High-yield synthesis of graphene quantum dots from spent graphite and application in hydrogel Zn batteries.

ABSTRACT: With the widespread development of electric vehicles, the number of spent lithium-ion batteries (LIBs) is steadily increasing each year. Meanwhile, the spent graphite anode, with low regeneration value and significant environmental impact, has emerged as an increasingly concerning issue. In this study, we adequately utilize the characteristic features of spent graphite, such as large interlayer spacing, abundant defects and a broken crystal structure resulting from repeated charge-discharge cycles, to fabricate uniform and single-layer graphene quantum dots (GQDs). Even more impressively, the yield of spent graphite derived GQDs is as high as 61.3%, which is much higher than that of GQDs from pristine graphite (11.8%). These GQDs with abundant hydrophilic functional groups are anchored ont

SUBMITTER: Luo D 

PROVIDER: S-EPMC12776529 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature