Physical and mathematical models of an inert macroelectrode modified with active hemispherical microelectrodes
Само за регистроване кориснике
2007
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
The physical model of an inert electrode partially activated with hemispherical microelectrodes was formed by the deposition of silver grains on a graphite substrate. It is shown that the process on the microelectrodes can be under activation control despite the fact that the overall rate is determined by the diffusion layer of the macroelectrode. On the basis of this conclusion a mathematical model of mass transfer on an inert electrode partially covered with active hemispherical particles (microclectrodes) is given and verified qualitatively by appropriate experiments. It was found that the degree of activation does not depend on the size of the particles, but on the ratio of the radius of the particles to the interparticle distance. This means that the quantity of catalyst required for the transformation of an inert electrode into an active one decreases strongly with decreasing active particle size. It was also shown that the maximum current density to the activated inert electrode... was equal to the limiting diffusion one to the massive active electrode, as well as that the activity of the modified inert electrode at the same coverage of catalyst strongly depends on the exchange current density of the electrochemical process taking place on it. The larger is the exchange current density, the lower is the quantity of catalyst required for the same effect on the activity of the modified electrode.
Кључне речи:
active microelectrodes / activated inert substrate / partially covered inert electrode / partially active electrodeИзвор:
Electrochimica Acta, 2007, 52, 14, 4696-4707Издавач:
- Pergamon-Elsevier Science Ltd, Oxford
Финансирање / пројекти:
- Модификација металних и неметалних материјала електропроводним полимерима за примену у новим технологијама (RS-MESTD-MPN2006-2010-142044)
DOI: 10.1016/j.electacta.2007.01.005
ISSN: 0013-4686
WoS: 000246021400013
Scopus: 2-s2.0-33947226758
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Popov, Konstantin I. AU - Živković, Predrag M. AU - Grgur, Branimir PY - 2007 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1075 AB - The physical model of an inert electrode partially activated with hemispherical microelectrodes was formed by the deposition of silver grains on a graphite substrate. It is shown that the process on the microelectrodes can be under activation control despite the fact that the overall rate is determined by the diffusion layer of the macroelectrode. On the basis of this conclusion a mathematical model of mass transfer on an inert electrode partially covered with active hemispherical particles (microclectrodes) is given and verified qualitatively by appropriate experiments. It was found that the degree of activation does not depend on the size of the particles, but on the ratio of the radius of the particles to the interparticle distance. This means that the quantity of catalyst required for the transformation of an inert electrode into an active one decreases strongly with decreasing active particle size. It was also shown that the maximum current density to the activated inert electrode was equal to the limiting diffusion one to the massive active electrode, as well as that the activity of the modified inert electrode at the same coverage of catalyst strongly depends on the exchange current density of the electrochemical process taking place on it. The larger is the exchange current density, the lower is the quantity of catalyst required for the same effect on the activity of the modified electrode. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - Electrochimica Acta T1 - Physical and mathematical models of an inert macroelectrode modified with active hemispherical microelectrodes EP - 4707 IS - 14 SP - 4696 VL - 52 DO - 10.1016/j.electacta.2007.01.005 ER -
@article{ author = "Popov, Konstantin I. and Živković, Predrag M. and Grgur, Branimir", year = "2007", abstract = "The physical model of an inert electrode partially activated with hemispherical microelectrodes was formed by the deposition of silver grains on a graphite substrate. It is shown that the process on the microelectrodes can be under activation control despite the fact that the overall rate is determined by the diffusion layer of the macroelectrode. On the basis of this conclusion a mathematical model of mass transfer on an inert electrode partially covered with active hemispherical particles (microclectrodes) is given and verified qualitatively by appropriate experiments. It was found that the degree of activation does not depend on the size of the particles, but on the ratio of the radius of the particles to the interparticle distance. This means that the quantity of catalyst required for the transformation of an inert electrode into an active one decreases strongly with decreasing active particle size. It was also shown that the maximum current density to the activated inert electrode was equal to the limiting diffusion one to the massive active electrode, as well as that the activity of the modified inert electrode at the same coverage of catalyst strongly depends on the exchange current density of the electrochemical process taking place on it. The larger is the exchange current density, the lower is the quantity of catalyst required for the same effect on the activity of the modified electrode.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "Electrochimica Acta", title = "Physical and mathematical models of an inert macroelectrode modified with active hemispherical microelectrodes", pages = "4707-4696", number = "14", volume = "52", doi = "10.1016/j.electacta.2007.01.005" }
Popov, K. I., Živković, P. M.,& Grgur, B.. (2007). Physical and mathematical models of an inert macroelectrode modified with active hemispherical microelectrodes. in Electrochimica Acta Pergamon-Elsevier Science Ltd, Oxford., 52(14), 4696-4707. https://doi.org/10.1016/j.electacta.2007.01.005
Popov KI, Živković PM, Grgur B. Physical and mathematical models of an inert macroelectrode modified with active hemispherical microelectrodes. in Electrochimica Acta. 2007;52(14):4696-4707. doi:10.1016/j.electacta.2007.01.005 .
Popov, Konstantin I., Živković, Predrag M., Grgur, Branimir, "Physical and mathematical models of an inert macroelectrode modified with active hemispherical microelectrodes" in Electrochimica Acta, 52, no. 14 (2007):4696-4707, https://doi.org/10.1016/j.electacta.2007.01.005 . .