Although I wasn't specifically thinking of those, catalysts are a great example of why I am somewhat sceptical of anyone who says "this thing is theoretically impossible" unless they actually prove it.
However, for the specific, fuel cells have a lot of waste heat. And even if they didn't, what you're describing in this situation would cause a mixture of ohmic heating and electrolysis in the water while it's being replicated — you need to get the energy out without the last 10% flash-boiling your tea into steam (or even ice cube or icecream sandwich or whatever).
To rephrase what I said before, it might not be impossible, but AFAIK nobody has a solution yet.
However, for the specific, fuel cells have a lot of waste heat. And even if they didn't, what you're describing in this situation would cause a mixture of ohmic heating and electrolysis in the water while it's being replicated — you need to get the energy out without the last 10% flash-boiling your tea into steam (or even ice cube or icecream sandwich or whatever).
To rephrase what I said before, it might not be impossible, but AFAIK nobody has a solution yet.