▎ 摘　　要

Strategies that improve the yield of graphene nanosheets in anodic exfoliation processes are desirable for the mass production of this material. Here, a simple pre-treatment of graphite foil with concentrated H2SO4 is demonstrated to be such an effective strategy, affording overall exfoliation yields up to 50 wt% under certain experimental conditions, compared with a baseline value of 10 wt% for untreated graphite. Filling of inner voids and interstices of the graphite foil with H2SO4 molecules was concluded to be responsible for the enhanced exfoliation performance. Additional approaches to further increase the anodic exfoliation yield are also proposed and discussed. (C) 2017 Elsevier Ltd. All rights reserved.