Flexible Glucose Fuel Cell for Volumetric Power Density
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Solution Overview
Problem
Current glucose fuel cells face limitations in volumetric power density and biocompatibility, making them unsuitable for long-term implantation in the human body, with enzyme-based systems degrading quickly, microbial systems raising safety concerns, and solid-state systems being catalytically inefficient.
Innovation Solution
A flexible, implantable glucose fuel cell design with high-surface-area electrodes, using a nanoporous platinum anode, a sulfonated fluoropolymer-based cathode with single-walled carbon nanotubes, and a flexible membrane, allowing for increased reactive surface area within a small volume, and the ability to be rolled or deformed for efficient energy harvesting and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If enzyme-based catalysts are used in glucose fuel cells, then catalytic efficiency and volumetric power density are improved, but the lifetime is reduced due to enzyme degradation
Solution Approach 1:
The patent accepts the limited lifetime of enzyme-based catalysts as an inherent constraint and designs the fuel cell system to be replaceable rather than attempting to create permanently durable enzymes. The flexible, implantable design allows for periodic replacement of the entire fuel cell assembly, treating it as a disposable medical device that provides high power density during its operational lifetime but can be replaced when enzymes degrade.
2Productivity
If microbial catalysts are used in glucose fuel cells, then catalytic efficiency and power output are improved, but biocompatibility and safety concerns worsen
Solution Approach 1:
The patent extracts and removes the problematic microbial components from the system, selecting instead solid-state abiotic catalysts that provide sufficient catalytic activity without the biocompatibility issues of living organisms. This extraction of biological elements resolves the contradiction by eliminating safety concerns while maintaining functional performance.
Solution Approach 2:
The patent replaces biological catalytic systems (enzymes and microbes) with abiotic solid-state catalysts, substituting mechanical/chemical materials for biological systems. This substitution eliminates biocompatibility concerns while maintaining catalytic function through carefully selected solid materials.
3Object-affected harmful factors
If solid-state catalysts are used in glucose fuel cells, then biocompatibility is improved, but catalytic efficiency and power density worsen
Solution Approach 1:
The patent employs composite material structures combining multiple solid-state catalysts with different functionalities. By creating composite electrode materials that integrate different catalytic components, the system achieves enhanced power density while maintaining biocompatibility, as the composite structure synergistically improves catalytic efficiency without introducing biological elements.
Solution Approach 2:
The patent utilizes porous solid-state catalyst structures that increase the effective surface area and catalytic activity. The porous architecture allows greater glucose access to catalytic sites, significantly boosting power density while the solid-state porous materials remain biocompatible for implantable applications.
4Productivity
If high-surface-area electrodes are used in glucose fuel cells, then volumetric power density is improved, but device complexity increases
Solution Approach 1:
The patent employs curved and folded electrode geometries rather than simple planar structures. The flexible fuel cell can be rolled or folded into compact three-dimensional configurations that dramatically increase the effective electrode surface area within a small implantable volume, achieving high volumetric power density through geometric innovation rather than material complexity.
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
The flexible glucose fuel cell achieves a twenty-fold increase in volumetric power density, enabling the operation of medical devices with improved biocompatibility and extended durability, suitable for implantation in cerebrospinal fluid environments, providing sufficient power for micro- and nano-electronics.
Implementation Method 1
glucose is oxidized at the anode
Implementation Method 2
Enzyme-based glucose fuel cells have high catalytic efficiency
Implementation Method 3
oxygen is reduced to water at the cathode
Implementation Method 4
a membrane is disposed between the anode and the cathode and separates the anode from the cathode
Implementation Method 5
a sulfonated fluoropolymer-based cathode with single-walled carbon nanotubes
Implementation Method 6
the underlying substrate as well as at least one of the anode and cathode is produced in such a way that they have exceptional flexibility
Data Source
AI summary
A glucose fuel cell for reception into a given constrained volume of implantation in a vertebrate in which the glucose fuel cell has access to fluid containing glucose. The fuel cell includes an anode adapted to oxidize the glucose, a cathode adapted to reduce an oxidant, and a membrane disposed between the anode and the cathode and separating the anode from the cathode. At least one of the anode or cathode define a flexible sheet that is geometrically deformed to be receivable into the given constrained volume of implantation and increase volumetric power density. Related methods of making a glucose fuel cell of this type and implantable assemblies including the glucose fuel cell are also disclosed.