Effects of cobalt addition on electrochemical performance of pasted nickel electrodes
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Abstract:
The pasted foam-nickel electrodes were prepared with various amounts of the addition of cobalt metallic powder to nickel hydroxide powder. Constant current charge/discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the electrochemical performances of the pasted nickel electrodes. Results show that in comparison with that of the nickel electrode without cobalt addition, the nickel electrodes with cobalt powder addition exhibit better performances in the specific discharge capacity, active material utilization, resistance to swelling with cycling and cycle stability. Meanwhile, the cobalt addition also lowers the discharge potential of the pasted nickel electrodes, so the amount of cobalt addition to the nickel electrodes should be controlled, and an appropriate amount of addition is 3%~5%(mass percentage). The superior electrochemical performances of the nickel electrodes with the cobalt addition can be attributed to the higher reaction activity and lower electrochemical impedance.Cite
The effect of additives Al2O3 and TiO2 on the charge-discharge behavior of the zinc electrodes were investigated. Scanning electron micrograph (SEM) was employed to study the change in morphology. The Cyclic Voltametry test, zinc self-corrosion test and electrochemical characteristics were established. From the electrochemical investigations, various charge-discharge curves at different experimental conditions were obtained. Results indicated that the zinc electrode added with 17wt.% Al2O3 exhibits about 45 times cycle life, while the zinc electrode added with 25wt.% TiO2 exhibits more than 90 times cycle life.
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Cobalt hydroxide
Deposition
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The active material of secondary alkaline zinc electrode with barium additives was prepared by a chemical reaction method and characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrochemical performance of various pasted Zn electrodes was investigated by cyclic voltammetry, charge/discharge method and electrochemical impedance spectra (EIS) technology. The addition of barium can synthesize a compound barium zincate with the molecular structure of BaZn(OH)_(4)· xH_(2)O and improve the discharge performance. The EIS of the various Zn electrodes showed two time constants besides diffusion impedance, including a state variable representing the covering degree of discharge products on the electrode surface.
Zincate
Barium
Alkaline battery
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Effect of cerium element which was mixed with Ni(OH) 2 by incorporation and co precipitated as additive on properties of nickel electrode were studied. The experimental results were analyzed by means of cyclic voltammetry. The results show that nickel electrodes with incorporated directly display excellent charge discharge behaviour. by contrast nickel electrodes co precipitated with cerium can not effectively improved the properties. The results of cyclic voltammetry shows that the reversibility of nickel electrode with cerium incorporated is improved as well as the transportation ability of H +, thus the properties is better.
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Characterization
Carbon fibers
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The electrochemical behaviors of zinc anode in the presence of the additives added to the electrodes are presented. LaCoO 3 was used as an additive to improve the electrochemical properties of the zinc anode. LaCoO 3 synthesized by sol gel method (Schiff base complex) was added to Zn and ZnO powder with the weight ratios of 1:0.05 and 1:0.002 respectively. The electrochemical properties of the zinc and zinc/LaCoO 3 electrodes in 6M KOH solution were investigated by voltammetric technique and electrochemical impedance spectroscopy (EIS). The cyclic voltammograms showed that zinc electrodes with LaCoO3 additive gave higher anodic currents and ZnO passivation delayed. The cathodic Tafel plot indicated that the hydrogen overpotential shifted toward more negative value. The EIS revealed that the charge transfer resistances of the zinc/LaCoO 3 electrodes were higher than that of zinc electrodes.
Overpotential
Passivation
Galvanic anode
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Overpotential
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Indium tin oxide
Tin oxide
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Alkaline battery
Potassium hydroxide
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