# Electrochemical exfoliation of graphite

> A graphite electrode is made the anode in an aqueous salt solution such as ammonium sulfate. Under a DC bias, sulfate anions and water enter the graphite edges and the gases they produce force the layers apart, so few-layer graphene flakes detach into the electrolyte. The flakes are filtered, washed and re-dispersed.

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- Updated: 2026-10-14
- Category: Graphene synthesis
- Method: Electrochemical exfoliation, top-down
- Starting materials: Graphite foil, rod or compressed graphite powder (the anode)
- Product: Few-layer graphene flakes with little oxidation
- Typical size: Flakes of several to tens of micrometres, mostly 1–3 layers
- Key result: Good: mild oxidation (high C/O ratio), some defects
- Scalability: High: fast, cheap and run at room temperature
- Figure: 1920 × 1080 px, 95 editable layers (18 generated objects with settings)

## Steps

1. **Set up the cell**: Graphite anode and Pt counter electrode in an aqueous sulfate electrolyte, e.g. (NH₄)₂SO₄
2. **Apply a DC bias**: A few volts (5–10 V reported) drive anions and water into the graphite edges
3. **Gas evolution and expansion**: O₂ and SO₂ formed between the layers pry them apart
4. **Exfoliation**: Few-layer flakes detach and collect in the electrolyte
5. **Filter, wash and disperse**: Remove the salt, then re-disperse the flakes by brief sonication

## Strengths

- Fast, at room temperature and pressure
- Mild oxidation compared with Hummers-type routes
- Simple setup with cheap, non-toxic salts

## Limitations

- Flake thickness and size are not uniform
- The anode breaks apart as it expands, which can stop the process
- Some oxygen groups and defects remain

## Uses

- Conductive inks and coatings
- Polymer composites and strain sensors
- Battery and supercapacitor electrodes

## References

1. Achee et al., “High-yield scalable graphene nanosheet production from compressed graphite using electrochemical exfoliation”, Sci. Rep. 2018. https://doi.org/10.1038/s41598-018-32741-3 (primary)
2. Parvez et al., “Exfoliation of graphite into graphene in aqueous solutions of inorganic salts”, J. Am. Chem. Soc. 2014. https://doi.org/10.1021/ja5017156 (primary)
3. “Fabrication of graphene by electrochemical intercalation method and performance of graphene/PVA composites as stretchable strain sensor”, Arab. J. Sci. Eng.. https://doi.org/10.1007/s13369-020-04807-w (further reading)

Credit: Redrawn and simplified after Parvez et al., J. Am. Chem. Soc. 2014 (doi:10.1021/ja5017156) and Achee et al., Sci. Rep. 2018 (doi:10.1038/s41598-018-32741-3); bias voltages (5 and 10 V) as in doi:10.1007/s13369-020-04807-w.

## Questions

**What does the “Electrochemical exfoliation of graphite” template show?** A graphite electrode is made the anode in an aqueous salt solution such as ammonium sulfate. Under a DC bias, sulfate anions and water enter the graphite edges and the gases they produce force the layers apart, so few-layer graphene flakes detach into the electrolyte. The flakes are filtered, washed and re-dispersed.

**What are the steps shown in “Electrochemical exfoliation of graphite”?** 1. Set up the cell: Graphite anode and Pt counter electrode in an aqueous sulfate electrolyte, e.g. (NH₄)₂SO₄. 2. Apply a DC bias: A few volts (5–10 V reported) drive anions and water into the graphite edges. 3. Gas evolution and expansion: O₂ and SO₂ formed between the layers pry them apart. 4. Exfoliation: Few-layer flakes detach and collect in the electrolyte. 5. Filter, wash and disperse: Remove the salt, then re-disperse the flakes by brief sonication.

**What are the starting materials and the product?** Starting materials: Graphite foil, rod or compressed graphite powder (the anode). Product: Few-layer graphene flakes with little oxidation.

**Which papers is “Electrochemical exfoliation of graphite” based on?** Achee et al., “High-yield scalable graphene nanosheet production from compressed graphite using electrochemical exfoliation”, Sci. Rep. 2018 (doi:10.1038/s41598-018-32741-3); Parvez et al., “Exfoliation of graphite into graphene in aqueous solutions of inorganic salts”, J. Am. Chem. Soc. 2014 (doi:10.1021/ja5017156); “Fabrication of graphene by electrochemical intercalation method and performance of graphene/PVA composites as stretchable strain sensor”, Arab. J. Sci. Eng. (doi:10.1007/s13369-020-04807-w).

**Can I edit the “Electrochemical exfoliation of graphite” template?** Yes. Open it in the LabCanvas editor: all 95 layers are editable, including 18 generated objects (structures, plots, equipment) with their own settings. Change the text, colours and layout, then export PNG, TIFF, SVG or PDF.

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