653
How is the hydrogen made? (slrpnk.net)
submitted 2 years ago by to c/science_memes@mander.xyz
94 comments fedilink hide all child comments
 

cross-posted from: https://slrpnk.net/post/8569504

How is the hydrogen made?

you are viewing a single comment's thread
view the rest of the comments
[–] 246 points 2 years ago* (48 children)

To save you all a google: it's made from natural gas, at a pretty significant energy loss compared to just burning the gas. It generates about 4 times more co2 than burning diesel.

  • permalink
  • fedilink
  • source
  • hideshow 53 child comments
    •
  • [–] 65 points 2 years ago (5 children)

    That is true of all colours of hydrogen other than green (and possibly natural stores of 'fossil' hydrogen if they can be extracted without leakage).

    Green hydrogen is better thought of as a battery than a fuel. It's a good way to store the excess from renewables and may be the only way to solve problems like air travel.

    How hydrogen is transforming these tiny Scottish islands

    That's not to say it's perfect. Hydrogen in the atmosphere slows down the decomposition of methane so leaks must be kept well below 5% or the climate benefits are lost. We don't have a good way to measure leaks. It's also quite inefficient because a lot of energy is needed to compress it for portable uses.

    And, of course, the biggest problem is that Big Carbon will never stop pushing for dirtier hydrogens to be included in the mix, if green hydrogen paves the way.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 10 child comments
    •
  • [–] 29 points 2 years ago

    Storing hydrogen is also really hard. It needs to be kept extremely cold, and when it isn't, it tends to pass right through most storage units.

    But as a local battery, it can be very useful. Or for applications in large machinery where batteries aren't a useful option yet.

  • permalink
  • fedilink
  • source
  • parent
  • [–] 9 points 2 years ago (2 children)

    If the leaks of hydrogen should be kept under 5%, we don't have a good track record of keeping gas leaks under control anyway...

    https://youtu.be/K2oL4SFwkkw?si=Kn-uO64U4X5B_szD

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [–] 15 points 2 years ago

    Yes. I'm not watching a video but it is a serious problem, especially as hydrogen degrades metals and finds its way out anyway. The private sector cannot be trusted to self-regulate nor the government to meaningfully regulate.

    Trying very hard not to succumb to nihilism here ...

  • permalink
  • fedilink
  • source
  • parent
  • [–] 7 points 2 years ago

    And better yet, if the excess heat can be used. Last Friday i heard a sales rep from a (green) hydrogen company describe their solution as a heating solution that produce hydrogen at an energy storage conference. Seems fair to me😊

  • permalink
  • fedilink
  • source
  • parent
  • [–] 6 points 2 years ago (4 children)

    I really don’t get why hydrogen remains popular. Hydrogen is significantly less efficient than lithium batteries in storing electricity. There are currently dozens of technologies on the way for improving batteries beyond what’s possible with lithium. So what’s the market potential for green hydrogen again?

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 6 child comments
    •
  • [–] 10 points 2 years ago (1 child)

    It wins by a huge margin on the energy to weight ratio. In scenarios where weight doesn't matter it's dumb, but there is potential in places like air travel where it does make sense.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 5 points 2 years ago

    Batteries are too heavy for many applications (including, arguably, cars).

    That doesn't make hydrogen the only solution but it is at least a currently available solution. I posted a link about why the Orkneys (population 23k) are producing hydrogen and switching much of their transport to it: they have so much wind the UK (population 70m) national grid can't take all the power they generate from it.

  • permalink
  • fedilink
  • source
  • parent
    • load more comments (2 replies)
    • load more comments (43 replies)