Co LDH material is 812 F/g.After do-ping with La3+,the specific capacitance of the Ni-Co LDH material is 812 F/g.The specific capacitance of the sample increases to 1 458 F/g.Meanwhile,the electrical conductivity of the material is also improved.
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