I would say it is probably yes to the first and no to the second with a caveat - just because you can doesn't necessarily mean that you should. You can power your cellphone on an integral kerosene fuel cell but it doesn't really make sense to do so except maybe in very narrow circumstances. Not that you shouldn't but a lot of potential advanced techniques fall in and out of favor like how CMOS went from power efficent electronics to the way as power efficiency dominated over gate efficiency.