Comet inspires chemistry for making breathable oxygen on Mars

Comet inspires chemistry for making breathable oxygen on Mars
Konstantinos P. Giapis with his reactor that converts carbon dioxide to molecular oxygen. Credit: California Institute of Technology

Science fiction stories are chock full of terraforming schemes and oxygen generators for a very good reason—we humans need molecular oxygen (O2) to breathe, and space is essentially devoid of it. Even on other planets with thick atmospheres, O2 is hard to come by.

So, when we explore space, we need to bring our own oxygen supply. That is not ideal because a lot of energy is needed to hoist things into space atop a rocket, and once the supply runs out, it is gone.

One place molecular oxygen does appear outside of Earth is in the wisps of gas streaming off comets. The source of that oxygen remained a mystery until two years ago when Konstantinos P. Giapis, a professor of chemical engineering at Caltech, and his postdoctoral fellow Yunxi Yao, proposed the existence of a new chemical process that could account for its production. Giapis, along with Tom Miller, professor of chemistry, have now demonstrated a new for generating oxygen that Giapis says could help humans explore the universe and perhaps even fight climate change at home. More fundamentally though, he says the reaction represents a new kind of chemistry discovered by studying comets.

Most chemical reactions require energy, which is typically provided as heat. Giapis's research shows that some unusual reactions can occur by providing kinetic energy. When are shot like extremely tiny bullets onto surfaces containing oxygen, such as sand or rust, the water molecule can rip off that oxygen to produce molecular oxygen. This reaction occurs on comets when water molecules vaporize from the surface and are then accelerated by the solar wind until they crash back into the comet at high speed.

Comets, however, also emit carbon dioxide (CO2). Giapis and Yao wanted to test if CO2 could also produce molecular oxygen in collisions with the comet surface. When they found O2 in the stream of gases coming off the comet, they wanted to confirm that the reaction was similar to water's reaction. They designed an experiment to crash CO2 onto the inert surface of gold foil, which cannot be oxidized and should not produce molecular oxygen. Nonetheless, O2 continued to be emitted from the gold surface. This meant that both atoms of oxygen come from the same CO2 molecule, effectively splitting it in an extraordinary manner.

"At the time we thought it would be impossible to combine the two oxygen atoms of a CO2 molecule together because CO2 is a linear molecule, and you would have to bend the molecule severely for it to work," Giapis says. "You're doing something really drastic to the molecule."

To understand the mechanism of how CO2 breaks down to molecular oxygen, Giapis approached Miller and his postdoctoral fellow Philip Shushkov, who designed computer simulations of the entire process. Understanding the reaction posed a significant challenge because of the possible formation of excited molecules. These molecules have so much energy that their constituent atoms vibrate and rotate around to an enormous degree. All that motion makes simulating the reaction in a computer more difficult because the atoms within the molecules move in complex ways.

Comet inspires chemistry for making breathable oxygen on Mars
In Giapis's reactor, carbon dioxide is converted into molecular oxygen. Credit: Caltech

"In general, excited molecules can lead to unusual chemistry, so we started with that," Miller says. "But, to our surprise, the excited state did not create . Instead, the molecule decomposed into other products. Ultimately, we found that a severely bent CO2 can also form without exciting the molecule, and that could produce O2."

The apparatus Giapis designed to perform the reaction works like a , turning the CO2 molecules into ions by giving them a charge and then accelerating them using an electric field, albeit at much lower energies than are found in a particle accelerator. However, he adds that such a device is not necessary for the reaction to occur.

"You could throw a stone with enough velocity at some CO2 and achieve the same thing," he says. "It would need to be traveling about as fast as a comet or asteroid travels through space."

That could explain the presence of small amounts of oxygen that have been observed high in the Martian atmosphere. There has been speculation that the oxygen is being generated by ultraviolet light from the sun striking CO2, but Giapis believes the oxygen is also generated by high-speed dust particles colliding with CO2 molecules.

He hopes that a variation of his reactor could be used to do the same thing at more useful scales—perhaps one day serving as a source of breathable air for astronauts on Mars or being used to combat climate change by pulling CO2, a greenhouse gas, out of Earth's atmosphere and turning it into oxygen. He acknowledges, however, that both of those applications are a long way off because the current version of the reactor has a low yield, creating only one to two molecules for every 100 CO2 shot through the accelerator.

"Is it a final device? No. Is it a device that can solve the problem with Mars? No. But it is a device that can do something that is very hard," he says. "We are doing some crazy things with this reactor."

The paper describing the team's findings, titled "Direct dioxygen evolution in collisions of carbon dioxide with surfaces," appears in the May 24 issue of Nature Communications.


Explore further

Chemical engineers explain oxygen mystery on comets

More information: Yunxi Yao et al. Direct dioxygen evolution in collisions of carbon dioxide with surfaces, Nature Communications (2019). DOI: 10.1038/s41467-019-10342-6
Journal information: Nature Communications

Citation: Comet inspires chemistry for making breathable oxygen on Mars (2019, May 24) retrieved 15 September 2019 from https://phys.org/news/2019-05-comet-chemistry-breathable-oxygen-mars.html
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May 24, 2019
One place molecular oxygen does appear outside of Earth is in the wisps of gas streaming off comets. The source of that oxygen remained a mystery until two years ago when Konstantinos P. Giapis, a professor of chemical engineering at Caltech, and his postdoctoral fellow Yunxi Yao, proposed the existence of a new chemical process that could account for its production.


Is trivially false. It was questioned here at the time, and also by a plasma astrophysicist on a science forum. They were really short numerically. And not just by a little bit. They have since admitted this, in response to a paper that essentially debunked their claims. The original paper is here;
https://www.natur...mms15298

And the reply, pouring cold water on the claims, is here;

https://www.natur...-04972-5

Which isn't to say that their method of producing oxygen is flawed, only that it is not responsible for the O2 at comets.


May 25, 2019
Something tells me that this technique has and will always have *much* lower efficiency than various electro-chemical techniques that have been proposed. Employing kinetic energy with a mini particle accelerator? Really? Even if they manage to split 50 out of every 100 CO2 molecules how much energy will they need to spend to do it?

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