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Article Dans Une Revue Journal of The Electrochemical Society Année : 2023

New Insights into the Physicochemical and Electrochemical Characterization of Gold Phthalocyanine-Based Materials

Résumé

Gold phthalocyanine-based materials can allow to combine the unique physical properties of the metallophthalocyanine with gold for numerous applications such as (photo)-electrochemistry or the so-called single atom catalysts (SACs), which require very small amounts of metal. However, there is currently a lack of physico-chemical and electrochemical knowledge to consider such applications. We report the synthesis and the physical characterization of three types of materials, the unsubstituted and the octo-substituted gold phthalocyanines AuPc, AuPc(CN) 8 and AuPc(COOH) 8 , which were successfully synthesized. To interrogate the physicochemical and electrochemical properties of the as-synthesized materials, we have performed a multi-variant study by integrating different methods (UV–vis, FTIRS, TGA-TDA, HR-ESI-MS, SEM-EDX, XRD, XPS, CV). UV–vis confirms the shift towards high wavelengths (bathochromic effect) for the transition Q-band (charge transfer from pyrrolic carbons to neighboring atoms in the macrocycle) of AuPc(CN) 8 and AuPc(COOH) 8 compared to AuPc. CV in both aqueous and non-aqueous provides the first electrochemical insights into the phthalocyanine ring reduction and oxidation, AuPc/[AuPc] − , [AuPc] − /[AuPc] 2− and [AuPc] 2− /[AuPc] 3− . The results delineate a possible rational pathway for AuPc-based materials or alternatively, their transformation into SACs, where a single Au atom is embedded in a nanostructured carbon-nitrogen scaffold.

Domaines

Chimie

Dates et versions

hal-04290758 , version 1 (17-11-2023)

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Citer

Wend-Kuny Guy Aristide Nitiema, Bertrand Ouemega, Marie-Agnès Lacour, Sarra Knani, Eddy Petit, et al.. New Insights into the Physicochemical and Electrochemical Characterization of Gold Phthalocyanine-Based Materials. Journal of The Electrochemical Society, 2023, 170 (10), pp.106508. ⟨10.1149/1945-7111/ad032b⟩. ⟨hal-04290758⟩
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