Novel Photocatalyst Sheet Helps Curtail the Rise of Atmospheric Carbon Dioxide

Curtailing CO₂

The project has set the objective of curtailing atmospheric CO₂ levels and helping secure all-important green energy supplies to combat the current energy crisis. Published in the journal Nature Catalysis, the team addresses the climate and energy challenges we face today.

We need to develop new technologies to address these grand challenges without further polluting the planet we live on.

Dr. Shafeer Kalathil, Vice Chancellor’s Senior Fellow at Northumbria University

The developed technology is made up of a bio-abiotic hybrid system and non-photosynthetic, CO2-fixing cetogenic bacterium Sporomusa ovata, cultivated at scale using a cost-effective photocatalyst sheet comprised of a pair of particulate semiconductors.

As an interdisciplinary field of study, the technology plays to the strengths of microbes, synthetic materials and analytical techniques and brings them together for chemical transformation, offering a platform to create high-value and scalable eco-friendly fuels and chemicals. 

The advantages this brings include showing scientists across different disciplines how to collaborate and help tackle one of the most important issues of our time and demonstrating how semi-biological approaches can provide a promising strategy for cleanly fixing CO₂ and sustainably closing the carbon cycle.

How it works

The biohybrid system works by effectively producing acetate (CH₃COO^–) and oxygen (O₂) utilizing only CO₂, water, and sunlight which helps to realize a solar-to-acetate conversion efficiency of 0.7% at ambient conditions (298 K, 1 atm).

The photocatalyst sheet used in the system is able to oxidize water to O₂ and generate electrons and hydrogen (H₂), which are then delivered to the Sporomusa ovata bacteria for the selective synthesis of acetate (CH3OO^–) from CO₂.

To prove effective in a closed carbon cycle, the solar-generated acetate was directly applied and used as feedstock in a bioelectrochemical system for the sustainable generation of electricity. In other words, the system can cleanly convert carbon dioxide into a single multicarbon product.

Increased atmospheric carbon dioxide as a result of anthropogenic factors has been a topic of concern in recent years, which brought about the Paris Agreement in 2015 as well as new, ambitious targets to reduce emissions that are expected to be in place by 2030, which align with reaching net zero by 2050.

This research demonstrates how developing biohybrid systems, such as the novel photocatalyst sheet, could help curtail the rise of atmospheric carbon dioxide and be another tool that could help achieve climate goals and move away from our reliance on fossil fuels.

References and Further Reading

Wang, Q., Kalathil, S., Pornrungroj, C., Sahm, C. and Reisner, E., (2022) Bacteria–photocatalyst sheet for sustainable carbon dioxide utilization. Nature Catalysis, [online] 5(7), pp.633-641. Available at: https://www.nature.com/articles/s41929-022-00817-z

Northumbria.ac.uk. (2022.) New technology can help combat climate crisis. [online] Available at: https://www.northumbria.ac.uk/about-us/news-events/news/new-technology-can-help-combat-climate-crisis/

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