Peptide-Coated Graphene Supercapacitor Electrodes
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Solution Overview
Problem
Conventional supercapacitors face limitations in energy density and internal resistance due to the need for additional separators and the anisotropic properties of graphene, which affect the performance and efficiency of electric double-layer capacitors (EDLCs).
Innovation Solution
The use of peptide-coated graphene electrodes with integrated carbon nanotubes and a peptide layer acting as both an inert, electrically-insulating, and ion-permeable separator eliminates the need for a dedicated separator, enhancing specific capacitance and energy density while reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated separator is used in conventional supercapacitors, then electrical insulation between electrodes is ensured, but device complexity and internal resistance increase
Solution Approach 1:
The patent combines the separator and electrode into a single integrated structure where the graphene electrode itself provides both electrical storage function and electrical insulation through its inherent properties, eliminating the need for a separate dedicated separator component
Solution Approach 2:
The graphene electrode serves multiple functions simultaneously: it acts as the active electrode for charge storage, provides electrical insulation between opposing electrodes, and maintains structural integrity, replacing the need for separate specialized separator components
2Reliability
If additional separators are added to conventional supercapacitors, then electrode separation is achieved, but energy density decreases
Solution Approach 1:
The separator and electrode functions are merged into a single graphene-based component, eliminating the volume occupied by separate separator materials and increasing the proportion of active energy-storing material in the device
Solution Approach 2:
The dedicated separator component is extracted/removed from the device architecture, with its separation function instead being provided by the graphene electrode's inherent properties, thereby reducing overall device volume and increasing energy density
3Ease of manufacture
If conventional electrodes are used, then manufacturing is simpler, but specific capacitance and energy density are limited
Solution Approach 1:
The patent employs composite materials including graphene, peptides, and carbon nanotubes to create electrodes with superior electrical properties, surface area, and capacitance that outperform conventional single-material electrodes
4Ease of manufacture
If graphene is used without peptide coating, then manufacturing is simpler, but internal resistance increases
Solution Approach 1:
The patent creates a composite structure where peptide molecules are coated on or integrated with graphene and carbon nanotubes, forming a multifunctional material that reduces internal resistance through enhanced conductivity and surface properties while maintaining ease of manufacture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly increases the specific capacitance and energy density of EDLCs, enabling high cycling stability and rapid charge/discharge capabilities, with the peptide layer functioning as a separator to minimize internal resistance and weight.
Implementation Method 1
peptide coating acting as an inert, electrically-insulating and ion-permeable separator
Implementation Method 2
peptide coating acting as an inert, electrically-insulating and ion-permeable separator
Implementation Method 3
an electrolyte, impregnated within the graphene electrodes
Implementation Method 4
When a voltage is applied between the electrodes, negative ions from the electrolyte flow to the positive electrode while positive ions from the electrolyte flow to the negative electrode
Implementation Method 5
an electric double layer is formed at each electrode/electrolyte interface by the accumulated ionic charges
Implementation Method 6
an electric double layer is formed at each electrode/electrolyte interface by the accumulated ionic charges
Implementation Method 7
Graphene exhibits an extremely high surface area to mass ratio
Implementation Method 8
graphene possesses very high electrical conductivity and carrier mobility
Implementation Method 9
a plurality of carbon nanotubes (CNTs), where the graphene layers are arranged along a first axis and aligned with their surfaces in parallel and separated from one another, the CNTs are arranged along a second axis orthogonal to the first axis
Data Source
AI summary
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.