Origem do elemento de fase constante em interfaces de eletrodos e soluções líquidas

Abstract

Ever since the characterization of systems with solid-solid or solid-liquid interfaces became a focal point of study for material scientists, mostly for the transition of the usage from aqueous and corrosive solutions to solid-state technology, mathematical models that appropriately described the electrical properties of these interfaces were postulated. One of these models was the constant phase element (CPE), that describes the impedance behavior of the system when subject to an alternating current with variable frequency. Although the CPE indeed appropriately describes some systems, its phenomenological origins is still an open debate among the scientific community. This work intends to detail the properties and implications of the CPE, along with presenting the possible origins of this impedance behavior.