Electrochemically Derived Monolayer Graphene with CVD-Comparable Optoelectrical Properties and High Capacitive Performance
Harnessing the exceptional properties of monolayer graphene (MG) requires scalable,
cost-effective synthesis free from multi-layer graphene. While liquid-phase
methods are inexpensive, they often produce oxidized, layer-polydisperse graphene
with small flakes. Here, we present a liquid-phase method that synthesizes layermonodisperse
MG via engineered electrochemical exfoliation. Using a 98% H2SO4
electrolyte, graphite was intercalated to stage-I Graphite bisulfate (GB) and subsequently
exfoliated, followed by tuned ultrasonic agitation in NMP, achieving a high
MG yield of ∼ 93.3%. This process results in large MG flakes (∼ 136 μm2) with
low defect density (ID/IG < 0.1) and oxygen content of 2.8%. The MG also exhibits
outstanding optoelectrical properties, including ∼ 96.86% transparency and
high conductivity (∼ 2.45 ×106 S m-1), comparable to CVD-synthesized graphene.
Additionally, MG films demonstrate superior supercapacitive energy storage with a
specific capacitance of ∼ 1363 F g-1 at 1 A g-1, surpassing thicker graphene and
reduced graphene oxide films.
Authors
- Anupam Shukla (ORCID: https://orcid.org/0000-0002-9155-7853)
- Isha Atrey (ORCID: https://orcid.org/0009-0004-3624-0927)
Institutions
- Indian Institute of Technology Delhi (IN)
Publication Details
- Journal
- Nanotechnology
- Published
- 2026-08-03
- DOI
- https://doi.org/10.1088/1361-6528/ae93c0
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Department of Science and Technology, Ministry of Science and Technology, India
- Science and Engineering Research Board