Reversible Fuel Cell Closed-Loop Oxygen and Water Recirculation
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Solution Overview
Problem
Current reversible electrochemical systems for energy storage and generation require external resources for hydrogen, water, and oxygen, limiting their self-sustaining capabilities and efficiency.
Innovation Solution
A self-refueling power-generating system comprising a reversible device with a stack of electrochemical cells, membrane assemblies, and a controller that alternates between fuel cell and electrolyzer modes, utilizing hydrogen-side and oxidant-side catalyst layers separated by a separation layer, along with hydrogen and oxygen units for closed circuits, and a water unit for closed-loop water management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reversible electrochemical systems use external resources for hydrogen, water, and oxygen supply, then the system can operate continuously, but the self-sustaining capability and operational independence are limited
Solution Approach 1:
The system implements self-service by integrating an electrolyzer unit that automatically generates hydrogen from water when fuel cell hydrogen levels are low, and by incorporating a water-gas shift module that produces additional hydrogen from carbon monoxide and water vapor. This eliminates the need for external hydrogen refueling infrastructure while maintaining continuous operation capability.
Solution Approach 2:
The reversible electrochemical device serves multiple functions: it operates as a fuel cell during power generation mode, as an electrolyzer during hydrogen refueling mode, and the water-gas shift module provides additional hydrogen production capability. This multi-functionality allows the system to sustain itself without external resources.
2Loss of substance
If the system operates in closed-loop mode with internal hydrogen and oxygen circulation, then refueling costs are reduced, but the system complexity increases due to additional compression and separation units
Solution Approach 1:
The system recovers and recycles hydrogen and oxygen that would otherwise be wasted. The hydrogen unit captures hydrogen produced during electrolysis and feeds it back to the fuel cell, while the oxidant unit manages oxygen circulation. This closed-loop approach eliminates the need for continuous external hydrogen refueling.
Solution Approach 2:
The compressor acts as an intermediary device that enables closed-loop operation by pressurizing gases for efficient circulation between the fuel cell, electrolyzer, and storage units. The gas/liquid separation module serves as another intermediary that purifies hydrogen and oxygen streams, ensuring efficient recycling while managing system complexity through specialized intermediate components.
3Productivity
If the reversible device uses discrete electrolysis-active areas and energy generation-active areas, then the catalytic efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The electrode structure is segmented into distinct functional areas: electrolysis-active areas for hydrogen generation, energy generation-active areas for power production, and intermediate transition areas. This segmentation allows each region to be optimized for its specific function, improving overall catalytic efficiency while maintaining manufacturability through modular assembly processes.
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
Enables self-sustained operation without external hydrogen, water, or oxygen, optimizing energy generation and storage by regenerating hydrogen and oxygen, reducing maintenance and refueling costs, and improving operational efficiency.
Implementation Method 1
a hydrogen-side catalyst layer configured to catalyze hydrogen oxidation in the fuel cell mode and to catalyze hydrogen formation in the electrolyzer mode
Implementation Method 2
an oxidant-side catalyst layer configured to catalyze oxygen reduction in the fuel cell mode and to catalyze oxygen formation in the electrolyzer mode
Implementation Method 3
the reversible device configured to be operated alternately as a fuel cell in a fuel cell mode and as an electrolyzer in an electrolyzer mode
Implementation Method 4
the reversible device configured to be operated alternately as a fuel cell in a fuel cell mode and as an electrolyzer in an electrolyzer mode
Data Source
AI summary
Self-refueling power-generating systems and methods of configuring them are provided, which enable operation in a self-sustained manner, using no external resource for water, oxygen or hydrogen. The systems and methods determine the operation of reversible device(s) in fuel cell or electrolyzer mode according to power requirements and power availability, supply oxygen in a closed circuit, compressing received oxygen in the electrolyzer mode, and supplying water or dilute electrolyte in a closed circuit in conjunction with the closed oxygen supply circuit by separating oxygen produced by the reversible device(s) in the electrolyzer mode from the water or dilute electrolyte received from the reversible device(s). Membrane assemblies may comprise a binder and be hot-pressed to enhance their long-term performance and durability.