Great strides for carbon capture using earth-abundant elements as photocatalytic system

Researchers at Tokyo Tech have designed a CO₂ reduction method based only on commonly occurring elements. Achieving a 57% overall quantum yield of CO₂ reduction products, it is the highest performing system of its kind reported to date, raising prospects for cost-effective carbon capture solutions.

As global warming presents one of the biggest challenges to humanity in the 21st century, the quest to curb mounting CO₂ emissions is more pressing than ever.

In a study published in the Journal of the American Chemical Society, Osamu Ishitani and colleagues at Tokyo Tech and Japan's National Institute of Advanced Industrial Science and Technology report a photocatalytic¹ system that brings scientists closer to achieving artificial photosynthesis — the goal of creating a sustainable system similar to the way that plants convert CO₂ to useful energy by using earth abundant metals.

Although metal-complex photocatalytic systems have been reported for CO₂ reduction, many of them used noble- and/or rare-metal complexes. Compared to these approaches that utilize rare metals (such as ruthenium and rhenium), the use of earth abundant metals is "greener" and inexpensive, and has thus attracted much interest.

Their new process is made up of two components (see Figure 1): 1) a copper complex (CuPS) that behaves as a redox photosensitizer² and 2) a manganese-based catalyst, Mn(4OMe).

CuPS proved to be a stable and efficient redox photosensitizer, as decomposition was only 2% after 12 hours of irradiation. In addition, CuPS exhibited a much stronger reduction capability compared to other photosensitizers investigated to date.

The team reported that the total quantum yield of CO₂ reduction products was 57%, the turnover number based on the manganese catalyst was over 1,300 and the selectivity of CO₂ reduction was 95%.

In particular, the figure of 57% is remarkable, as the researchers comment: "To the best of our knowledge, this is the highest quantum yield for CO₂ reduction using abundant elements and the yield would be comparable to that obtained with rare metals."

The study highlights the way that incremental advances in chemistry may have a large impact on the wider goal of working towards a fossil-fuel-free future.

The research was supported by the Japan Science and Technology Agency's CREST program aimed at accelerating strategic innovation.

Observations of conversion of CO₂ to CO gas on photocatalytic reaction

Reference

Authors :	Hiroyuki Takeda, Hiroko Kamiyama, Kouhei Okamoto, Mina Irimajiri, Toshihide Mizutani, Kazuhide Koike*, Akiko Sekine and Osamu Ishitani
Title of original paper :	Highly Efficient and Robust Photocatalytic Systems for CO2 Reduction Consisting of a Cu（I） Photosensitizer and Mn（I） Catalysts
Journal :	Journal of the American Chemical Society (2018)
DOI :	10.1021/jacs.8b10619
Affiliations :	Department of Chemistry, School of Science, Tokyo Institute of Technology *National Institute of Advanced Industrial Science and Technology

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• Researcher Profile | Tokyo Tech STAR Search - Osamu Ishitani
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