Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Core–Shell Pd@M (M=Ni, Cu, Co) Nanoparticles/Graphene Ensembles with High Mass Electrocatalytic Activity Toward the Oxygen Reduction Reaction
Δημιουργός/Συγγραφέας:	Perivoliotis D.K. Sato Y. Suenaga K. [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Εκδότης:	Wiley-VCH Verlag
Ημερομηνία:	2019
Γλώσσα:	Αγγλικά
ISSN:	0947-6539
DOI:	10.1002/chem.201901588
Άλλο:	PubMed ID: 31152611
Περίληψη:	Herein, it is demonstrated that pyrene butyric acid (PBA)-stabilized metal nanoparticles with core–shell morphology, Pd@MNPs (M=Ni, Cu, Co), non-covalently supported on graphene (G) sheets, are more active towards oxygen electroreduction in alkaline environments than the benchmark Pd/C catalyst, albeit with a 70 % lower precious metal loading. The PBA-stabilized Pd@MNPs (M=Ni, Cu, Co)/G ensembles were prepared by employing a simple modified polyol method and galvanic replacement and thoroughly characterized with advanced microscopy imaging and complementary spectroscopic techniques. Electrochemical studies revealed that Pd@NiNPs/G presents the optimum performance, exhibiting a 30 mV more positive onset potential and 3.2 times greater mass activity over Pd/C. Moreover, chronoamperometric assays showed the minimum activity loss for Pd@NiNPs/G, not only among its core–shell counterparts but importantly when compared with the benchmark catalyst. The excellent performance of Pd@NiNPs/G was attributed to the (a) presence of PBA as stabilizer, (b) uniform Pd@NiNPs dispersion onto the graphene sheets, (c) efficient intra-ensemble interactions between the two species, (d) existence of the core–shell structure for Pd@NiNPs, and (e) stability of the Ni core metal under the reaction conditions. Last, the oxygen reduction on Pd@NiNPs/graphene occurs by the direct four-electron reduction pathway, showing great potential for use in energy related applications.
Τίτλος πηγής δημοσίευσης:	Chemistry - A European Journal
Τόμος/Κεφάλαιο:	25
Τεύχος:	47
Σελίδες:	11105-11113
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	core–shell nanoparticles energy conversion graphene hybrid electrocatalysts oxygen reduction reaction
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Σημειώσεις:	European Commission, EC; Japan Society for the Promotion of Science, KAKEN: JP16H06333, JP19K05223; General Secretariat for Research and Technology, GSRT; European Regional Development Fund, ERDF; Hellenic Foundation for Research and Innovation, ΕΛ.ΙΔ.Ε.Κ: MIS 5002409 Financial support through a Ph.D. scholarship by the General Secretariat for Research and Technology (GSRT)–Hellenic Foundation for Research and Innovation (HFRI) to D.K. Perivoliotis (Grant 95) is acknowledged. We acknowledge support of this work by the project “Advanced Materials and Devices” (MIS 5002409), which is implemented under the “Action for the Strategic Development on the Research and Technological Sector”, funded by the Operational Program “Competitiveness, Entrepreneurship, and Innovation” (NSRF 2014‐2020) and co‐financed by Greece and the European Union (European Regional Development Fund). Y.S. and K.S. acknowledge JSPS KAKENHI (Grant Nos. JP19K05223 and JP16H06333, respectively) for financial support.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο