Scientists Develop Semi-Artificial Leaf to Convert CO₂ into Valuable Chemicals

Researchers at the University of Cambridge made a new solar-powered device. They built it to act like a plant. The device takes in CO₂, water, and sunlight. It then changes these into clean fuels and useful chemical compounds. This work offers a way to move away from fossil fuels in making chemicals. It may change the global chemical industry.

Sustainable Chemistry Breakthrough

The chemical industry gives about 6% of the world’s carbon emissions. This happens because it relies on fossil fuels to make plastics, cosmetics, fertilizers, and more. The Cambridge team made a tool to “de-fossilize” this work. They use renewable resources to create important chemicals with less harm to the environment.

The Semi-Artificial Leaf: How It Works

The device mixes organic polymers that catch light with enzymes from bacteria. It works like photosynthesis by using sunlight to make a chemical called formate. Formate then feeds other chemical reactions. Key features are:

• Non-toxic, durable materials: The device skips harmful or unstable parts. It uses organic semiconductors to capture light.
• Continuous operation without external power: The system runs on its own.
• Selective enzyme action: Bacterial enzymes guide the conversion with care and speed.

Innovations to Maximize Stability and Efficiency

One hard problem was keeping enzymes stable. The team solved this by placing the carbonic anhydrase enzyme into a porous titania matrix. With this fix, the device works well in simple bicarbonate solutions. It avoids harmful additives that can stop enzymes from lasting.

The device showed:

• Near-perfect electron efficiency when making fuel.
• Over 24 hours of continuous operation, twice the life of old devices.
• High-yield and high-purity production of pharmaceutical compounds through a “domino” cascade reaction using formate.

Implications for Green Chemistry and Industry

Professor Erwin Reisner led the work. He sees a chance to build a circular, sustainable economy. This design can lower the chemical industry’s carbon footprint. The semi-artificial leaf may soon help produce green fuels and chemicals without toxic parts.

Publication and Support

This study appeared in Joule (DOI: 10.1016/j.joule.2025.102165). It earned support from agencies such as:

• Singapore Agency for Science, Technology and Research (A*STAR)
• European Research Council
• UK Research and Innovation (UKRI)

References:

Yeung, C.W.S., Liu, Y., Vahey, D.M., et al. (2025). Semi-artificial leaf interfacing organic semiconductors and enzymes for solar chemical synthesis. Joule. https://doi.org/10.1016/j.joule.2025.102165

This work marks a promising step toward green chemical production. The device uses organic, non-toxic materials and runs on sunlight and CO₂. It is a key move in lowering industrial carbon emissions and cutting our reliance on fossil fuels.

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