Electrochemical and nanogravimetric studies of iron phthalocyanine microparticles immobilized on gold in acidic and neutral media

Nemes, Ákos; Inzelt, György

doi:10.1007/s10008-014-2643-4

Cited by 8 publications

(4 citation statements)

References 59 publications

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“…24,51 By cyclic voltammetry, FePc shows an oxidation peak at +0.252 V (vs. Ag/AgCl) associated to the redox couple Fe(II)Pc(À2)/Fe(III)Pc(À2), and a reduction peak near to +0.250 V, showing a reversible processes. This was also observed by Nemes et al 20 When the Au(111) surface is modified with CoPc it is possible to note an oxidation peak at +0.224 V (vs. Ag/AgCl) associated to the Co(II)Pc(À2)/Co(III)Pc(À2), similar to what was observed for FePc. However, the reduction peak is too weak to be identified.…”

Section: Oxidation Process Of Mpc On Au(111)supporting

confidence: 83%

“…This is mainly because the electrochemical response of the modified electrodes depends not only on the transition metal of the MPc, but also in the presence or absence of substituents in the macrocyclic ring, the solvent used, the type of immobilization used to anchor the MPc to the electrode, and the type of the electrode material. 15,[17][18][19] The modification of electrodes with MPc include the direct adsorption of the MPc, 20,21 electropolymerization 19 and selfassembled monolayer (SAM). 22,23 The main advantage of using the adsorption method as the modeled in the present work is that there is no need to work with substituted MPc for the formation of SAMs or for polymerization.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic aspects of metallophthalocyanines adsorbed on gold-electrode. Theoretical exploration of the binding nature role

Miranda-Rojas

Sierra‐Rosales

Muñoz-Castro

et al. 2016

Phys. Chem. Chem. Phys.

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The need of deeper insights regarding the inner working of catalysts represents a current challenge in the search of new ways to tune their activities towards new chemical transformations. Within this field, metallophthalocyanines-based (MPc) electrocatalysis has gained tremendous attention due to their versatility, low cost, great stability and excellent turn-over properties. In this concern, here we present a quantum chemical study of the formation of supramolecular complexes based on the adsorption of MPcs on gold substrates, and the effect of the substrate on their electrocatalytic properties. For this purpose, we used iron- (FePc), cobalt- (CoPc) and copper-phthalocyanines (CuPc). To model the gold surface we used two gold clusters of different sizes, given by Au and Au accounting for gold electrode Au(111) surface. Thus, both electronic and binding strength features of the adsorption process between the complexes were analyzed in detail in order to gain a deeper description of the nature of the MPc-Au(111) formation, by using Density Functional Theory (DFT) calculations, at the PBE and TPSS levels including the dispersive contribution according to the Grimme approach (D3). Our results show that dispersion forces rule the MPc-gold interaction, with binding strengths ranging between 61 and 153 kcal mol, in agreement to the reported experimental data. To provide a detailed picture of our findings we used the non-covalent interactions index (NCIs) analysis, which offers additional chemical insights regarding the forces that control their interaction strength. Finally, our calculations revealed that among the three MPcs, CuPc required less energy for its oxidation. However, the removal of the electron involves a tremendous decrease of the MPc-gold surface interaction strength thus suggesting its desorption, which would prevent the required reversibility of the redox reaction, explaining its low performance observed experimentally.

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Section: Oxidation Process Of Mpc On Au(111)supporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Catalytic aspects of metallophthalocyanines adsorbed on gold-electrode. Theoretical exploration of the binding nature role

Miranda-Rojas

Sierra‐Rosales

Muñoz-Castro

et al. 2016

Phys. Chem. Chem. Phys.

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“…Although the destination of these electrons present in the ferrite structure is not clear, some possible reactions are the reduction of H 2 O or O 2 which are well known to take place by Fe 2+ present in the oxide structures [33][34][35][36] (Eqs. (6) and (7)):…”

Section: Resultsmentioning

confidence: 99%

Catalytic oxidation of aqueous sulfide in the presence of ferrites (MFe2O4, M=Fe, Cu, Co)

et al. 2016

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“…A polyCuPc esetén is csak a gyűrű redoxi átalakulásaival kell számolnunk [90], azonban a réteg elektromos vezetésére jelentős hatással lehet a polimerizációból adódó kiterjedt delokalizált elektronrendszer. A FePc esetén a központi vasion átalakulása is meghatározó a redoxi állapotok során [91], így ebben az esetben még több vezetési állapotot várhatunk. A mérések értékelése során figyelembe vettük az adott Pc-n mért ciklikus voltammogramot és az EQCN frekvenciaválaszt is, hogy mennél pontosabb leírást adhassunk a folyamatokról.…”

Section: Bevezetésunclassified

Ftalocianinok elektrokémiai és elektrokatalitikus tulajdonságainak vizsgálata

Nemes¹

2017

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KöszönetnyilvánításProf. Dr. Inzelt György témavezetőm már 2009 óta folyamatosan segíti nemcsak kutatásomat, egész pályafutásomat. Nagyon köszönök mindent, amivel az elmúlt években támogatott, a tanácsokat, hogy mindig azt kereste, ami a legjobb lesz nekem. Köszönöm mindazoknak, akikkel együtt dolgozhattam az elmúlt években az Eötvös Loránd Tudományegyetemen. Köszönöm Dr. Kriston Ákosnak és Dr. Berkes Balázs Barnabásnak, hogy már a kezdeti időkben együtt dolgoztunk, köszönöm, hogy segítettek megismerkedni az elektrokémiával és a mérési módszerekkel. Köszönöm a közös munkát Colin E. Moore-nak és Broda Balázsnak. Köszönöm Kasek Szilviának a sok segítséget. Köszönöm a csoport többi tagjának, különösen Prof. Dr. Láng Győzőnek, Dr. Zsélyné Újvári Máriának és Dr. Vesztergom Somának, hogy segítették munkámat. Köszönöm vegyész társaimnak és barátaimnak, akikkel együtt indultunk, hogy végig szoros barátságban maradtunk, és támogattuk egymást. Köszönöm mindazoknak, akik külföldi munkáim során támogattak. Köszönöm Prof. Dr.

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Electrochemical and nanogravimetric studies of iron phthalocyanine microparticles immobilized on gold in acidic and neutral media

Cited by 8 publications

References 59 publications

Catalytic aspects of metallophthalocyanines adsorbed on gold-electrode. Theoretical exploration of the binding nature role

Catalytic aspects of metallophthalocyanines adsorbed on gold-electrode. Theoretical exploration of the binding nature role

Catalytic oxidation of aqueous sulfide in the presence of ferrites (MFe2O4, M=Fe, Cu, Co)

Ftalocianinok elektrokémiai és elektrokatalitikus tulajdonságainak vizsgálata

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