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A comment on Hyundai Nexo sets new world record 887.5 km travelled on single tank of hydrogen. Parent comment

Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by eternauta3k on Tuesday May 18, 2021 @12:19PM (#27196878)
> the weight of high pressure tanks goes up with their surface area while the energy stores goes up with volume.

Nope, tank mass scales with volume because bigger tanks need thicker walls: https://en.wikipedia.org/wiki/Pressure_vessel#Scaling

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Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by abakker on Tuesday May 18, 2021 @12:37PM (#27197213)
With hydrogen this is especially problematic due to hydrogen embrittlement. https://en.wikipedia.org/wiki/Hydrogen_embrittlement
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Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by semi-extrinsic on Tuesday May 18, 2021 @06:38PM (#27202188)
Nope, because you don't make hydrogen tanks out of materials that are susceptible to hydrogen embrittlement.

In particular, pressurized automotive-size hydrogen tanks aren't made from metal at all, they are typically epoxy/kevlar/carbon fiber composites.

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Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by abakker on Tuesday May 18, 2021 @09:12PM (#27203439)
OOC, since you know what these tanks are made out of, what is the duty cycle/lifespan of those tanks? I was presented some info on Kevlar tanks for drones using fuel cells and remember thinking that the lifespan was very short.
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Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by semi-extrinsic on Wednesday May 19, 2021 @04:21PM (#27213986)
Toyota certify and guarantee their tanks for 15 years, in production cars that you can go out and buy today.
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Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by samplatt on Tuesday May 18, 2021 @11:31PM (#27204216)
Anything bound by epoxy (or any polymer?) surely will have a comparably short lifespan...
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Re:Hyundai Nexo sets new world record 887.5 km travelled on ... by Mvandenbergh on Wednesday May 19, 2021 @04:44AM (#27206048)
Right you are!
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