Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	(Photo)electrocatalysis of molecular oxygen reduction by S-doped graphene decorated with a star-shaped oligothiophene
Δημιουργός/Συγγραφέας:	Stergiou A. Perivoliotis D.K. [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Εκδότης:	Royal Society of Chemistry
Ημερομηνία:	2019
Γλώσσα:	Αγγλικά
ISSN:	2040-3364
DOI:	10.1039/c9nr01620a
Άλλο:	PubMed ID: 30938747
Περίληψη:	Heteroatom-doped graphene-based materials attract great interest as non-metal electrocatalysts for the oxygen reduction reaction (ORR). In this work, a straightforward approach was described to prepare nanoensembles of star-shaped oligothiophene 1 supramolecularly immobilized on sulfur-doped graphene sheets (SG). The 1/SG ensemble was comprehensively characterized by Raman and IR spectroscopy and morphologically imaged by HR-TEM, while the loading of 1 onto SG was estimated by TGA under an inert atmosphere. Based on detailed electrochemical and electrocatalytic assays, 1/SG was proved to be a highly efficient and stable electrocatalyst toward the ORR. The high catalytic activity of 1/SG was attributed to the (a) presence of chemical defects, induced by the insertion of electron rich sulfur within the lattice of SG, (b) existence of structural defects, due to the generation of vacancies along the carbon lattice in SG, and (c) high and homogeneous coverage of the SG surface by the sulfur-rich star-shaped oligothiophene 1. In addition, the optical properties of 1/SG were screened by UV-Vis and steady-state and time-resolved PL and the development of strong photoinduced intra-ensemble electronic interactions within the ensemble was revealed. Exploiting the latter, by photoirradiating 1/SG, a significantly improved photoelectrocatalytic activity towards the ORR was observed.
Τίτλος πηγής δημοσίευσης:	Nanoscale
Τόμος/Κεφάλαιο:	11
Τεύχος:	15
Σελίδες:	7335-7346
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 The Royal Society of Chemistry.
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Hybrid Gold
Σημειώσεις:	European Commission, EC; General Secretariat for Research and Technology, GSRT; European Regional Development Fund, FEDER; Hellenic Foundation for Research and Innovation, HFRI 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 Programme “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014–2020) and co-financed by Greece and the European Union (European Regional Development Fund). 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. P. (Grant 95) is also acknowledged. We are indebted to Prof. M. Prodromidis, at the Department of Chemistry, University of Ioannina, Greece, for kindly providing the RDE system, to Prof. A. G. Coutsolelos and Dr G. Charalambidis at the Department of Chemistry, University of Crete, Greece, for kind assistance with the MALDI-TOF-MS acquisition, and to Prof. H. Shinohara and his group at the Department of Chemistry, Nagoya University, Japan, for kindly providing access to perform the HR-TEM and EDX measurements.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο