Electrolytic synthesis of carbon from the captured CO2 in molten LiCl–KCl–CaCO3: Critical roles of electrode potential and temperature for hollow structure and lithium storage performance

摘要: Abstract In the present study, CaCO 3 -containing molten LiCl–KCl under CO 2 atmosphere was investigated as electrolyte for preparation of electrolytic carbon. Varying electrode potential and electrolysis temperature can manipulate kinetics electro-deposition reaction carbon, thereby allowing formation carbon products with different morphologies. At 450 °C, high yields micron-sized hollow spheres (HCSs) ultrathin sheets were obtained 2.8 3.5 V cell voltages, respectively. higher temperatures (550 650 °C) content decreased, various materials, such quasi–spherical particles, coral–like nanofibers, could be observed. Micron-sized HCSs only a moderate rate (2.8 V 450 °C), which allowed occurrence microbubble effect as-formed gas (one intermediates electro-reduction carbonate ions). The expansion shaped plastic sheets, resulting in well-developed HCSs. Among products, one deposited at 4.5 V 650 °C exhibited highest specific surface area more than 400 m  g −1 , while showed best performance lithium storage. study highlights importance manipulating working to value-added from captured salts.