Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/19310
Title: Interface Engineering of MoS2-Modified Graphitic Carbon Nitride Nano-photocatalysts for an Efficient Hydrogen Evolution Reaction
Authors: Koutsouroubi, Eirini D. 
Vamvasakis, Ioannis 
Papadas, Ioannis T. 
Drivas, Charalampos 
Choulis, Stelios A. 
Kennou, Styliani 
Armatas, Gerasimos S. 
Major Field of Science: Natural Sciences
Field Category: Chemical Sciences
Keywords: Carbon nitride;MoS2;Nanostructures;Photocatalysis;Water splitting
Issue Date: Jul-2020
Source: ChemPlusChem, 2020, vol. 85, no. 7, pp. 1379-1388
Volume: 85
Issue: 7
Start page: 1379
End page: 1388
Journal: ChemPlusChem 
Abstract: Understanding of photochemical charge transfer processes at nanoscale heterojunctions is essential in developing effective catalysts. Here, we utilize a controllable synthesis method and a combination of optical absorption, photoluminescence, and electrochemical impedance spectroscopic studies to investigate the effect of MoS2 nanosheet lateral dimension and edge length size on the photochemical behavior of MoS2-modified graphitic carbon nitride (g-C3N4) heterojunctions. These nano-heterostructures, which comprise interlayer junctions with variable area (i. e., MoS2 lateral size ranges from 18 nm to 52 nm), provide a size-tunable interfacial charge transfer through the MoS2/g-C3N4 contacts, while exposing a large fraction of surface MoS2 edge sites available for the hydrogen evolution reaction. Importantly, modification of g-C3N4 with MoS2 layers of 39±5 nm lateral size (20 wt % loading) creates interfacial contacts with relatively large number of MoS2 edge sites and efficient electronic transport phenomena, yielding a high photocatalytic H2-production activity of 1497 μmol h−1 gcat−1 and an apparent QY of 3.3 % at 410 nm light irradiation. This study thus offers a design strategy to improve light energy conversion efficiency of catalysts by engineering interfaces at the nanoscale in 2D-layered heterojunction materials.
URI: https://hdl.handle.net/20.500.14279/19310
ISSN: 21926506
DOI: 10.1002/cplu.202000096
Rights: © Wiley
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : University of Crete 
Cyprus University of Technology 
University of Patras 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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