Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	A solution-processed MoS2/graphene heterostructure mediated by a bifunctional block copolymer as a non-noble metal platform for hydrogen evolution
Δημιουργός/Συγγραφέας:	Plantzopoulou, Andriana 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:	2398-4902
DOI:	10.1039/D2SE00218C
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:	Sustainable Energy & Fuels
Τόμος/Κεφάλαιο:	6
Τεύχος:	11
Σελίδες:	2858–2867
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Χημεία (Γενικά)[EN] Chemistry (General) [EL] Χημική τεχνολογία[EN] Chemical technolgy [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	hydrogen peroxide Oxygen reduction reaction Graphene Polyacrylate anion Imidazolium cation
EU Grant identifier:	PID2019-104739GB-100/AEI/10.13039/501100011033 DGA E13-20R 823717 881603
Όροι και προϋποθέσεις δικαιωμάτων:	This article is Open Access.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1039/D2SE00218C
Σημειώσεις:	supplementary information: https://pubs.rsc.org/en/content/articlelanding/2022/se/d2se00218c The TEM studies were performed in the Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza (Spain). R.A. acknowledges support from the Spanish MICINN (PID2019-104739GB-100/AEI/10.13039/501100011033), Government of Aragon (projects DGA E13-20R (FEDER, EU)) and from EU H2020 “ESTEEM3” (Grant number 823717) and the Graphene Flagship (881603).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο