NASA's Perseverance rover has achieved a historic milestone by producing oxygen from Mars' atmosphere—a critical step toward enabling human missions to the Red Planet.
While NASA's Ingenuity helicopter has captured headlines with the first powered flight on another world, Perseverance rover continues its vital work. Positioned to document Ingenuity's flights, Perseverance's primary mission is to search for signs of ancient microbial life. Yet, it also carries an innovative technology demonstrator: the Mars Oxygen In-Situ Resource Utilization Experiment (MOXIE).
MOXIE is designed to convert carbon dioxide from Mars' thin atmosphere into breathable oxygen. This technology could one day supply oxygen for astronauts to breathe and fuel rockets for their return journey to Earth.
As a proof-of-concept, MOXIE operates intermittently. It requires substantial power to heat its solid oxide electrolysis cell to approximately 800°C. Each run involves about two hours of warmup followed by one hour of oxygen production, consuming most of Perseverance's daily power.
MOXIE extracts CO2 from the Martian air, then uses electrolysis to split it into oxygen and carbon monoxide (CO), a byproduct that disperses harmlessly. Precisely controlling the CO2 flow prevents carbon soot buildup, which could clog the system.
Power stability is crucial: insufficient electricity reverses the reaction, turning MOXIE into a fuel cell that generates CO2 from oxygen—potentially damaging its components, as no free oxygen exists on Mars.
Limited by Perseverance's 110 watts of available power, MOXIE operates at small scale for now.
NASA confirms MOXIE's triumph: on April 20, it successfully produced 5.37 grams of oxygen—enough for an astronaut to breathe during about 10 minutes of activity. This marks the first oxygen production from another planet's resources.
Upcoming tests will refine operations and scale production. Success here paves the way for larger systems, ensuring future Mars astronauts have the oxygen needed for survival and return trips—even deployable before crewed landings.
