Mars' Underground Brine Could Be a Good Source of Oxygen
A new study led by Pralay Gayen at Washington University in St. Louis, Missouri, tests a device that could tap a different resource—perchlorate brine believed toe ever going to visit Mars, they may well need to make some crucial resources while they are there in order to survive long enough to explore and restock for the long return journey. Although the days of flowing surface water are long gone, the Red Planet is not entirely without the raw ingredients to make this work.
The Mars 2020 mission that launched in July is carrying an experiment with exactly this goal in mind. MOXIE—the Mars Oxygen In-Situ Resource Utilization Experiment—is a box not much bigger than a toaster that produces oxygen from atmospheric CO2. While a much larger version would be required to make liquid-oxygen fuel for a rocket, MOXIE is sized to produce about the amount of oxygen an active person needs to breathe. exist in the Martian ground at some locations. The device can split the w
The device worked quite well, producing about 25 times as much oxygen as its MOXIE counterpart can manage. MOXIE requires about 300 watts of power to run, and this device matches that oxygen output on about 12 watts. Plus, it also produces hydrogen that could be used in a fuel cell to generate electricity. And it would be smaller and lighter than MOXIE, the researchers say. Ultimately, all this just illustrates that MOXIE is working with a lower quality—but more widely accessible—resource in atmospheric CO2 instead of water.
A device like this would need to go through long-term stress testing, of course, to ensure that performance doesn't degrade over time and it is generally robust. The membrane that separates the cathode and anode sides was operated carefully to prevent the CO2 from fouling it up, for example. If your survival depends on a device you brought to Mars, malfunctions aren't an option.
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