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Chemistry

How to turn most of the CO2 an astronaut exhales into fresh oxygen

A chemical reaction that recycles carbon dioxide into fresh oxygen could provide more sustainable life support for astronauts on the moon or Mars – and as a bonus, it also produces carbon nanotubes

By Jeremy Hsu

16 September 2024

Astronauts on the International Space Station need a sustainable supply of oxygen

Shutterstock/Andrei Armiagov

Missions to the moon or Mars could get more sustainable life support from a chemical reaction that turns the carbon dioxide exhaled by astronauts into carbon nanotubes and water – which is then converted into fresh oxygen.

In initial experiments, the new method proved more efficient than the existing system used to recycle CO2 into oxygen on the International Space Station (ISS).

Zhaosheng Li at Nanjing University in China and…

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