Patent
US 8,834,701Electrochemical process for the synthesis of graphene from carbon nanotubes
Dhanraj Bhagwanrao Shinde
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 8,834,701Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
c.) Amendment to the Claims 1. An electrochemical process for the synthesis of graphene comprising the steps of: i. dispersing carbon nanotubes (CNTs) in ethanol by sonication followed by deposition onto a conducting substrate by dip coating, spin coating or brush coating, said CNTs being selected from the group consisting of single walled, double walled and multi walled CNTs; ii. oxidizing CNTs as obtained in step (i) selectively in a conducting solution by applying a positive potential for a period in the range of 4 to 12 hrs to obtain CNT oxide; and iii. reducing CNT oxide as obtained in step (ii) completely by applying a negative potential for a period in the range of 4 to 12 hrs to obtain graphene with a yield of 6 to 7 %.
The electrochemical process as claimed in claim 1, wherein the conducting substrate tts- ed is selected from the group consisting of glassy C, Pt e+ and Au.
The electrochemical process as claimed in claim 1, wherein the conducting solution us ed is polar or non polar.
The electrochemical process as claimed in claim 1, wherein the graphene obtained in step (iii) is in the form of ribbons, layers, scrolls, flowers and urchins with less defects and more uniform layer thickness.
canceled
The electrochemical process as claimed in SVG 13822402.07-22-2014.HXXMPCICPXXIFW3.CLM.1.svg 0.16 5.94 Black and white are in the r-an ge ranges of 0.5 to 0.8V and -0.5 to -0.7 V respectively. -8-
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials2 process steps
10 mg of MWCNT (99% pure, Aldrich) was dispersed in 20 ml ethanol with 5 µl of 0.10% Nafion (binder) by sonication for 15 minutes. A 5 µl portion was deposited onto a pre-polished glassy carbon electrode (GCE) and dried in inert atmosphere for 1 hour. Electrochemical oxidation was performed in a three-electrode system (Pt counter electrode, saturated Mercury Mercurous Sulphate reference electrode) at a fixed positive potential of 0.6 V for 4, 8, or 12 hours in 0.5 M H₂SO4. CNT oxide was then reduced at fixed negative potentials of -0.5, -0.6, and -0.7 V for 4, 8, or 12 hours to yield few-layer graphene ribbons.
Materials described outside the worked examples.
graphene
glassy carbon
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Voltage | 0.5–0.8 V | — |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,834,701Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
c.) Amendment to the Claims 1. An electrochemical process for the synthesis of graphene comprising the steps of: i. dispersing carbon nanotubes (CNTs) in ethanol by sonication followed by deposition onto a conducting substrate by dip coating, spin coating or brush coating, said CNTs being selected from the group consisting of single walled, double walled and multi walled CNTs; ii. oxidizing CNTs as obtained in step (i) selectively in a conducting solution by applying a positive potential for a period in the range of 4 to 12 hrs to obtain CNT oxide; and iii. reducing CNT oxide as obtained in step (ii) completely by applying a negative potential for a period in the range of 4 to 12 hrs to obtain graphene with a yield of 6 to 7 %.
The electrochemical process as claimed in claim 1, wherein the conducting substrate tts- ed is selected from the group consisting of glassy C, Pt e+ and Au.
The electrochemical process as claimed in claim 1, wherein the conducting solution us ed is polar or non polar.
The electrochemical process as claimed in claim 1, wherein the graphene obtained in step (iii) is in the form of ribbons, layers, scrolls, flowers and urchins with less defects and more uniform layer thickness.
canceled
The electrochemical process as claimed in SVG 13822402.07-22-2014.HXXMPCICPXXIFW3.CLM.1.svg 0.16 5.94 Black and white are in the r-an ge ranges of 0.5 to 0.8V and -0.5 to -0.7 V respectively. -8-
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials2 process steps
10 mg of MWCNT (99% pure, Aldrich) was dispersed in 20 ml ethanol with 5 µl of 0.10% Nafion (binder) by sonication for 15 minutes. A 5 µl portion was deposited onto a pre-polished glassy carbon electrode (GCE) and dried in inert atmosphere for 1 hour. Electrochemical oxidation was performed in a three-electrode system (Pt counter electrode, saturated Mercury Mercurous Sulphate reference electrode) at a fixed positive potential of 0.6 V for 4, 8, or 12 hours in 0.5 M H₂SO4. CNT oxide was then reduced at fixed negative potentials of -0.5, -0.6, and -0.7 V for 4, 8, or 12 hours to yield few-layer graphene ribbons.
Materials described outside the worked examples.
graphene
glassy carbon
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Voltage | 0.5–0.8 V | — |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,834,701Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
c.) Amendment to the Claims 1. An electrochemical process for the synthesis of graphene comprising the steps of: i. dispersing carbon nanotubes (CNTs) in ethanol by sonication followed by deposition onto a conducting substrate by dip coating, spin coating or brush coating, said CNTs being selected from the group consisting of single walled, double walled and multi walled CNTs; ii. oxidizing CNTs as obtained in step (i) selectively in a conducting solution by applying a positive potential for a period in the range of 4 to 12 hrs to obtain CNT oxide; and iii. reducing CNT oxide as obtained in step (ii) completely by applying a negative potential for a period in the range of 4 to 12 hrs to obtain graphene with a yield of 6 to 7 %.
