MoS 2 Nanoflowers Grown on Plasma-Induced W-Anchored Graphene for Efficient and Stable H 2 Production Through Seawater Electrolysis.

Autor: Dang VD; Faculty of Biology and Environment, Ho Chi Minh City University of Industry and Trade, 140 Le Trong Tan, Ho Chi Minh, 700000, Vietnam., Putikam R; Department of Applied Chemistry, Center for Interdisciplinary Molecular Science, National Yang Ming Chiao Tung University, Hsinchu, 300, Taiwan., Lin MC; Department of Applied Chemistry, Center for Interdisciplinary Molecular Science, National Yang Ming Chiao Tung University, Hsinchu, 300, Taiwan., Wei KH; Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Jan; Vol. 20 (2), pp. e2305220. Date of Electronic Publication: 2023 Sep 01.
DOI: 10.1002/smll.202305220
Abstrakt: Herein, it is found that 3D transition metal dichalcogenide (TMD)-MoS 2 nanoflowers-grown on 2D tungsten oxide-anchored graphene nanosheets (MoS 2 @W-G) functions as a superior catalyst for the hydrogen evolution reaction (HER) under both acidic and alkaline conditions. The optimized weight ratio of MoS 2 @W-G (MoS 2 :W-G/1.5:1) in 0.5 M H 2 SO 4 achieves a low overpotential of 78 mV at 10 mA cm -2 , a small Tafel slope of 48 mV dec -1 , and a high exchange current density (0.321 mA cm⁻ 2 ). Furthermore, the same MoS 2 @W-G composite exhibits stable HER performance when using real seawater, with Faradaic efficiencies of 96 and 94% in acidic and alkaline media, respectively. Density functional theory calculations based on the hybrid MoS 2 @W-G structure model confirm that suitable hybridization of 3D MoS 2 and 2D W-G nanosheets can lower the hydrogen adsorption: Gibbs free energy (∆G H* ) from 1.89 eV for MoS 2 to -0.13 eV for the MoS 2 @W-G composite. The excellent HER activity of the 3D/2D hybridized MoS 2 @W-G composite arises from abundance of active heterostructure interfaces, optimizing the electrical configuration, thereby accelerating the adsorption and dissociation of H 2 O. These findings suggest a new approach for the rational development of alternative 3D/2D TMD/graphene electrocatalysts for HER applications using seawater.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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