PRIYANKA CHAKRABORTY, AMITY UNIVERSITY, KOLKATA
Carbon has always been applied in the fields such as metallurgy, environmental remediation, conversion, automotive industry, etc as it has extensive physicochemical properties. In this report, an efficient approach to making graphite from carbon dioxide at low temperatures in the absence of metal catalysts has been suggested. CO2 is converted into graphite flakes in a timescale by reacting with lithium-aluminum hydride and is heated to a temperature of 126 °C. Gaseous pressure-dependent kinetic for synthesizing graphite has shown to be the major cause for the synthesis of graphite without the metal catalysts. When serving as lithium in house materials, graphite micro flakes show marginal rate capability performance with a backdrop capacity of ~320 mAh g–1 (milliampere-hours per gram) per 1500 cycles. This particular study provides an idea to synthesize graphite from greenhouse gases at marginal temperatures by avoiding graphitization.
Graphite is removed from natural graphite mines or produced from carbon-containing samples. The production of natural graphite requires a multistep procedure that involves graphite mining and large-scale extraction and purification. Synthetic graphite, a type of crystalline carbon with microstructure and morphology, has a synthesis procedure that contains two sequential processes: carbonization of carbon samples and graphitization of acquired carbon. During the carbonization of carbon sample optimum quantities of greenhouse gas and hazardous gases (which are one of the main causes of global warming), are emitted into the atmosphere. Moreover, the metal catalysts are found to be difficult to distinguish from synthetic graphite.
In summary, the report has demonstrated an approach for the green synthesis of graphite from CO2 at considerably low temperatures. The graphite micro flakes are successfully acquired by reacting CO2 with LiAlH4 at a particular temperature range in the absence of transition metal catalysts. The kinetic barrier of the reaction is seen to be strongly dependent on gaseous backpressure( pressure difference between graphite and CO2), further demonstrating the association of amorphous carbon and graphite.
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Citation:Liang, C., Chen, Y., Wu, M. et al. Green synthesis of graphite from CO2 without graphitization process of amorphous carbon. Nat Commun 12, 119 (2021). https://doi.org/10.1038/s41467-020-20380-0
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