Positioning hydrogen reaction sites by constructing CdS/CoNiMoS₄ heterojunctions for efficient photocatalytic...

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Hydrogen is a promising clean fuel due to its high energy density, offering a solution to fossil fuel dependency and pollution.
• Transition metal sulfides (TMSs) are explored as alternatives to noble metals in catalysis, but their practical efficacy remains limited.
• Developing efficient photocatalysts is crucial for sustainable hydrogen production.

Purpose of the Study:

• To develop a facile and general strategy for fabricating heterojunctions for enhanced photocatalytic activity.
• To create a dual-function photocatalyst combining CdS nanorods and a multimetallic transition metal sulfide (CoNiMoS4).
• To improve visible light absorption and charge transfer efficiency for hydrogen generation.

Main Methods:

• Fabrication of CdS nanorods and their integration with multimetallic CoNiMoS4 to form CdS/CoNiMoS4 heterojunctions.
• Characterization of the synthesized heterojunctions for their structural and optical properties.
• Evaluation of photocatalytic performance for hydrogen production under visible light irradiation.

Main Results:

• The CdS/CoNiMoS4 heterojunction demonstrated enhanced visible light absorption and efficient charge transfer.
• The photocatalyst achieved a hydrogen production rate of 31.9 mmol g⁻¹ h⁻¹.
• The CdS/CoNiMoS4 nanostructures exhibited excellent stability, maintaining performance for over 25 hours.

Conclusions:

• The CdS/CoNiMoS4 heterojunction is an effective dual-function photocatalyst for hydrogen production.
• This facile synthesis approach provides a new strategy for creating diverse heterojunctions using Earth-abundant multimetallic components.
• The developed heterojunctions show potential for broader applications in catalysis and renewable energy.