Development of Organic Semiconductor Photoelectrodes... Advancing the Era of Solar Hydrogen

Significant Improvement in the Stability of Organic Electrodes
More Efficient and Stable than Inorganic Photoelectrodes

Professor Jang Ji-wook (top left clockwise), Professor Yang Chang-deok, Researcher Kim Yoon-seo (first author), Researcher Yoo Je-min (first author)

[Asia Economy Reporter Junho Hwang] A technology capable of producing hydrogen from sunlight using organic semiconductors has been developed. Unlike conventional hydrogen production methods, it does not emit greenhouse gases, making it environmentally friendly. It is more efficient than inorganic semiconductor-based production methods and can be scaled up to large areas at a low cost, making it a promising technology to usher in an era of hydrogen production utilizing solar energy.

The research team led by Professors Jiwook Jang, Changdeok Yang, and Seungho Cho at Ulsan National Institute of Science and Technology (UNIST) developed a photoelectrode with both excellent performance and stability on the 9th by using a module system that effectively protects organic semiconductor materials from water. The related research results were published in Nature Communications on the 2nd.

Photoelectrode Composed of Organic Semiconductors... Twice the Efficiency of Inorganic Semiconductors

Schematic Diagram of Photoelectrode and Solar Hydrogen Production Using Organic Semiconductors

A photoelectrode is an electrode made of semiconductor materials that absorbs solar energy to generate charge carriers. These charge carriers react with water on the electrode surface to produce hydrogen and oxygen. The research team created a water-stable organic semiconductor photoelectrode using a module system composed of liquid metal (indium-potassium alloy), nickel foil, and a catalyst (nickel-iron bilayer hydroxide) grown directly on the nickel foil.

The nickel foil prevents direct contact between water and the organic semiconductor. The catalyst grown directly on the foil facilitates the overall reaction. The liquid metal between the nickel foil and the organic semiconductor blocks water while enabling smooth electron flow.

The research team stated, "This photoelectrode recorded a hydrogen production efficiency (half-cell efficiency) of 4.33%, more than twice that of conventional inorganic semiconductor photoelectrodes," adding, "Another advantage is that it allows large-area manufacturing at a low cost."

Accelerating the Commercialization of Solar Hydrogen Conversion Technology

Ulsan National Institute of Science and Technology

Professor Jiwook Jang from the Department of Energy Chemical Engineering said, "This study demonstrated the possibility of applying organic materials with high efficiency to photoelectrodes," and added, "It is expected to accelerate the commercialization of solar hydrogen conversion technology, which has faced limitations in efficiency."

Professor Changdeok Yang from the Department of Energy Chemical Engineering stated, "Unlike inorganic semiconductors, organic semiconductors can form countless combinations, allowing continuous discovery of new organic semiconductor materials with higher efficiency," and added, "Therefore, further performance improvements are anticipated."

Professor Seungho Cho from the Department of New Materials Engineering explained, "The advantage of the developed system is that it functions as a single module where the catalyst grown on the nickel foil or the type of organic semiconductor can be replaced," and added, "We are currently continuing research on new catalysts that assist charge transfer."

This content was produced with the assistance of AI translation services.