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rich_and_beautiful t1_j8jrx8x wrote

Reply to comment by wwarnout in Scientists Successfully Split Seawater To Produce Green Hydrogen by __The__Anomaly__

Is that nearly 100% efficiency really believable? I'm no engineer, but that's a pretty tall claim for any process.

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dlamblin t1_j8jzchx wrote

I also don't get this claim. There's no chance that the amount of electricity used in the electrolysis can be regenerated 100% by using the hydrogen and oxygen produced.

It further doesn't seem to account for costs of pumping, storage, transport. Nor of handling the saltier byproduct brine. And that's really weird to the point of stupidity since they only have to take a cursory look at desalination plants to get some ideas about the issues at a production scale facility and approaches that can be applied.

Desalination of course is itself causing some issues in places like the [Persian/Arabian] Gulf, the Red Sea, soon the east Mediterranean.

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Viper_63 t1_j8kb1s2 wrote

The "nearly 100%" is in comparison to regular electrolysis.

From the abstract of the paper:

>[...]and similar performance to a typical PEM electrolyser operating in high-purity water.

The BS claim in the article is being used to push this research on social media. I don't know how many times I've come across this "news" in the last few weeks.

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Viper_63 t1_j8kashq wrote

It's misleading. The "100%" being pushed here are in regards to regular electrolysis. They have basically come up with a less efficient way to split water.

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