1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
2. Όλο το Αποθετήριο
3. Ερευνητικές ομάδες

Τύπος:	Ανακοίνωση σε συνέδριο
Τίτλος:	La0.8Sr0.2NixRu1-xO3 perovskitic oxides as electrocatalysts for oxygen reduction reaction in alkaline medium
Συγγραφέας:	[EL] Μπάμπος, Γεώργιος[EN] Bampos, Georgios [EL] Μπεμπέλης, Συμεών[EN] Bebelis, Symeon [EL] Ζορμπάς, Δημήτριος[EN] Zorbas, Dimitrios
Ημερομηνία:	Σεπ-2023
Περίληψη:	The development of alkaline anion exchange membrane fuel cells (AAEMFCs) is of particular research interest mostly due to the faster kinetics of oxygen reduction reaction (ORR) in alkaline environment compared to acidic environment, which allows the use of non-noble metal electrocatalysts [1]. Carbon – transition metal hybrids, non-metal doped nanostructured carbon materials as well as transition metal oxides, including mixed oxides with perovskite structure, are among the alternative electrocatalysts that have been studied for the ORR in alkaline environment [1, 2]. In the present work six (6) perovskite oxides namely, LaNiO3, La0.8Sr0.2NiO3, LaNi0.99Ru0.01O3, La0.8Sr0.2Ni0.99Ru0.01O3, LaNi0.9Ru0.1O3 and La0.8Sr0.2Ni0.9Ru0.1O3 were synthesized using the in situ combustion synthesis method, followed by thermal treatment in stagnant air at 900 oC and, for LaNiO3 and La0.8Sr0.2NiO3, also at 700 oC for comparison. Then, mechanically mixed with carbon black (perovskite to carbon mass ratio equal to 3:1), were tested towards their ORR activity in O2 saturated 0.1 M KOH solution using the rotating disk electrode (RDE) technique, with the electrocatalysts in the form of thin-porous films deposited on a glassy carbon electrode [2]. The specific surface area (SSA) and the structural characteristics of the synthesized perovskite powders were determined employing N2 physisorption (BET method) and X-ray diffraction, respectively. The tested electrocatalysts were compared in terms of specific activity S.A. = Ik/SSA (Fig. 1a) and mass activity M.A. = Ik/moxide (Fig. 1b), where Ik denotes the kinetic current and moxide the perovskite oxide mass, over a range of ohmic drop free electrocatalyst potentials U-IR. Figure 1. Specific (a) and mass (b) activity of the tested perovskite electrocatalysts in 0.1 M KOH at room temperature (mass transfer corrected Tafel plots) Partial substitution of La by Sr in the A-sites and of Ni by Ru in the B-sites resulted in an increase of the SSA but in decrease of the ORR activity (Figs. 1a, 1b). The LaNiO3 electrocatalyst thermally treated at 900 oC exhibited the highest ORR performance in terms of both specific activity (Fig. 1a) and mass activity (Fig. 1b), equal to 7.6 A moxide-2 and 30.5 A goxide-1 at -0.4 V vs. Ag/AgCl, respectively. Moreover, for both LaNiO3 and La0.8Sr0.2NiO3 the decrease of the heat treatment temperature from 900 oC to 700 oC resulted in decrease of the ORR activity. [1] Ge, X., Sumboja, A., Wuu, D., et al. (2015). ACS Catal. 5: 4643–4667. [2] Safakas, A., Bampos, G., Bebelis, S. (2019). Appl. Catal. B. 244: 225-232.
Γλώσσα:	Αγγλικά
Τόπος δημοσίευσης:	Lyon, France
Σελίδες:	1
Θεματική κατηγορία:	[EL] Χημική μηχανική[EN] Chemical Engineering
Κάτοχος πνευματικών δικαιωμάτων:	© The Author(s) 2023
Όνομα εκδήλωσης:	74th Annual ISE Meeting
Τοποθεσία εκδήλωσης:	Lyon, France
Ημ/νία έναρξης εκδήλωσης:	03/09/2023
Ημ/νία λήξης εκδήλωσης:	08/09/2023
Σημειώσεις:	https://annual74.ise-online.org/img_conf/ISE-AM74-program_web.pdf This research was funded in the frame of the project “Perovskitic electrocatalysts for integrated systems of microbial electrolysis cells and anion exchange membrane fuel cells (Acronym: PERFORMANCE, project code: 82242)”, which was supported by the 3rd Call of Hellenic Foundation of Research and Innovation (H.F.R.I.) Research Projects for the support of Post-doctoral Researchers (fellowship of Dr. G. Bampos).
Εμφανίζεται στις συλλογές:	Ερευνητικές ομάδες