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I don’t see much practical use from this work. It is very easy to generate hydrogen from methanol from small fuel reformers which can be onboard for vehicular use.
Yeah, they’re selling this as a sustainable reaction because the second product is apparently formic acid instead of CO2. But of course that means less hydrogen per molecule of methanol and the efficiency using sunlight also seems to be low. So I would agree, sustainable in theory but absolutely nowhere near practical for anything.

