Question

What's an electrode?
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An electrode is a electrical conductor through which electric current can flow into or out of, typically in the context of a reaction that involves electrons or ions. In chemistry, an electrode may serve as a surface for a chemical reaction, as a potentiometer element, or as part of a solid-state microelectronic device. Electrodes are used in a variety of analytical techniques, including electrochemical analysis methods such as voltammetry, potentiometry, and amperometry.