Membraneless Fuel Cell Gap Flow Ion Transport
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cells face inefficiencies due to proton exchange membrane sensitivity to temperature and humidity, fuel and oxidizer mixing issues, and the need for high flow rates which reduce power efficiency and require complex electrode selectivity, limiting their viability as portable power sources.
Innovation Solution
A fuel cell design that eliminates the proton exchange membrane by using an electrolyte flow to transport ions between an anode and cathode, with a flow generator creating a transport flow across the gap to prevent oxidizer diffusion and optimize reactant exposure, allowing for efficient fuel oxidation and oxidizer reduction without the need for selective electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a proton exchange membrane is used to separate fuel and oxidizer, then fuel and oxidizer can be kept separate, but the membrane becomes sensitive to temperature and humidity variations
Solution Approach 1:
The patent removes the proton exchange membrane from the fuel cell system entirely, replacing it with a membraneless design where fuel and oxidizer are separated by laminar flow interfaces rather than a physical membrane barrier
Solution Approach 2:
The patent introduces an electrolyte solution as an intermediary medium that enables ion transport between electrodes while maintaining fuel-oxidizer separation through controlled laminar flow, eliminating the need for temperature-sensitive membrane materials
2Loss of substance
If laminar flow is used to deliver fuel and oxidizer saturated electrolytes into a single channel, then fuel and oxidizer can be kept separate, but fuel and oxidizer mix downstream of the entry point wasting the majority of the fuel
Solution Approach 1:
The patent divides the single channel approach into separate flow paths for fuel and oxidizer, with dedicated inlet channels that maintain distinct laminar flow layers until the reaction zone, preventing premature mixing and fuel waste
Solution Approach 2:
The patent transitions from a single-channel two-dimensional flow to a multi-channel three-dimensional architecture where fuel and oxidizer streams are separated in space but converge at the electrode surfaces for reaction
3Productivity
If oxidizer is delivered to maximize exposure and reaction at the cathode, then a relatively high flow rate is required, but increasing the flow rate requires increased work thus detracting from the overall power efficiency
Solution Approach 1:
The patent replaces high-flow-rate mechanical pumping with natural convection and diffusion-driven transport mechanisms, where the electrolyte flow is generated by concentration gradients rather than external pumping work
4Reliability
If selective electrodes are used for both cathode and anode, then fuel oxidation and oxidizer reduction can be achieved, but selective electrodes have lower reaction activity rates than non-selective electrodes
Solution Approach 1:
The patent changes the operating parameters including pH, temperature, and electrolyte composition to enhance the intrinsic selectivity and activity of non-selective electrode materials, achieving both high reaction rates and selectivity through optimized conditions rather than material selection
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 design enhances power efficiency by preventing oxidizer crossover and reducing energy loss, enabling a more compact and efficient fuel cell operation that can function effectively without a proton exchange membrane, suitable for portable applications.
Implementation Method 1
A flow generator is provided for generating a transport flow of the electrolyte from the first electrode to the second electrode across the gap to transport the ions formed from the first reactant oxidized or reduced at the first electrode for reaction with the ions formed from the second reactant oxidized or reduced at the second electrode
Implementation Method 2
an anode for oxidizing the fuel into at least positive fuel ions and electrons
Implementation Method 3
a cathode for accepting electrons and reducing the oxidizer into at least negative oxidizer ions
Implementation Method 4
the flow generator is configured to generate the transport flow across the gap at a rate higher than a diffusion rate of the second reactant oxidized or reduced at the second electrode or the ions thereof within the electrolyte to essentially prevent diffusion thereof to the first electrode
Data Source
AI summary
The present invention relates to a fuel cell with a gap for transport flow of an electrolyte containing charge carrying ions from either a fuel or an oxidizer between anode and a cathode.