Pretražite po imenu i prezimenu autora, mentora, urednika, prevoditelja

Napredna pretraga

Pregled bibliografske jedinice broj: 660525

Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode


Magdić, Katja; Kvastek, Krešimir; Horvat-Radošević, Višnja
Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode // Electrochimica acta, 117 (2014), 310-321 doi:10.1016/j.electacta.2013.11.065 (međunarodna recenzija, članak, znanstveni)


CROSBI ID: 660525 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode

Autori
Magdić, Katja ; Kvastek, Krešimir ; Horvat-Radošević, Višnja

Izvornik
Electrochimica acta (0013-4686) 117 (2014); 310-321

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
glass-like carbon; electrochemical activation; spatial surface heterogeneity; electrochemical impedance spectroscopy; impedance modelling

Sažetak
For the first time, the concept of spatial surface heterogeneity has been implemented to the impedance modelling of unmodified, i.e. only polished and progressively electrochemically oxidized/reduced, i.e. activated glass-like carbon, GC, electrodes. The GC electrode surface is generally treated as spatially heterogeneous in a sense of exhibiting at least two different domains with different electrochemical properties. Consequently, the overall electrode impedance is formally divided into the parallel sum of two global impedances, characteristic for two types of the surface and related by corresponding fractional surface coverage. Assuming the common electrolyte resistance term and indirect influence of surface coverage on impedance parameter values, the impedance/frequency equations are derived for a spatially heterogeneous electrode surface showing: 1) surface roughness due to formation of separate damage sites of surface and subsurface layers with high content of oxygen containing species and 2) partial surface porosity due to formation/reduction of oxide films at damage sites which by progressive oxidation have progressively been spread laterally and towards the bulk of the electrode. Regression of derived impedance/frequency equations to experimentally measured impedance spectra of GC electrodes in H2SO4 solution showed predominance of almost smooth, spatially homogeneous surface for unmodified, GC electrode, via increased contributions of rough and/or porous parts for weakly to medium activated GC electrodes and domination of completely porous surface for strongly activated GC electrode.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekti:
098-0982904-2905 - Elektroaktivni filmovi za ekološki prihvatljivu konverziju i pohranu energije (Horvat-Radošević, Višnja, MZOS ) ( POIROT)
125-1252973-2576 - Temeljna i primijenjena istraživanja vodljivih polimera (Mandić, Zoran, MZOS ) ( POIROT)

Ustanove:
Institut "Ruđer Bošković", Zagreb,
Fakultet kemijskog inženjerstva i tehnologije, Zagreb

Poveznice na cjeloviti tekst rada:

doi www.sciencedirect.com

Citiraj ovu publikaciju:

Magdić, Katja; Kvastek, Krešimir; Horvat-Radošević, Višnja
Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode // Electrochimica acta, 117 (2014), 310-321 doi:10.1016/j.electacta.2013.11.065 (međunarodna recenzija, članak, znanstveni)
Magdić, K., Kvastek, K. & Horvat-Radošević, V. (2014) Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode. Electrochimica acta, 117, 310-321 doi:10.1016/j.electacta.2013.11.065.
@article{article, author = {Magdi\'{c}, Katja and Kvastek, Kre\v{s}imir and Horvat-Rado\v{s}evi\'{c}, Vi\v{s}nja}, year = {2014}, pages = {310-321}, DOI = {10.1016/j.electacta.2013.11.065}, keywords = {glass-like carbon, electrochemical activation, spatial surface heterogeneity, electrochemical impedance spectroscopy, impedance modelling}, journal = {Electrochimica acta}, doi = {10.1016/j.electacta.2013.11.065}, volume = {117}, issn = {0013-4686}, title = {Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode}, keyword = {glass-like carbon, electrochemical activation, spatial surface heterogeneity, electrochemical impedance spectroscopy, impedance modelling} }
@article{article, author = {Magdi\'{c}, Katja and Kvastek, Kre\v{s}imir and Horvat-Rado\v{s}evi\'{c}, Vi\v{s}nja}, year = {2014}, pages = {310-321}, DOI = {10.1016/j.electacta.2013.11.065}, keywords = {glass-like carbon, electrochemical activation, spatial surface heterogeneity, electrochemical impedance spectroscopy, impedance modelling}, journal = {Electrochimica acta}, doi = {10.1016/j.electacta.2013.11.065}, volume = {117}, issn = {0013-4686}, title = {Concept of spatial surface heterogeneity in impedance modelling of electrochemically activated glass-like carbon electrode}, keyword = {glass-like carbon, electrochemical activation, spatial surface heterogeneity, electrochemical impedance spectroscopy, impedance modelling} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Citati:





    Contrast
    Increase Font
    Decrease Font
    Dyslexic Font