2D Janus ZrSSe/SnSSe Heterostructure: A Promising Candidate for Photocatalytic Water Splitting.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials, especially Janus transition metal dichalcogenides (TMDs), are of significant interest for optoelectronics and photovoltaics due to unique properties from broken symmetry.
• Janus TMDs offer potential in photocatalysis, driving research into novel heterostructures.

Purpose of the Study:

• To investigate the stability, electronic, and optical properties of ZrSSe, SnSSe monolayers, and the ZrSSe/SnSSe heterostructure.
• To explore the potential of the Janus ZrSSe/SnSSe heterostructure in photo/electrocatalysis for applications like water splitting.

Main Methods:

• First-principles calculations were employed to analyze the structural, mechanical, electronic, and optical characteristics.
• The HSE06 functional was used to determine the electronic band structure and band alignment.

Main Results:

• The Janus ZrSSe/SnSSe heterostructure demonstrated structural and mechanical stability.
• An indirect band gap of 1.20 eV and a type-II band alignment were observed for the ZrSSe/SnSSe heterostructure.
• Spontaneous activation of the oxygen evolution reaction (OER) in acidic media under light irradiation (U = 1.82 eV) was predicted.
• Strong light absorption was noted across visible and ultraviolet regions.

Conclusions:

• The Janus ZrSSe/SnSSe heterostructure is a stable material with favorable electronic and optical properties.
• Its potential for photocatalysis, particularly in water splitting and ROS generation, is significant.
• These findings support the application of ZrSSe/SnSSe-based materials in advanced optoelectronic devices.