Contribution of an Electro-Vortex Flow to Primary, Secondary, and Tertiary Electric Current Distribution in an Electrolyte

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F18%3APU136972" target="_blank" >RIV/00216305:26210/18:PU136972 - isvavai.cz</a>

Výsledek na webu

<a href="http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=14&SID=D1mYtjVweLYpwOM65oz&page=1&doc=1" target="_blank" >http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=14&SID=D1mYtjVweLYpwOM65oz&page=1&doc=1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1149/2.1201811jes" target="_blank" >10.1149/2.1201811jes</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Contribution of an Electro-Vortex Flow to Primary, Secondary, and Tertiary Electric Current Distribution in an Electrolyte

Popis výsledku v původním jazyce

Three different approaches, known as primary, secondary, and tertiary current distributions, are employed to calculate the electric current distribution throughout an electrochemical system. Ohm's law is used for the primary and secondary, whereas Nernst-Planck equations for the tertiary. The electromagnetic field is calculated in the entire system (CaF2-based electrolyte, air, electrode, and graphite crucible), while the electro-vortex flow and concentration fields of ions are solved only in the electrolyte. The model accounts for the faradaic reaction of the formation of Fe2+ at the anode and the discharge of Fe2+ and Ca2+ at the cathodic crucible. The electric double layer (EDL) is modeled considering the generalized Frumkin-Butler-Volmer (gFBV) formula. The dissimilarity in the calculated concentration of Fe2+ between secondary and tertiary current distributions decreases with the increase of the applied voltage. A strong stirring of the electrolyte by (exclusive) Lorentz force cannot guarantee uniform concentration for all ions. As the applied voltage increases the migration may locally surpass the advection flux, leading to accumulation of ions near the anode/cathode. All current distributions (primary, secondary and tertiary) predict equal bulk electrical resistance in the absence of diffusive electric current, equal diffusion coefficients for all ions, despite the non-uniform distribution of electrical conductivity in the tertiary current distribution. The modeling results enabled us to elucidate the origin of an experimentally observed phenomenon, i.e., the formation of a thick layer of FeO under the tip of electrode. (C) 2018 The Electrochemical Society.

Název v anglickém jazyce

Contribution of an Electro-Vortex Flow to Primary, Secondary, and Tertiary Electric Current Distribution in an Electrolyte

Popis výsledku anglicky

Three different approaches, known as primary, secondary, and tertiary current distributions, are employed to calculate the electric current distribution throughout an electrochemical system. Ohm's law is used for the primary and secondary, whereas Nernst-Planck equations for the tertiary. The electromagnetic field is calculated in the entire system (CaF2-based electrolyte, air, electrode, and graphite crucible), while the electro-vortex flow and concentration fields of ions are solved only in the electrolyte. The model accounts for the faradaic reaction of the formation of Fe2+ at the anode and the discharge of Fe2+ and Ca2+ at the cathodic crucible. The electric double layer (EDL) is modeled considering the generalized Frumkin-Butler-Volmer (gFBV) formula. The dissimilarity in the calculated concentration of Fe2+ between secondary and tertiary current distributions decreases with the increase of the applied voltage. A strong stirring of the electrolyte by (exclusive) Lorentz force cannot guarantee uniform concentration for all ions. As the applied voltage increases the migration may locally surpass the advection flux, leading to accumulation of ions near the anode/cathode. All current distributions (primary, secondary and tertiary) predict equal bulk electrical resistance in the absence of diffusive electric current, equal diffusion coefficients for all ions, despite the non-uniform distribution of electrical conductivity in the tertiary current distribution. The modeling results enabled us to elucidate the origin of an experimentally observed phenomenon, i.e., the formation of a thick layer of FeO under the tip of electrode. (C) 2018 The Electrochemical Society.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF THE ELECTROCHEMICAL SOCIETY

ISSN

0013-4651

e-ISSN

1945-7111

Svazek periodika

165

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

„E604“-„E615“

Kód UT WoS článku

000444098600002

EID výsledku v databázi Scopus

2-s2.0-85059958689