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https://hdl.handle.net/2440/117500
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Type: | Journal article |
Title: | Flower-like MoS₂ on graphitic carbon nitride for enhanced photocatalytic and electrochemical hydrogen evolutions |
Other Titles: | Flower-like MoS(2) on graphitic carbon nitride for enhanced photocatalytic and electrochemical hydrogen evolutions |
Author: | Liu, Y. Xu, X. Zhang, J. Zhang, H. Tian, W. Li, X. Tade, M.O. Sun, H. Wang, S. |
Citation: | Applied Catalysis B: Environmental, 2018; 239:334-344 |
Publisher: | Elsevier |
Issue Date: | 2018 |
ISSN: | 0926-3373 1873-3883 |
Statement of Responsibility: | Yazi Liu, Xinyuan Xu, Jinqiang Zhang, Huayang Zhang, Wenjie Tian, Xiaojie Li, Moses O. Tade, Hongqi Sun, Shaobin Wang |
Abstract: | Design of highly efficient catalysts has already been a challenge in the exploration of renewable energies based on nanotechnologies. Herein, a feasible strategy of three-dimensional (3D)/two-dimensional (2D) nanojunctions was employed to achieve a prominently enhanced activity in both solar hydrogen evolution and electrochemical hydrogen generation from water splitting. Flower-like MoS₂ nanoparticles with thin-layers were fabricated using a one-pot hydrothermal process and were further attached to g-C₃N₄ nanosheets via their (002) crystal planes to form an intimate face-to-face contact. The hybrid catalysts exhibited a red-shift to the visible light region with an enhanced absorption capacity. At the optimal loading of 0.5 wt% MoS₂, MoS₂/g-C₃N₄ exhibited the highest photocatalytic H₂ evolution rate of 867.6 μmol h⁻¹ g⁻¹ under simulated sunlight irradiations, which is 2.8 times as high as that of pure g-C₃N₄. Furthermore, the average photocatalytic H₂ evolution rate was elevated to ca. 5 times as high as that of pure g-C₃N₄ under visible light irradiations. The synergistic effect responsible for the enhanced HER (hydrogen evolution reaction) performance might be originated from the intimate interface between the light-harvesting g-C₃N₄ and MoS₂ as the active sites with the decreased overpotential, lowered charge-transfer resistance and increased electrical conductivity, leading to a more efficient charge separation and a higher reductive potential. In addition, the lower overpotential and smaller Tafel slope on 0.5 wt% MoS₂/g-C₃N₄ lead to the enhancement of electrochemical HER performance compared to pure g-C₃N₄. This work provides a feasible protocol for rational design of highly efficient HER electrocatalysts and photocatalysts towards future energy innovation. |
Keywords: | MoS₂; photocatalysis; electrochemical reduction; hydrogen evolution reaction (HER); g-C₃N₄ |
Rights: | © 2018 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.apcatb.2018.08.028 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 http://purl.org/au-research/grants/arc/LE120100026 |
Published version: | http://dx.doi.org/10.1016/j.apcatb.2018.08.028 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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