Battery anode
Electrochemical power sources are devices through which electric energy can be produced by means of electrochemical reactions. Alkaline electrochemical cells such as metal-air batteries produce electricity by electrochemically coupling in a cell a reactive metallic anode to an air cathode through a suitable electrolyte. Generally, a battery contains a negative electrode, typically called the anode, and a positive electrode, typically called the cathode. The anode contains an active material (e.g., zinc particles) that can be oxidized; and the cathode contains an active material (e.g., manganese dioxide) that can be reduced. The anode active material is capable of reducing the cathode active material. Metal air cells generally include an anode, a cathode, a separator to electrically isolate the anode and the cathode, and an electrolyte to conduct ions between the anode fuel material and the cathode. The cathode generally comprises an air diffusion electrode having a catalyzed layer for reducing oxygen. A capacitor is a device used in electronic circuits to store electrical charge. The capacitance of a device is determined by dividing the charge stored on the plates by the voltage the charge creates across the plates. By increasing the capacitance, a greater charge can be stored per unit volt. In an electrolytic capacitor, capacitance is achieved on the anode (+) plate by electrolytically forming a thin layer of dielectric oxide on the surface and immersing it in an electrolyte solution which functions as the negative (-) plate. An electrolytic capacitor comprises a metal acting as an anode and a dielectric oxide film formed on a surface thereof by anodic oxidation. The dielectric oxide film is brought into contact with an electrolytic solution or a solid electrolyte acting as an opposite electrode to accumulate electric charges between the anode and the opposite electrode.
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