▎ 摘　　要

The performance of graphene, and a few selected derivatives, was investigated as a negative electrode material in sodium- and lithium-ion batteries. Hydrogenated graphene shows significant improvement in battery performance compared with as-prepared graphene, with reversible capacities of 488mAhg(-1) for lithium-ion batteries after 50cycles and 491mAhg(-1) for sodium-ion batteries after 20cycles. Notably, high rates of 1Ag(-1) for graphene and 5Ag(-1) for hydrogenated graphene indicate higher capacities in sodium-ion batteries than in lithium-ion batteries. Alternatively, nickel-nanoparticle-decorated graphene performed relatively poorly in lithium-ion batteries. However, in sodium-ion batteries they showed the highest reversible capacities of all studied batteries and graphene derivatives, with 826mAhg(-1) after 25cycles with approximate to 97% coulombic efficiency. Overall, minor modifications to graphene can dramatically improve electrochemical performance in both lithium-ion and sodium-ion batteries.