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a sensing part of electrode, a bulb made from a specific glass; internal electrode, usually silver chloride electrode or Saturated calomel; internal solution, usually 1.10-7 mol/L HCl for pH electrodes or 0.1 mol/L MeCl for pMe electrodes; when using the silver chloride electrode, a small amount of AgCl can precipitate inside the glass electrode
The pH electrode is an example of a glass electrode that is sensitive to hydrogen ions. Glass electrodes play an important part in the instrumentation for chemical analysis, and physicochemical studies. The voltage of the glass electrode, relative to some reference value, is sensitive to changes in the activity of a certain type of ions.
The article on the glass electrode has a good description and figure. The design of the electrodes is the key part: These are rod-like structures usually made of glass, with a bulb containing the sensor at the bottom. The glass electrode for measuring the pH has a glass bulb specifically designed to be selective to hydrogen-ion concentration.
Pourbaix diagram of iron. [1] The Y axis corresponds to voltage potential. In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, E H –pH diagram or a pE/pH diagram, is a plot of possible thermodynamically stable phases (i.e., at chemical equilibrium) of an aqueous electrochemical system.
In aquatic environments, platinum is often used due to its high electron transfer kinetics, [5] although an electrode made from several metals can be used in order to enhance the electron transfer kinetics. [6] The most common potentiometric electrode is by far the glass-membrane electrode used in a pH meter.
The battery was invented by John B. Goodenough, inventor of the lithium cobalt oxide and lithium iron phosphate electrode materials used in the lithium-ion battery (Li-ion), and Maria H. Braga, an associate professor at the University of Porto [5] and a senior research fellow at Cockrell School of Engineering at The University of Texas.