Electrocatalytic oxygen reduction reaction promoted by titanium‐based tetrapyrazinoporphyrazines

Applied Organometallic Chemistry, vol. 37

Abstract

In this study, we unveiled titanium‐based tetrapyrazinoporphyrazines as a valuable alternative to noble metals in the oxygen reduction reaction (ORR). By simply modifying the synthetic conditions, we were able to tune the ORR selectivity while showing that the introduction of substituents on the macrocycle periphery is detrimental to the ability of the complex to reduce molecular oxygen. A complete electrochemical characterization in different conditions is reported together with rotating ring‐disk electrode measurements, which assessed the possibility of selectively switching from 2‐ to a 4‐electron reduction product changing the titanium precursor amounts during the complex synthesis.

Authors 7

1. Fabrizio Sordello corresponding

   University of Turin

   Affiliation as printed

   Department of Chemistry University of Turin Turin Italy

   Department of Chemistry, University of Torino, Torino, Italy

2. Pelagia‐Nefeli Prantsidou‐Georgiadou

   University of Turin

   Affiliation as printed

   Department of Chemistry University of Turin Turin Italy

   Department of Chemistry, University of Torino, Torino, Italy

3. Emanuele Azzi

   University of Turin

   Affiliation as printed

   Department of Chemistry University of Turin Turin Italy

   Department of Chemistry, University of Torino, Torino, Italy

4. Yannick S. Tschauder Aachen Chemical Process Engineering AVT.CVT Institute of Inorganic Chemistry

   RWTH Aachen University

   Affiliation as printed

   Chemical Process Engineering AVT.CVT RWTH Aachen University Aachen Germany

   Institute of Inorganic Chemistry RWTH Aachen University Aachen Germany

   Chemical Process Engineering AVT.CVT, RWTH Aachen University, Aachen, Germany

   Institute of Inorganic Chemistry RWTH Aachen University Aachen Germany

5. Dario Formenti Aachen Institute of Inorganic Chemistry

   RWTH Aachen University

   Affiliation as printed

   Institute of Inorganic Chemistry RWTH Aachen University Aachen Germany

   Institute of Inorganic Chemistry RWTH Aachen University Aachen Germany

6. Francesco Pellegrino

   University of Turin

   Affiliation as printed

   Department of Chemistry University of Turin Turin Italy

   Department of Chemistry, University of Torino, Torino, Italy

7. Polyssena Renzi corresponding

   University of Turin

   Affiliation as printed

   Department of Chemistry University of Turin Turin Italy

   Department of Chemistry, University of Torino, Torino, Italy