DataVXACS Applied Materials & InterfacesPaper
journal article·2020-10-14Open access

Organic Polyradicals as Redox Mediators: Effect of Intramolecular Radical Interactions on Their Efficiency

Elena Badetti, Vega Lloveras, Emanuele Amadio, Rosalia Di Lorenzo, Mara Olivares-Marín, Alvaro Y. Tesio, Songbai Zhang, Fangfang Pan, Kari Rissanen, Jaume Veciana, Dino Tonti, Jose Vidal-Gancedo, Cristiano Zonta, Giulia Licini

ACS Applied Materials & Interfaces· Volume 12· Issue 41
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Source abstract

Abstract

The spin-spin interactions between unpaired electrons in organic (poly)radicals, especially nitroxides, are largely investigated and are of crucial importance for their applications in areas such as organic magnetism, molecular charge transfer, or multiple spin labeling in structural biology. Recently, 2,2,6,6-tetramethylpiperidinyloxyl and polymers functionalized with nitroxides have been described as successful redox mediators in several electrochemical applications; however, the study of spin-spin interaction effect in such an area is absent. This communication reports the preparation of a novel family of discrete polynitroxide molecules, with the same number of radical units but different arrangements to study the effect of intramolecular spin-spin interactions on their electrochemical potential and their use as oxidation redox mediators in a Li-oxygen battery. We find that the intensity of interactions, as measured by the d1/d electron paramagnetic resonance parameter, progressively lowers the reduction potential. This allows us to tune the charging potential of the battery, optimizing its energy efficiency.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

Energy storagePolymers

OpenAlex topics: Conducting polymers and applications · Inorganic and Organometallic Chemistry · Polyoxometalates: Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical Sciences and CIRCC Padova Unit, University of Padova, Via Marzolo 1, 35131 Padova, Italy

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain

Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), E-08193 Barcelona, Spain

Department of Mechanical, Energy and Materials Engineering, University Centre of Mérida, University of Extremadura, Avda. Santa Teresa de Jornet, 38, 06800 Mérida, Spain

Centro de Investigación y Desarrollo en Materiales Avanzados y Almacenamiento de Energía de Jujuy (CIDMEJu), Centro de Desarrollo Tecnológico General Manuel Savio, Av. Martijena S/N, Palpalá Y 4612, Jujuy, Argentina

Department of Chemistry, University of Jyvaskyla, P. O. Box 35, 40014 Jyväskylä, Finland

Funding

Ministerio de Econom?a y Competitividad · Ag?ncia de Gesti? d'Ajuts Universitaris i de Recerca

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