Alloy-Tunable Single-Layer 2D Heterophase Photocatalysts for Efficient Solar Fuel Production-Reference-Cited by-同舟云学术

Alloy-Tunable Single-Layer 2D Heterophase Photocatalysts for Efficient Solar Fuel Production

Published:2024-02-21 Issue: Volume: Page:
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Author:

Jia Guohua¹^ORCID,Chen Jiayi¹,Uddin Md Nasir²,Liu Xiaozhi³^ORCID,Mao Rundong¹,Liu Kaili²,Hsu Hsien-Yi⁴,Su Dong³^ORCID,Li Yunguo⁵^ORCID,Hadar Ido⁶^ORCID,Buntine Mark¹,Yang Xuyong⁷^ORCID,Yin Zongyou²^ORCID

Affiliation:

1. Curtin University

2. Australian National University

3. Institute of Physics, Chinese Academy of Sciences

4. City University of Hong Kong

5. University of Science and Technology of China

6. The Hebrew University of Jerusalem

7. Shanghai University

Abstract

Abstract Earth-abundant two-dimensional (2D) transition metal dichalogenate (TMD) nanosheets manifesting both polymorphic 1T’ metallic and 2H semiconducting characteristics have been demonstrated as efficient photocatalysts. Despite considerable efforts have been devoted to synthesizing such material, it is still a stunning challenge to precisely tailor the ratio of metallic and semiconducting phases within an individual single-layer 2D TMD nanosheet to maximize their potential in photocatalysis. Herein, we developed a chemical alloying strategy through incorporating W and/or Se elements into MoS2, which enables precise tuning the ratio of 1T’ and 2H phases in single-layer TMD nanosheets. Aberration-corrected scanning transmission electron microscopy reveals the presence of the 1T’/2H heterophase in individual single-layer MoxW1-xS2 nanosheets. Density functional theory (DFT) simulations reveal that the tunability of 1T’ and 2H heterophase enabled through W element alloying optimize the balance of charge separation and absorption. This consequently boosts significantly the photocatalytic hydrogen production reaction from a liquid carrier of methanol, yielding a record high hydrogen generation rate of 1,426 mmole·g-1·h-1 in single-layer Mo0.21W0.79S2 nanosheets.

Publisher

Research Square Platform LLC

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