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High-yield scalable graphene nanosheet production from compressed graphite using electrochemical exfoliation.


ABSTRACT: Electrochemical exfoliation is a promising bulk method for producing graphene from graphite; in this method, an applied voltage drives ionic species to intercalate into graphite where they form gaseous species that expand and exfoliate individual graphene sheets. However, a number of obstacles have prevented this approach from becoming a feasible production route; the disintegration of the graphite electrode as the method progresses is the chief difficulty. Here we show that if graphite powders are contained and compressed within a permeable and expandable containment system, the graphite powders can be continuously intercalated, expanded, and exfoliated to produce graphene. Our data indicate both high yield (65%) and extraordinarily large lateral size (>30 ?m) in the as-produced graphene. We also show that this process is scalable and that graphene yield efficiency depends solely on reactor geometry, graphite compression, and electrolyte transport.

SUBMITTER: Achee TC 

PROVIDER: S-EPMC6162260 | biostudies-other | 2018 Sep

REPOSITORIES: biostudies-other

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High-yield scalable graphene nanosheet production from compressed graphite using electrochemical exfoliation.

Achee Thomas C TC   Sun Wanmei W   Hope Joshua T JT   Quitzau Samuel G SG   Sweeney Charles Brandon CB   Shah Smit A SA   Habib Touseef T   Green Micah J MJ  

Scientific reports 20180928 1


Electrochemical exfoliation is a promising bulk method for producing graphene from graphite; in this method, an applied voltage drives ionic species to intercalate into graphite where they form gaseous species that expand and exfoliate individual graphene sheets. However, a number of obstacles have prevented this approach from becoming a feasible production route; the disintegration of the graphite electrode as the method progresses is the chief difficulty. Here we show that if graphite powders  ...[more]

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