it looks like the MOXIE module will be similar to one scheduled for testing in Hawai'i for work on the Moon called RESOLVE . . . it appears to use an oven to bake out oxygen from regolith samples . . . there are plenty of oxides (iron, aluminium, silicon etc.) in the martian surface rocks and, apparently, lots of peroxides too.
it's all part of NASA's In Situ Resource Utilization program, and necessary for any long term occupation of anywhere off Earth.
it would be nice to bring along some hydrogen or grab some ice and electrolyze it for the hydrogen to use in a Sabatier reaction . . . CO2 + 4 H2 → CH4 + 2 H2O + energy . . . needs heat input to start but can be self sustaining . . . CO2 can be had right from the atmosphere and you get some valuable water and methane . . . methane has about a billion uses from rocket or rover fuel to feedstock for synthesis of more complex organics from oils to plastics to people (via foodstuffs of course, but some day...).
as a kid, i thought i was born just as humans were about to realize my science fiction dreams of exploration and colonization of the solar system . . . alas, it'll have to be my grandkids, or theirs if Congress keeps up their foolishness.
[never to be sufficiently damned nixon administration killed the Apollo project and with it the Saturn V . . . now they are spending billions just to get a new "heavy lift" vehicle that will be able to put about 10% more into orbit than the Saturn V did in the seventies!]