Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Cobalt porphyrin/molybdenum disulfide nanoensembles for light-assisted electrocatalytic water oxidation and selective hydrogen peroxide production
Δημιουργός/Συγγραφέας:	Perivoliotis, Dimitrios K Stangel, Christina Sato, Yuta Suenaga, Kazu [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Ημερομηνία:	2022
Γλώσσα:	Αγγλικά
ISSN:	2053-1583
DOI:	10.1088/2053-1583/ac9290
Περίληψη:	The development of photo/electroactive catalysts sustainably producing hydrogen from water splitting and selectively hydrogen peroxide is of paramount importance to alleviate climate change effects. Herein, an anionic cobalt porphyrin (CoP) derivative is electrostatically interfaced with a positively charged modified molybdenum disulfide (MoS2), forming CoP/MoS2, which is accordingly employed as nonprecious photo/electrocatalyst for water oxidation reaction (WOR) and selective H2O2 production. According to the results, CoP/MoS2 shows remarkable bifunctional photo/electrocatalytic performance for WOR and 2e− pathway O2 reduction reaction (ORR) in alkaline electrolyte. Upon visible light irradiation, electrochemical measurements on a fluorine-doped tin oxide (FTO) coated glass electrode reveal an onset potential of 0.595 mV (ORR) and 1.575 mV (WOR) vs. reversible hydrogen electrode, being improved by approximately 80 mV, in both cases, compared to the dark conditions. Notably, the use of the FTO set-up not only enabled us to evaluate the photo/electrocatalytic activity of the CoP/MoS2 nanoensemble but also mimics the practical conditions in photo/electrochemical devices. The outstanding bifunctional photo/electrocatalytic performance of CoP/MoS2 is attributed to (a) the use of CoP as versatile single-atom molecular catalyst and photosensitizer (b) the strong ion-pair interactions between cationic modified MoS2 and the anionic CoP derivative, which prevent aggregation, ensuring better accessibility of the reactants to cobalt active sites, and (c) the co-existence of 1T and 2H phase at modified MoS2, offering improved electrical conductivity and intrinsic electrocatalytic activity along with enhanced intraensemble electronic interactions upon illumination. This work is expected to inspire the design of advanced and low-cost materials for the sustainable production of renewable fuels.
Τίτλος πηγής δημοσίευσης:	2D Materials
Τόμος/Κεφάλαιο:	10
Τεύχος:	1
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Χημική μηχανική[EN] Chemical engineering
Λέξεις-Κλειδιά:	Bifunctional photo/electrocatalysts Water oxidation Hydrogen peroxide Renewable fuels Transition metal dichalcogenides Cobalt porphyrins
EU Grant:	Reinforcement of Postdoctoral Researchers—2nd Cycle JSPS KAKENHI JST-CREST
EU Grant identifier:	MIS-5033021 JP22K04886 JPMJCR20B1
Κάτοχος πνευματικών δικαιωμάτων:	© 2022 The Author(s). Published by IOP Publishing Ltd
Όροι και προϋποθέσεις δικαιωμάτων:	Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1088/2053-1583/ac9290
Σημειώσεις:	This research is co-financed by Greece and the European Union (European Social Fund—ESF) through the Operational Programme ‘Human Resources Development, Education and Lifelong Learning’ in the context of the project ‘Reinforcement of Postdoctoral Researchers—2nd Cycle’ (MIS-5033021), implemented by the State Scholarships Foundation (IKY). Y S and K S acknowledge JSPS KAKENHI (Grant No. JP22K04886) and JST-CREST (Grant No. JPMJCR20B1), respectively, for financial support. XRD and XPS measurements were supported by Umeå University facilities. The authors wish to thank Dr Andrey Shchukarev for XPS measurements and analysis. D K P and C S contributed equally to this work.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο