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

Sebastián Miranda-Rojas, Paulina Sierra-Rosales, Alvaro Muñoz-Castro, Ramiro Arratia-Pérez, José Heráclito Zagal, Fernando Mendizábal

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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 Au26 and Au58 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-1, 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.

Original languageEnglish
Pages (from-to)29516-29525
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number42
DOIs
Publication statusPublished - 1 Jan 2016

Fingerprint

Gold
gold
Electrodes
electrodes
Adsorption
Electrocatalysis
adsorption
Redox reactions
Force control
interactions
Substrates
versatility
Cobalt
surface reactions
Density functional theory
Desorption
cobalt
Iron
desorption
density functional theory

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Miranda-Rojas, Sebastián ; Sierra-Rosales, Paulina ; Muñoz-Castro, Alvaro ; Arratia-Pérez, Ramiro ; Zagal, José Heráclito ; Mendizábal, Fernando. / Catalytic aspects of metallophthalocyanines adsorbed on gold-electrode. Theoretical exploration of the binding nature role. In: Physical Chemistry Chemical Physics. 2016 ; Vol. 18, No. 42. pp. 29516-29525.
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Catalytic aspects of metallophthalocyanines adsorbed on gold-electrode. Theoretical exploration of the binding nature role. / Miranda-Rojas, Sebastián; Sierra-Rosales, Paulina; Muñoz-Castro, Alvaro; Arratia-Pérez, Ramiro; Zagal, José Heráclito; Mendizábal, Fernando.

In: Physical Chemistry Chemical Physics, Vol. 18, No. 42, 01.01.2016, p. 29516-29525.

Research output: Contribution to journalArticle

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