If the only purpose of the H2 economy, from the perspective of its investors, is to greenwash the fossil fuel industry, then that explains the apparent lack of

If the only purpose of the H2 economy, from the perspective of its investors, is to greenwash the fossil fuel industry, then that explains the apparent lack of interest around photocatalytic H2 production. I expected a direct solar hydrogen production industry to start taking off years ago, but lately, from what I can see, it seems to have just languished in obscurity. Here's an open-access study from 2014 on various metal oxide nanoparticle catalysts for a solar hydrogen evolution reaction: https://link.springer.com/article/10.1007/s10562-014-1397-z https://link.springer.com/article/10.1007/s10562-014-1397-z And a more recent one where TiO2, one of the cheapest safest nanoparticles, is used as the catalyst: https://www.sciencedirect.com/science/article/pii/S1878535219301868 https://www.sciencedirect.com/science/article/pii/S187853521...