Electrochemical reduction of carbon dioxide is a crucial energy conversion protocol involving two significant processes: converting CO2, a greenhouse gas, into value-added products and reducing fossil fuel usage to produce fuels or chemical products. Moreover, the production of CO from the carbon dioxide reduction reaction is highly substantial since it is a twoproton/ electron reaction, and it also finds potential applications in chemical, metallurgical, and pharmaceutical industries. Among the various classes of electrocatalytic materials, single-atom catalysts have attracted great attention because of their high atom utilization. Here, we survey the recent research trends involved in the preparation of single atom-based electrocatalysts for the generation of carbon monoxide from the electroreduction of carbon dioxide.

For the commercialization of bipolar plates, several properties must be considered together. Electrical conductivity, corrosion resistance, contact resistance, mechanical strength, and light weight are essential evaluation factors, with corrosion resistance and durability being significant for unitized regenerative fuel cells (URFCs), which must operate in electrolysis and fuel cell mode. However, improving both properties is challenging, since corrosion resistance is largely inversely proportional to conductivity. In this study, to improve both properties together, composites composed of Pb and Zn with excellent conductivity and corrosion resistance were prepared with graphite powder and formed as a coating layer on the surface of 304 stainless steel (SS304) and evaluated for electrical conductivity and corrosion resistance. Among the ZnPb/C composites prepared at various ratios, Zn8Pb2/C exhibited the lowest transmittance resistance of 1.566 Ω, and improved electrical conductivity and durability compared to bare SS304.