Boron-doped Nickel-Cobalt Metal Oxide Supercapacitors On Capacitive Electrode Materials And Their Properties

Supercapacitor is a new type of energy storage device.Electrode material is the core component of supercapacitor.Due to its high specific capacitance,low cost and easy preparation,transition metal oxides such as Co and Ni have become the research hotspot of electrode materials for supercapacitors in recent years.This Dissertation adopts the method of electroless plating on thin copper plating substrate Ni-B,the Co-B plating,respectively.using potentiostatic electrochemical oxidation to form B doped NiO,Co₃O₄ constraint capacitor electrode material,XRD,XPS,SEM/TEM modern analytical means such as the material structure,morphology and so on were characterized,and the electrochemical method is used for the preparation of electrode materials including cyclic voltammetry and constant current charge and discharge technology to charge and discharge capacity and cycle performance test,respectively.the main results were as follows:?1?Ni and NiB films were successfully prepared on copper sheet by electroless plating method,and the best process conditions were explored by oxidation of Ni and NiB films under two oxidation systems,respectively.According to XPS and SEM/TEM analysis,the doping amount of B can reach 14.6%.After doping B elements,the surface morphology changes from a porous structure to a uniform particle structure,which leads to the reduction of the reaction resistance.Through the REDOX peak analysis of the cyclic voltammetry curve,the two materials have good electrochemical activity and reversibility.According to the charge-discharge test and the analysis of ac impedance test,the discharge time and capacitance of Ni and NiB both decrease with the increase of current density,and the capacitance of NiB is always higher than that of pure Ni.In particular,when the charge and discharge density was 1A/g,after 10,000 charge and discharge cycles,we found that Ni and ni-b increased from the initial 880F/g and 1100F/g to 1410F/g and 1920F/g respectively in the system of oxygen aid?O_a?.The capacitance maintenance rates of Ni and ni-b were160%and 170%respectively.However,Ni and ni-b increased from the original900F/g and 1300F/g to 1380F/g and 1880F/g respectively in the system of oxygen assist agent?O_b?,and the capacitance maintenance rates were 153%and 144%respectively,indicating that the materials we prepared all had high specific capacitance and good cycling performance.It can be seen from the above that the electrochemical performance is improved after the addition of element B,which further proves the feasibility of the addition of element B.?2?Co and CoB films were prepared on copper plates by electroless plating method.Co and CoB films were oxidized under two oxidation systems respectively and the optimum technological conditions were explored,respectively.When in the oxygen assist agent?O_a?system;In the solution of 1g oxygen aid and 4molKOH,the voltage of Co film is 1.3v,the oxidation temperature is 60?,and the specific capacitance reaches 790F/g at the time of 30min.In the solution of 1g oxygen aid and4molKOH,the voltage of CoB film was 1.1v,the oxidation temperature was 40?,and the specific capacitance reached 2670F/g at the time of 30min.When in a system of oxygen AIDS?O_b?;In the solution of 2g oxygen aid and 1molKOH,the voltage of Co film is 1.0v,the temperature is 60?,and the specific capacitance reaches 710F/g at the time of 60min.In the solution of 1g oxygen aid and 1molKOH,the voltage of CoB film is 1.1v,the oxidation temperature is 60?,and the specific capacitance reaches 2820F/g at the time of 30min.