Title

Flower-like MoS2 on graphitic carbon nitride for enhanced photocatalytic and electrochemical hydrogen evolutions

Document Type

Journal Article

Publisher

Elsevier

Place of Publication

Netherlands

School

School of Engineering

Comments

Originally published as: Liu, Y., Xu, X., Zhang, J., Zhang, H., Tian, W., Li, X., ... & Wang, S. (2018). Flower-like MoS2 on Graphitic Carbon Nitride for Enhanced Photocatalytic and Electrochemical Hydrogen Evolutions. Applied Catalysis B: Environmental, 239, 334-344. Original article available here.

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.

DOI

10.1016/j.apcatb.2018.08.028

Access Rights

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