The electrochemical process as claimed in claim 1, wherein the conducting substrate tts- ed is selected from the group consisting of glassy C, Pt e+ and Au.
The electrochemical process as claimed in claim 1, wherein the conducting solution us ed is polar or non polar.
The electrochemical process as claimed in claim 1, wherein the graphene obtained in step (iii) is in the form of ribbons, layers, scrolls, flowers and urchins with less defects and more uniform layer thickness.
canceled
The electrochemical process as claimed in SVG 13822402.07-22-2014.HXXMPCICPXXIFW3.CLM.1.svg 0.16 5.94 Black and white are in the r-an ge ranges of 0.5 to 0.8V and -0.5 to -0.7 V respectively. -8-
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials2 process steps
10 mg of MWCNT (99% pure, Aldrich) was dispersed in 20 ml ethanol with 5 µl of 0.10% Nafion (binder) by sonication for 15 minutes. A 5 µl portion was deposited onto a pre-polished glassy carbon electrode (GCE) and dried in inert atmosphere for 1 hour. Electrochemical oxidation was performed in a three-electrode system (Pt counter electrode, saturated Mercury Mercurous Sulphate reference electrode) at a fixed positive potential of 0.6 V for 4, 8, or 12 hours in 0.5 M H₂SO4. CNT oxide was then reduced at fixed negative potentials of -0.5, -0.6, and -0.7 V for 4, 8, or 12 hours to yield few-layer graphene ribbons.
Materials described outside the worked examples.
graphene
glassy carbon
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Voltage | 0.5–0.8 V | — |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,834,701Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
c.) Amendment to the Claims 1. An electrochemical process for the synthesis of graphene comprising the steps of: i. dispersing carbon nanotubes (CNTs) in ethanol by sonication followed by deposition onto a conducting substrate by dip coating, spin coating or brush coating, said CNTs being selected from the group consisting of single walled, double walled and multi walled CNTs; ii. oxidizing CNTs as obtained in step (i) selectively in a conducting solution by applying a positive potential for a period in the range of 4 to 12 hrs to obtain CNT oxide; and iii. reducing CNT oxide as obtained in step (ii) completely by applying a negative potential for a period in the range of 4 to 12 hrs to obtain graphene with a yield of 6 to 7 %.
The electrochemical process as claimed in claim 1, wherein the conducting substrate tts- ed is selected from the group consisting of glassy C, Pt e+ and Au.
The electrochemical process as claimed in claim 1, wherein the conducting solution us ed is polar or non polar.
The electrochemical process as claimed in claim 1, wherein the graphene obtained in step (iii) is in the form of ribbons, layers, scrolls, flowers and urchins with less defects and more uniform layer thickness.
canceled
The electrochemical process as claimed in SVG 13822402.07-22-2014.HXXMPCICPXXIFW3.CLM.1.svg 0.16 5.94 Black and white are in the r-an ge ranges of 0.5 to 0.8V and -0.5 to -0.7 V respectively. -8-
Embodiments described in the patent, grouped by the materials and process steps they use.
5 materials2 process steps
10 mg of MWCNT (99% pure, Aldrich) was dispersed in 20 ml ethanol with 5 µl of 0.10% Nafion (binder) by sonication for 15 minutes. A 5 µl portion was deposited onto a pre-polished glassy carbon electrode (GCE) and dried in inert atmosphere for 1 hour. Electrochemical oxidation was performed in a three-electrode system (Pt counter electrode, saturated Mercury Mercurous Sulphate reference electrode) at a fixed positive potential of 0.6 V for 4, 8, or 12 hours in 0.5 M H₂SO4. CNT oxide was then reduced at fixed negative potentials of -0.5, -0.6, and -0.7 V for 4, 8, or 12 hours to yield few-layer graphene ribbons.
Materials described outside the worked examples.
graphene
glassy carbon
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Voltage | 0.5–0.8 V | — |
Related documents with shared materials, methods, properties, or citations.
platinum
Pt
gold
Au
potassium hydroxide
KOH
acetonitrile with lithium perchlorate
ionic liquids
polymer electrolyte
LiAsF₆
LiPF₆
LiBF₄
platinum
Pt
gold
Au
potassium hydroxide
KOH
acetonitrile with lithium perchlorate
ionic liquids
polymer electrolyte
LiAsF₆
LiPF₆
LiBF₄
platinum
Pt
gold
Au
potassium hydroxide
KOH
acetonitrile with lithium perchlorate
ionic liquids
polymer electrolyte
LiAsF₆
LiPF₆
LiBF₄
platinum
Pt
gold
Au
potassium hydroxide
KOH
acetonitrile with lithium perchlorate
ionic liquids
polymer electrolyte
LiAsF₆
LiPF₆
LiBF₄