It is well-established that the accumulation of greenhouse gases, like carbon dioxide (CO2), in the atmosphere contributes to climate change.
It is well-established that the accumulation of greenhouse gases, like carbon dioxide (CO2), in the atmosphere contributes to climate change. Therefore, CO2 capture and recycling are vital for mitigating detrimental environmental effects and addressing the climate crisis. Recently, researchers from Japan designed a polymer-coated metal catalyst that accelerates CO2 conversion and offers green energy insights.
In a study published in ACS Catalysis, researchers from the University of Tsukuba describe porous tin (Sn) catalysts coated with polyethylene glycol (PEG) and show how this polymer facilitates CO2 transformation into a useful carbon-based fuel.
Various polymers can capture CO2 molecules, and Sn catalysts are known to reduce CO2 to other molecules, like formate (HCOO-), which can be reused to power fuel cells.
"We were interested in combining these capabilities into a single catalytic system that could scrub CO2 from its surroundings and recycle it into formate," says research group leader, Professor Yoshikazu Ito. "However, it's difficult to obtain only the desired product, formate, at a high production rate and in high yield, so we had to fine-tune the catalyst design." The formate production rate of PEG-coated Sn was 24 times higher than that of a conventional Sn plate electrode, and no byproducts were detected (>99% yield of formate). To understand this enhanced CO2-reduction reaction, the researchers fabricated an Sn catalyst coated with another CO2-capturing polymer (polyethyleneimine; PEI) whose structure interacts differently with incoming CO2. The PEG-coated Sn still outperformed the PEI-coated Sn, and considering the chemical characteristics of these polymers, the authors proposed that PEI held the CO2 molecules too tightly, whereas PEG struck a key balance in capturing and then releasing CO2 to the catalytic Sn core.
Read more at University of Tsukuba
