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Novel acid-free process intensification for the synthesis of non-precious metal-nitrogen-carbon electrocatalysts for oxygen reduction reaction

Alessio Cosenza

Novel acid-free process intensification for the synthesis of non-precious metal-nitrogen-carbon electrocatalysts for oxygen reduction reaction.

Rel. Stefania Specchia. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Chimica E Dei Processi Sostenibili, 2022

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Abstract:

In this work, a set of PGM-free mono-metallic electrocatalysts (FeAD-N-CAF, Co-N-CAF, Mn-N-CAF, Ni-N-CAF) were synthesized using multiple silica templates with a modified acid-free sacrificial support method, characterized and tested for oxygen reduction reaction (ORR) in acidic, neutral and alkaline electrolytes. The removal of the silica template is achieved simultaneously to pyrolysis through the addition of Teflon powder to the mass of precursors before the heat treatment, resulting in a simple, fast and green approach compared to the conventional method based on the use of hydrofluoric acid (HF). Rotating ring disk electrode tests show that the iron-based electrocatalyst, among all, have higher activity for ORR. An electrocatalyst loading study was conducted with FeAD-N-CAF revealing a dual-site reaction mechanism and a maximum activity reached at 700 μg cm-2, while accelerated durability test highlights its promising stability. This novel synthesis route can be classified as a new intensified sustainable synthesis process.

Relatori: Stefania Specchia
Anno accademico: 2022/23
Tipo di pubblicazione: Elettronica
Numero di pagine: 74
Soggetti:
Corso di laurea: Corso di laurea magistrale in Ingegneria Chimica E Dei Processi Sostenibili
Classe di laurea: Nuovo ordinamento > Laurea magistrale > LM-22 - INGEGNERIA CHIMICA
Ente in cotutela: University of California Irvine (STATI UNITI D'AMERICA)
Aziende collaboratrici: University of California, Irvine
URI: http://webthesis.biblio.polito.it/id/eprint/24074
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