Brine Electrolyzer with Pyrochlore Catalyst for Oxygen Production
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Solution Overview
Problem
Conventional water electrolysis systems require high purity water, increasing operational costs and limiting the use of unconventional water sources, such as briny or brackish water, which could provide abundant resources for hydrogen and oxygen production, especially in space exploration applications like Mars.
Innovation Solution
A brine electrolyzer system using a pyrochlore electrocatalyst that operates at near-neutral pH and does not require deionized water, utilizing brine solutions with perchlorate salts to enhance performance and reduce the need for platinum group metals, while selectively favoring oxygen evolution and mitigating unwanted side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high purity water is used in conventional water electrolysis systems, then the system can operate reliably, but operational costs increase and availability of water sources is limited
Solution Approach 1:
The patent changes the water purity parameter from high purity (conventional) to brine/brackish water (unconventional), enabling the use of abundant water sources while maintaining system operation through specialized electrodes and catalysts designed for impure water conditions
Solution Approach 2:
The patent employs cost-effective electrode materials and catalysts that can tolerate impure water conditions, replacing the need for expensive high-purity water treatment infrastructure while maintaining acceptable operational lifespan
2Reliability
If high purity water is used in conventional water electrolysis systems, then the system can operate reliably, but availability of water sources is limited
Solution Approach 1:
The patent changes the water purity parameter from high purity to brine/brackish water, enabling the system to adapt to diverse water sources including seawater, wastewater, and extraterrestrial liquid water while maintaining operational reliability through specialized components
Solution Approach 2:
The electrolyzer system is designed with universal adaptability to process multiple types of water sources (freshwater, brine, brackish water, seawater, wastewater, extraterrestrial liquid water) using the same core technology platform
3Productivity
If conventional water electrolysis systems are used, then the system can produce hydrogen and oxygen, but dissolved salts increase operational complexity and unwanted side reactions occur
Solution Approach 1:
The patent converts the harmful effect of dissolved salts (which cause unwanted side reactions in conventional systems) into a benefit by using brine electrolysis where the salts enhance conductivity and the specialized electrodes selectively suppress harmful reactions while promoting desired hydrogen and oxygen production
Solution Approach 2:
The patent introduces selective catalysts and specialized electrode materials as intermediaries that mediate between the brine electrolyte and the electrochemical reactions, facilitating desired reactions while blocking unwanted side reactions
4Productivity
If conventional water electrolysis systems are used, then the system can produce hydrogen and oxygen, but cell voltage is higher and energy efficiency is reduced
Solution Approach 1:
The patent changes the electrolyte composition from pure water to brine, which increases ionic conductivity and reduces cell voltage, thereby improving energy efficiency while maintaining hydrogen and oxygen production productivity
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 system achieves a 25-fold higher oxygen production rate compared to NASA's MOXIE experiment while consuming 25 times less power, using brine electrolysis to produce ultra-pure oxygen and hydrogen for life support and energy production without additional purification requirements, and can operate effectively in Martian conditions.
Implementation Method 1
an anode comprising a pyrochlore... selective catalysts at the anode that favor oxygen evolution and mitigate the occurrence of unwanted side reactions
Implementation Method 2
a brine solution in contact with the anode and the cathode... device operation at near-neutral pH
Implementation Method 3
an ion exchange membrane separating the cathode and the anode
Implementation Method 4
electrolytic cell to produce H2 and O2 from a brine solution
Data Source
AI summary
Described herein is a brine electrolyzer including a pyrochlore electrocatalyst. The brine may include natural or added perchlorate salts. Also described herein are methods of using the brine electrolyzer. Advantages of this brine electrolyzer include device operation at near-neutral pH, device operation without the need for a deionized water feed, and the use of selective catalysts at the anode that favor oxygen evolution and mitigate the occurrence of unwanted side reactions.