Liquid exfoliation of g-C3N4 nanosheets to construct 2D-2D MoS2/g-C3N4 photocatalyst for enhanced photocatalytic H2 production activity

By Yongjun Yuan, Zhi-Kai Shen, Shiting Wu, Yibing Su, Lang Pei, Z. Ji, M. Ding, Wangfeng Bai, Yifan Chen, Zhentao Yu and 1 more. Applied Catalysis B: Environmental, 2019

597 citations recorded by the source corpus.

Abstract Although graphitic carbon nitride (g-C3N4) is an attractive photocatalyst for solar H2 generation, the preparation of g-C3N4 nanosheets via a “green” and simple method as well as the construction of highly-efficient g-C3N4-based photocatalysts are still challenges. In this study, g-C3N4 nanosheets prepared by a simple probe sonication assisted liquid exfoliation method were used to construct 2D-2D MoS2/g-C3N4 photocatalyst for photocatalytic H2 production. The 2D-2D MoS2/g-C3N4 photocatalyst containing 0.75% MoS2 showed the highest H2 evolution rate of 1155 μmol·h−1·g−1 with an apparent quantum yield of 6.8% at 420 nm monochromatic light, which is much higher than that of the optimized 0D-2D Pt/g-C3N4 photocatalyst. The high photocatalytic H2 production activity of 2D-2D MoS2/g-C3N4 photocatalyst can be attributed to the large surface area and the formed 2D interfaces between MoS2 and g-C3N4 nanosheets. As demonstrated by photoluminescence quenching and time-resolved fluorescence decay studies, the 2D interfaces can accelerate the photoinduced charge transfer, resulting in the high photocatalytic H2 production performance. This study provides a new strategy in developing highly-efficient g-C3N4-based photocatalysts for H2 production via using 2D nanojunction as a bridge to promote the photoinduced charge separation and transfer.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/c7528fc8f24740dacc7eed009b337b03d4f0b8d4

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In Electrical and Electronic Engineering

1. B. Martincigh
2. V. Nyamori
3. J. Kibet
4. Nicholas Rono

In Materials Chemistry

1. B. Martincigh
2. V. Nyamori
3. J. Kibet
4. Nicholas Rono

In Renewable Energy, Sustainability and the Environment

1. B. Martincigh
2. V. Nyamori
3. J. Kibet
4. Nicholas Rono

Citations in the corpus

• Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts (2019, unknown): “In most of the studies, it was reported that g-C3N4 acts as an outstanding template and there was no H2 production on g-C3N4 without any noble metal co-catalyst [444,445].”
• Photocatalytic conversion of biomass-based monosaccharides to lactic acid by ultrathin porous oxygen doped carbon nitride (2021, background): “[10-13] Despite of advantages in photocatalysis, developing biorefinery via photocatalytic technology remains in its early stage.”
• A review of the current status of graphitic carbon nitride (2020, methodology): “[34,107,108] Yuan et al.([34]) prepared g-C3N4 via the liquid exfoliation method: bulk g-C3N4 was first obtained by thermal decomposition of urea, this was then dispersed in N-methylpyrrolidone, and thereafter ultrasonication was carried out to obtain g-C3N4.”