Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Nanoarchitectured N-Heterocyclic Carbene-Pt Nanoparticles on Carbon Nanotubes: Toward Advanced Electrocatalysis in the Hydrogen Evolution Reaction
Δημιουργός/Συγγραφέας:	Rapakousiou, Amalia Minadakis, Michail P. Chalkidis, Savvas G Ruiz-González, María Luisa Navio, Cristina Vougioukalakis, Georgios C [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Χορηγός :	HellenicFoundation for Research and Innovation (H.F.R.I.)
Ημερομηνία:	2025-03-13
Γλώσσα:	Αγγλικά
ISSN:	1944-8244 1944-8252
DOI:	10.1021/acsami.5c02182
Άλλο:	40080448
Περίληψη:	In response to the need for sustainable energy, this study focuses on advancing the electrocatalytic Hydrogen Evolution Reaction (HER). Considering platinum-based catalysts' efficacy, but acknowledging their cost and scarcity implications, our work pursues Pt content minimization, simultaneously upholding catalytic efficiency. Our approach introduces a precisely engineered nanoarchitecture, leveraging multiwalled carbon nanotubes (MWCNTs) bearing anchored N-heterocyclic carbenes (NHCs). These carbenes form robust covalent bonds with ultrastable, highly crystalline, platinum nanoparticles (PtNPs), establishing MWCNTs-NHC-PtNPs as a highly efficient electrocatalyst. The synergistic effect of NHCs and triazole moieties facilitates controlled nanoparticle growth and stabilization, yielding 2.0 ± 0.3 nm, uniformly distributed {1 1 1}-faceted PtNPs. The as-obtained MWCNTs-NHC-PtNPs nanomaterial exhibits exceptional HER efficiency in 0.5 M H2SO4 with an overpotential of 77 mV at -10 mA cm-2 and a 50 mV dec-1 Tafel slope, despite containing a merely 0.4% Pt/C atomic ratio content, as determined by XPS. Notably, at 200 mV overpotential, the mass activity reaches 8.6 A/mgPt and the specific activity is 53 mA/cm2Pt, highlighting the efficiency of each Pt site within this nanostructure. Cyclic voltammetry reveals a distinctive, reversible PtO/Pt redox process, demonstrating surface-controlled and diffusion-assisted kinetics with charge storage properties that stabilize the electrocatalyst's electron-surface and facilitate proton reduction. Equally important, the nanoarchitecture prevents aggregation and mitigates Pt irreversible oxidation, showcasing enhanced stability after extensive cycling and exposure to air. Comparative analyses with a control electrocatalyst lacking NHC-PtNPs ligation emphasize the unique role of NHC-Pt (0) bonding in enhancing electrocatalytic efficiency. Comprehensive surface and electronic property analyses validate the potential of the MWCNTs-NHC-PtNPs platform.
Τίτλος πηγής δημοσίευσης:	ACS applied materials & interfaces
Θεματική Κατηγορία:	[EL] Νανοτεχνολογία[EN] Nanotechnology [EL] Χημεία[EN] Chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	N-heterocyclic carbenes (NHCs) carbon nanotubes electrocatalysis hydrogen evolution reaction (HER) mass activity platinum nanoparticles (PtNPs) redox behavior specific activity
EU Grant:	2nd Call for H.F.R.I. Research Projects to support Post-doctoral Researchers
EU Grant identifier:	NANOElectroCAT, project Number 913
Κάτοχος πνευματικών δικαιωμάτων:	© 2025 The Authors. Published by American Chemical Society
Όροι και προϋποθέσεις δικαιωμάτων:	This publication is licensed under CC-BY 4.0.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1021/acsami.5c02182
Σημειώσεις:	Research article
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο