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Converting CO2 to carbon at mild conditions

By Paul Grad |

An international research team led by RMIT University (Melbourne, Australia; www.rmit.edu.au) has developed a technique for efficiently converting CO2 to carbon. The team included researchers from the University of Münster (Germany), Nanjing University of Aeronautics and Astronautics (China), North Carolina State University (Raleigh), University of New South Wales (Sydney, Australia), the University of Wollongong (Wollongong, Australia), and Monash University (Melbourne, Australia). The storage of CO2, either in its gaseous state or compressed into a liquid, has proved challenging and costly. Therefore, converting CO2 into a solid offers an attractive alternative method for safely and permanently removing CO2 from the atmosphere. To date, CO2 has only been converted into a solid at extremely high temperatures, making it industrially unviable. The team created a liquid metal electrocatalyst that contains metallic elemental cerium nanoparticles, which facilitate the reduction of CO2 to layered solid carbon, at a low onset potential of –310 mV. The formation of a cerium oxide catalyst at the liquid metal/electrolyte interface, together with cerium nanoparticles, promoted the room-temperature reduction of CO2. The electrode proved…
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