All Solution-Processed, Hybrid Organic-Inorganic Photocathode for Hydrogen Evolution.

Area of Science:

• Materials Science
• Renewable Energy
• Electrochemistry

Background:

• Efficient solar energy conversion to chemical fuels is crucial for sustainability.
• Photoelectrochemical water-splitting offers a promising route for solar fuel production.
• Scalable fabrication of efficient photoelectrodes remains a challenge.

Purpose of the Study:

• To develop an all solution-processed method for fabricating hybrid organic/inorganic photocathodes.
• To achieve high photoelectrochemical performance for hydrogen evolution.
• To demonstrate a scalable and cost-effective approach for solar-to-hydrogen conversion.

Main Methods:

• Fabrication of hybrid photocathodes using sequential spin coating of inorganic materials, charge-selective contacts, organic semiconductors, and earth-abundant catalysts.
• Characterization of photoelectrochemical performance, including onset potential, photocurrent density, and faradaic efficiency.

Main Results:

• Achieved state-of-the-art photoelectrochemical parameters.
• High onset potential (+0.602 V vs RHE) and maximum power point (+0.222 V vs RHE).
• Photocurrent density of 5.25 mA/cm², IPCE >35%, and 100% faradaic efficiency for H₂ production.

Conclusions:

• The all solution-processed hybrid photocathodes demonstrate significant potential for scalable and low-cost solar-to-hydrogen conversion.
• This technology meets feasibility requirements for large-area, plant-scale applications.
• Represents a viable advancement in sustainable hydrogen fuel production.