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| The colorized electron microscope image shows the gallium nitride towers of the artificial photosynthesis device at 52.5k magnification. These nanostructures rip water molecules apart into hydrogen and oxygen to produce clean hydrogen fuel. Image credit: Faqrul A. Chowdhury, McGill University |
This article is dated 5/03/18. Science can now produce hydrogen at 3 percent efficiency using artificial photosynthesis while natural photosynthesis efficiently is at about 0.6 percent. 5 percent will make hydrogen fuel competitive they forsee 20-30 percent using artificial photosynthesis.
https://news.umich.edu/harvesting-clean-hydrogen-fuel-through-artificial-photosynthesis/