Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Graphene featuring imidazolium rings and electrostatically immobilized polyacrylate chains as metal-free electrocatalyst for selective oxygen reduction to hydrogen peroxide
Δημιουργός/Συγγραφέας:	Vorvila, Maria-Lydia Sideri, Ioanna K. Stergiou, Anastasios Kafetzi, Martha [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Arenal, Raul [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Ημερομηνία:	2022
Γλώσσα:	Αγγλικά
ISSN:	09277757
DOI:	10.1016/j.colsurfa.2022.129252
Περίληψη:	While graphene-based materials hold a strong potential as electrocatalysts, owing to their astonishing properties and functionalization capability, their intrinsic catalytic activity is more often masked under the umbrella of the precious and industrial metals that are used as counterparts for boosting the electrocatalytic performance. In the present work, we envisioned and realized a simple, stepwise surface engineering path for the modification of graphene oxide, aiming at elevating its intrinsic electrocatalytic activity, excluding any metals, towards the oxygen reduction reaction (ORR). More specifically, oxidized graphene was initially covalently decorated with amphoteric imidazole rings, which were then converted to the corresponding imidazolium counterparts. At the last step, anion exchange of the grafted imidazolium species was performed to immobilize via electrostatic interactions polyacrylate chains. The electrocatalytic performance of the so-formed graphene-based ensembles towards the ORR in alkaline media was evaluated, unveiling the 2e– reduction of oxygen, selectively producing hydrogen peroxide. The results indicate that both covalent and non-covalent surface engineering of graphene with organic chains matters towards electrocatalysis and should not be considered negligible. Our findings and insights provided are a stepping stone on the quest of graphene-based ensembles as metal-free electrocatalysts.
Τίτλος πηγής δημοσίευσης:	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Τόμος/Κεφάλαιο:	648
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Χημική τεχνολογία[EN] Chemical technolgy [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	hydrogen peroxide Oxygen reduction reaction Graphene Polyacrylate
EU Grant:	DGA E13-20R EU H2020 “ESTEEM3″
EU Grant identifier:	PID2019-104739GB-100/AEI/10.13039/501100011033 DGA E13-20R
Κάτοχος πνευματικών δικαιωμάτων:	© 2022 Elsevier B.V. All rights reserved.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://www.sciencedirect.com/science/article/pii/S092777572201007X#ack0005
Σημειώσεις:	supplementary material: https://www.sciencedirect.com/science/article/pii/S092777572201007X#sec0070
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο