I had the same concerns as well. It would be a really inefficient system and one that couldn't last long. The only thing that made me believe that it might be possible is that this might happen 10 years or 20 years down the road (which is a huge time in technological terms). I might be wrong and this may remain just an idea. But I think it's nice that NASA is exploring lots of ideas about keeping the Mars mission afloat.

Thanks for reading and your awesome comment :)