One-step synthesis of MoS 2 /Bi 2 S 3 heterojunction with enhanced photocatalytic activity and high electrochemical perf

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One-step synthesis of MoS2/Bi2S3 heterojunction with enhanced photocatalytic activity and high electrochemical performance Jianing Liao1,2, Yi Zhong1, Zetian He1, Hao Ding1, Kai Chen3, and Daimei Chen1,*

1

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China 2 School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China 3 Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring, and Pollution Control School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received: 20 September 2020

ABSTRACT

Accepted: 10 November 2020

A three-dimensional (3D) flower-like MoS2/Bi2S3 heterojunction is successfully synthesized through a simple one-step hydrothermal route. The special 3D morphology, achieved by assembling 2D MoS2 nanosheets onto 3D Bi2S3 micro-flowers, helps to promote the photogenerated electron–hole separation and the electronic conduction. Thus, the as-prepared MoS2/Bi2S3 heterojunction exhibits a prominent photocatalysis activity and electrochemical performance. Compared with pure Bi2S3 (11.8%) and MoS2 (49.2%), the heterojunction demonstrates the higher percentage of methylene blue degradation (76.2%). The enhanced photocatalytic activity is attributed to the effective separation of the charge carriers between Bi2S3 and MoS2, which is not possible with individual materials. When the MoS2/Bi2S3 heterojunction is tested as a supercapacitor electrode, it shows an optimum capacitance of 100.2 F/g at a current density of 1 A/g, which is about 22-times higher than that of pure Bi2S3 (4.5 F/g). With the key findings, the potential of metal sulfides heterojunction for multifunctional applications is highly expected.

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Springer Science+Business

Media, LLC, part of Springer Nature 2020

1 Introduction With the development of modern industry and the aggravation of environmental pollution, the fabrication and utilization of high-efficiency and cost-

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https://doi.org/10.1007/s10854-020-04877-4

efficient photocatalysts have attracted worldwide attention due to ever-increasing demands for solving renewable energy and environmental issues [1–3]. Metal sulfides have wide applications in environmental photocatalysis due to their narrow band gaps, unique structure, and satisfactory catalytic activity

J Mater Sci: Mater Electron

[4–8]. Especially, Bi2S3 with a direct narrow band gap of 1.3–1.7 eV has caused widespread concern in the field of photocatalysis based on its unique electric and optical properties [9, 10]. However, the photocatalytic activity of pure Bi2S3 is significantly lower than expected due to its severe charge recombination and structural photocorrosion [11]. Currently, the constructi