The Artificial Leaf - Renewable Energy - Horizons

(youtube) Adam Shaw travels to Boston to meet Harvard professor Daniel Nocera who has created a device that has the ability to replicate photosynthesis.
newtboysays...

I'm wondering how much their cobalt, phosphorous, oxygen, nickel, molybdenum, and zinc cost.
What does he mean "light harvesting infrastructure"? It seemed the whole idea was it removes the need for infrastructure and allows a small setup to make enough power for a small home.
The obvious issue seems to be the cost of a fuel cell that can power a home which probably means it will not ever be cost effective over solar cells/turbine/micro-hydro and batteries/flywheel/hydro storage.
Neat though.

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