Supercapacitor configurations with graphene-based electrodes and/or peptide
One embodiment is an EDLC with a capacitor cell that includes two electrodes of opposite polarity aligned in parallel, and a peptide separator disposed between the electrodes. The separator may be a peptide coating on an electrode surface. Another embodiment is an electrode for an electrochemical energy storage device, such as an EDLC, the electrode including graphene and coated with peptide. The peptide may act as a separator for the EDLC. A further embodiment is an electrode for an electrochemical energy storage device, the electrode-unit including: two graphene layers, CNTs, and electrolyte. The graphene layers are arranged separated along a first axis and aligned with parallel surfaces, where at least one graphene layer is coated with peptide. The CNTs are arranged along a second axis orthogonal to the first axis and disposed between the graphene layers. The electrolyte is impregnated within the volume defined between the graphene layers and CNTs.
1. An electric double-layer capacitor (EDLC) comprising at least one capacitor cell, said capacitor cell comprising:
a pair of graphene electrodes of opposite polarity, arranged along a first axis and aligned with their surfaces in parallel; and
an electrolyte, impregnated within said graphene electrodes,
wherein at least one of said graphene electrodes comprises a peptide coating acting as an inert, electrically-insulating and ion-permeable separator, wherein said capacitor cell does not comprise an additional separator beyond said peptide coating, and
wherein said peptide coating comprises at least one peptide selected from a list consisting of: Neuropeptide FF, LL-37, and Sp1.
2. The EDLC of claim 1 , wherein at least one of said graphene electrodes comprises at least one electrode-unit comprising:
a pair of graphene layers, arranged along a first axis and aligned with their surfaces in parallel and separated from one another;
a plurality of carbon nanotubes (CNTs), arranged along a second axis that is orthogonal to said first axis, and disposed in between said graphene layers, and
an electrolyte impregnated within the volume defined between said graphene layers and said CNTs.
3. The EDLC of claim 2 , wherein said volume defined between said graphene layers and said CNTs of said electrode-unit is configured to correspond to the diameter of the electrolyte ions.
4. The EDLC of claim 1 , wherein at least one of said graphene electrodes is disposed on a current collector.
5. The EDLC of claim 4 , wherein said current collector comprises a metal substrate.
6. The EDLC of claim 4 , wherein said current collector comprises a metallic foam.
7. The EDLC of claim 1 , wherein at least one of said graphene electrodes further comprises a material selected from the group consisting of:
a transitional metal oxide; and
a conductive polymer.
8. The EDLC of claim 1 , wherein said pair of graphene electrodes are configured asymmetrically, in a manner selected from the group consisting of:
said graphene electrodes being composed of different materials;
said graphene electrodes having different weights; and
said graphene electrodes having different thicknesses.
9. A method for manufacturing an electric double layer capacitor (EDLC) comprising at least one capacitor cell, the method comprising the procedures of:
arranging a pair of graphene electrodes of opposite polarity along a first axis, said graphene electrodes aligned with their surfaces in parallel;
coating at least one of said graphene electrodes with a peptide coating acting as an inert, electrically-insulating and ion-permeable separator, wherein said capacitor cell does not comprise an additional separator beyond said peptide coating, and wherein said peptide coating comprises at least one peptide selected from a list consisting of: Neuropeptide FF, LL-37, and Sp1; and
impregnating an electrolyte within said graphene electrodes.
10. The method of claim 9 , further comprising the procedure of preparing at least one electrode-unit of at least one of said graphene electrodes by:
arranging a pair of graphene layers along a first axis aligned with their surfaces in parallel and separated from one another;
arranging a plurality of CNTs along a second axis that is orthogonal to said first axis, said CNTs disposed in between said graphene layers; and
impregnating an electrolyte within the volume defined between said graphene layers and said CNTs.