Fundamentals of electrochemistry
2005; Elsevier BV; Linguagem: Inglês
10.1533/9781845690878.1.1
Autores Tópico(s)Analytical Chemistry and Sensors
ResumoA system of two electrodes connected to each other with an external circuit providing an electrical current and immersed in an electrolyte solution allows the conversion of chemical energy into electrical energy and vice versa. Conversion of chemical energy into electrical energy is found in batteries, fuel cells, and corrosion reactions, while the conversion of electrical energy to chemical energy is obtained in electroanalysis, electrolysis, and electroplating. Electrochemical methods are useful for the determination of chemical parameters, such as the concentration of analytes, through measurement of electrical parameters (current, potential, resistance, impedance) of an electrochemical cell. An electrochemical reaction can be defined as a chemical reaction involving charge transfer through an interface. The most commonly known form of charge transfer is the transfer of electrons over a solid electrode–liquid electrolyte interface. In the simplest form, electrons can be transferred from the electrode to a chemical substance in solution (reduction), or electrons that were released from the chemical substance by oxidation can be taken up by the electrode.
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