Patent
US 9,096,938Graphite Oxide and/or Graphene Preparation Method
Kung-Hwa Wei
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 9,096,938Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphite oxide and/or graphene preparation method, comprising: providing a plasma electrolytic apparatus, wherein a basic electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; and providing a cathodic current so as to initiate a cathodic plasma e°eelyti 4ie exfoliation process at the surface of graphite electrode that have been in touch with the electrolyte to obtain graphite oxide and/or graphene.
The preparation method as claimed in claim 1, wherein the graphite electrode includes natural graphite, compressed graphite, partially oxidized graphite or recycled graphite.
The preparation method as claimed in claim 1, wherein one end of the graphite electrode is barely above the surface of the electrolytic solution.
The preparation method as claimed in claim 1, wherein the plasma eleetiely4e exfoliation proce ss-eaeiefi occurs at or near the surface of graphite electrode.
The preparation method as claimed in claim 1, wherein a surface area of the anode that is submerged in the electrolyte is larger than a surface area of the cathode that is contact with the electrolyte for the plasma electrolytic apparatus.
The preparation method as claimed in claim 1, wherein a surface area of the anode of the plasma electrolytic apparatus is 11 times larger than a surface area of the cathode.
The preparation method as claimed in claim 1, wherein the anode of the plasma electrolytic apparatus is not made of aluminum, magnesium, or titanium.
The preparation method as claimed in claim 1, wherein an anode of the plasma electrolytic apparatus is immersed into the electrolytic solution completely during the plasma e leetdeyPi e exfoliation process.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-17.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-14.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises ammonium ion.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises carbonate and ammonia.
The preparation method as claimed in claim 1, wherein an ultrasonic vibration is simultaneously subjected in the plasma elee-ielyt ie exfoliation process i-eae4+e.
A graphene preparation method comprises: providing a plasma electrolytic apparatus, wherein an electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; providing a cathodic current so as to initiate a cathodic plasma e°ee-fey4ie exfoliation process at the graphite electrode to obtain graphite oxide and/or graphene; and exfoliating and reducing the graphite oxide to obtain graphene. Page 4 of 11
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials1 process step
Plasma electrolytic graphite oxide (PEGO) and hydrothermally processed PEGO (HPEGO) are prepared using a plasma electrolytic apparatus. The electrolytic solution comprises KOH (10%, 180 mL) and (NH₄)2SO₄ (5%, 20 mL). A graphite electrode is configured as cathode and subjected to cathodic plasma electrolytic exfoliation to yield graphite oxide and/or graphene.
Materials described outside the worked examples.
ammonium ion
NH₄+
carbonate
CO32-
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | 60–90 °C | — |
Thickness |
Patent
Atlas literature
Patent
US 9,096,938Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphite oxide and/or graphene preparation method, comprising: providing a plasma electrolytic apparatus, wherein a basic electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; and providing a cathodic current so as to initiate a cathodic plasma e°eelyti 4ie exfoliation process at the surface of graphite electrode that have been in touch with the electrolyte to obtain graphite oxide and/or graphene.
The preparation method as claimed in claim 1, wherein the graphite electrode includes natural graphite, compressed graphite, partially oxidized graphite or recycled graphite.
The preparation method as claimed in claim 1, wherein one end of the graphite electrode is barely above the surface of the electrolytic solution.
The preparation method as claimed in claim 1, wherein the plasma eleetiely4e exfoliation proce ss-eaeiefi occurs at or near the surface of graphite electrode.
The preparation method as claimed in claim 1, wherein a surface area of the anode that is submerged in the electrolyte is larger than a surface area of the cathode that is contact with the electrolyte for the plasma electrolytic apparatus.
The preparation method as claimed in claim 1, wherein a surface area of the anode of the plasma electrolytic apparatus is 11 times larger than a surface area of the cathode.
The preparation method as claimed in claim 1, wherein the anode of the plasma electrolytic apparatus is not made of aluminum, magnesium, or titanium.
The preparation method as claimed in claim 1, wherein an anode of the plasma electrolytic apparatus is immersed into the electrolytic solution completely during the plasma e leetdeyPi e exfoliation process.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-17.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-14.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises ammonium ion.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises carbonate and ammonia.
The preparation method as claimed in claim 1, wherein an ultrasonic vibration is simultaneously subjected in the plasma elee-ielyt ie exfoliation process i-eae4+e.
A graphene preparation method comprises: providing a plasma electrolytic apparatus, wherein an electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; providing a cathodic current so as to initiate a cathodic plasma e°ee-fey4ie exfoliation process at the graphite electrode to obtain graphite oxide and/or graphene; and exfoliating and reducing the graphite oxide to obtain graphene. Page 4 of 11
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials1 process step
Plasma electrolytic graphite oxide (PEGO) and hydrothermally processed PEGO (HPEGO) are prepared using a plasma electrolytic apparatus. The electrolytic solution comprises KOH (10%, 180 mL) and (NH₄)2SO₄ (5%, 20 mL). A graphite electrode is configured as cathode and subjected to cathodic plasma electrolytic exfoliation to yield graphite oxide and/or graphene.
Materials described outside the worked examples.
ammonium ion
NH₄+
carbonate
CO32-
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | 60–90 °C | — |
Thickness |
Patent
Atlas literature
Patent
US 9,096,938Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphite oxide and/or graphene preparation method, comprising: providing a plasma electrolytic apparatus, wherein a basic electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; and providing a cathodic current so as to initiate a cathodic plasma e°eelyti 4ie exfoliation process at the surface of graphite electrode that have been in touch with the electrolyte to obtain graphite oxide and/or graphene.
The preparation method as claimed in claim 1, wherein the graphite electrode includes natural graphite, compressed graphite, partially oxidized graphite or recycled graphite.
