▎ 摘　　要

It has been a long-standing challenge to prepare graphene with green and efficient synthesis technique. In this work, we report a simple and cost-effective approach to fabricate few-layer graphene through the reaction between Mg melt and CO2 gas at conventional melting conditions. The results indicated that the as-fabricated graphene has high graphitization degree and small thickness. In addition, the reaction temperature has great impact on the quality of the as-fabricated graphene, and they possess relatively the best quality when prepared at 750 degrees C. When serving as lithium storage materials, the as-fabricated graphene exhibits excellent rate capability and cycling performance with a reversible capacity of 130 m Ah g(-1) after 1000 cycles at a current density of 1.0 A g(-1). The porous graphene produced by removing nano-sized MgO particles contains numerous defects and C=O groups, which could provide more adsorption sites for lithium storage. This study opens up an avenue to synthesize graphene from greenhouse gases. The as fabricated graphene possesses great potential employed as lithium storage materials. Data availability: The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. (C) 2022 Elsevier B.V. All rights reserved.