OT: Very interesting solar energy advancement

https://www.energy.gov/eere/fuelcells/fact-month-february-2019-process-produce-hydrogen-water-using-sunlight-reaches-162
Fact of the Month February 2019: A Process to Produce Hydrogen from Water Using Sunlight Reaches 16.2% Efficiency, on Its Way to Meeting DOE Target
Big question is the cost and how it scales up, ie do you need a facility the size of a house to produce the hydrogen to supply one house.
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