The preparation method as claimed in claim 1, wherein one end of the graphite electrode is barely above the surface of the electrolytic solution.
The preparation method as claimed in claim 1, wherein the plasma eleetiely4e exfoliation proce ss-eaeiefi occurs at or near the surface of graphite electrode.
The preparation method as claimed in claim 1, wherein a surface area of the anode that is submerged in the electrolyte is larger than a surface area of the cathode that is contact with the electrolyte for the plasma electrolytic apparatus.
The preparation method as claimed in claim 1, wherein a surface area of the anode of the plasma electrolytic apparatus is 11 times larger than a surface area of the cathode.
The preparation method as claimed in claim 1, wherein the anode of the plasma electrolytic apparatus is not made of aluminum, magnesium, or titanium.
The preparation method as claimed in claim 1, wherein an anode of the plasma electrolytic apparatus is immersed into the electrolytic solution completely during the plasma e leetdeyPi e exfoliation process.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-17.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-14.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises ammonium ion.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises carbonate and ammonia.
The preparation method as claimed in claim 1, wherein an ultrasonic vibration is simultaneously subjected in the plasma elee-ielyt ie exfoliation process i-eae4+e.
A graphene preparation method comprises: providing a plasma electrolytic apparatus, wherein an electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; providing a cathodic current so as to initiate a cathodic plasma e°ee-fey4ie exfoliation process at the graphite electrode to obtain graphite oxide and/or graphene; and exfoliating and reducing the graphite oxide to obtain graphene. Page 4 of 11
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials1 process step
Plasma electrolytic graphite oxide (PEGO) and hydrothermally processed PEGO (HPEGO) are prepared using a plasma electrolytic apparatus. The electrolytic solution comprises KOH (10%, 180 mL) and (NH₄)2SO₄ (5%, 20 mL). A graphite electrode is configured as cathode and subjected to cathodic plasma electrolytic exfoliation to yield graphite oxide and/or graphene.
Materials described outside the worked examples.
ammonium ion
NH₄+
carbonate
CO32-
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | 60–90 °C | — |
Thickness |
Patent
Atlas literature
Patent
US 9,096,938Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphite oxide and/or graphene preparation method, comprising: providing a plasma electrolytic apparatus, wherein a basic electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; and providing a cathodic current so as to initiate a cathodic plasma e°eelyti 4ie exfoliation process at the surface of graphite electrode that have been in touch with the electrolyte to obtain graphite oxide and/or graphene.
The preparation method as claimed in claim 1, wherein the graphite electrode includes natural graphite, compressed graphite, partially oxidized graphite or recycled graphite.
The preparation method as claimed in claim 1, wherein one end of the graphite electrode is barely above the surface of the electrolytic solution.
The preparation method as claimed in claim 1, wherein the plasma eleetiely4e exfoliation proce ss-eaeiefi occurs at or near the surface of graphite electrode.
The preparation method as claimed in claim 1, wherein a surface area of the anode that is submerged in the electrolyte is larger than a surface area of the cathode that is contact with the electrolyte for the plasma electrolytic apparatus.
The preparation method as claimed in claim 1, wherein a surface area of the anode of the plasma electrolytic apparatus is 11 times larger than a surface area of the cathode.
The preparation method as claimed in claim 1, wherein the anode of the plasma electrolytic apparatus is not made of aluminum, magnesium, or titanium.
The preparation method as claimed in claim 1, wherein an anode of the plasma electrolytic apparatus is immersed into the electrolytic solution completely during the plasma e leetdeyPi e exfoliation process.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-17.
The preparation method as claimed in claim 1, wherein the pH of the electrolytic solution ranges from 11-14.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises ammonium ion.
The preparation method as claimed in claim 1, wherein the electrolytic solution comprises carbonate and ammonia.
The preparation method as claimed in claim 1, wherein an ultrasonic vibration is simultaneously subjected in the plasma elee-ielyt ie exfoliation process i-eae4+e.
A graphene preparation method comprises: providing a plasma electrolytic apparatus, wherein an electrolytic solution is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; providing a cathodic current so as to initiate a cathodic plasma e°ee-fey4ie exfoliation process at the graphite electrode to obtain graphite oxide and/or graphene; and exfoliating and reducing the graphite oxide to obtain graphene. Page 4 of 11
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials1 process step
Plasma electrolytic graphite oxide (PEGO) and hydrothermally processed PEGO (HPEGO) are prepared using a plasma electrolytic apparatus. The electrolytic solution comprises KOH (10%, 180 mL) and (NH₄)2SO₄ (5%, 20 mL). A graphite electrode is configured as cathode and subjected to cathodic plasma electrolytic exfoliation to yield graphite oxide and/or graphene.
Materials described outside the worked examples.
ammonium ion
NH₄+
carbonate
CO32-
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | 60–90 °C | — |
Thickness |
ammonia
NH₃
| 0.5–5 mm |
| — |
Temperature | 70–80 °C | — |
Thickness | 10–50 nm | — |
Thickness | 10–30 nm | — |
Voltage | 10–70 V | — |
ammonia
NH₃
| 0.5–5 mm |
| — |
Temperature | 70–80 °C | — |
Thickness | 10–50 nm | — |
Thickness | 10–30 nm | — |
Voltage | 10–70 V | — |
ammonia
NH₃
| 0.5–5 mm |
| — |
Temperature | 70–80 °C | — |
Thickness | 10–50 nm | — |
Thickness | 10–30 nm | — |
Voltage | 10–70 V | — |
ammonia
NH₃
| 0.5–5 mm |
| — |
Temperature | 70–80 °C | — |
Thickness | 10–50 nm | — |
Thickness | 10–30 nm | — |
Voltage | 10–70 V | — |