31/10/26 TL&DR Summary: green hydrogen’s water use is not a meaningful environmental impact. Green hydrogen, if made truly green, may actually reduce water use when it replaces black (fossil derived) hydrogen for use as a chemical. Green hydrogen’s problem- and it’s a big one- is energy use, not water use- even when that hydrogen is […]
Category: Hydrogen
Hydrogen is a Structurally Bad Battery
TL&DR Summary: poor cycle efficiency, low energy density per unit volume, and the poor use of capital which plagues all long term energy storage means, more or less kills the use of hydrogen as an energy storage medium One of the few uses of green hydrogen as a fuel that remains on the upper tiers […]
Blue Hydrogen Reconsidered?
TL&DR Summary: blue hydrogen will be cheaper than green hydrogen for the foreseeable future. But the risk remains that the product will be much cheaper if we ignore the fact that it’s not blue, but rather blackish-blue and bruise coloured due to methane and uncaptured CO2 emissions. But that can also be said about green […]
Wrecking Stuff to Make Hydrogen
A Coke can that has been dissolved in sodium hydroxide, revealing its internal plastic liner (photo credit- YouTube) TL&DR: destroying reduced metals/metalloids like aluminum and silicon is a really, really dumb way to make hydrogen. It is energetic vandalism, and generates unnecessary toxic emissions to generate a low value product. A shorter, more perfunctory version […]
Green Hydrogen as a Fuel is a Zombie Meme Idea
TL&DR summary: hydrogen as a fuel is a zombie idea. Thermodynamics and the properties of the molecule ensure that it will never be alive in economic terms. Hydrogen’s dirty present hasn’t meaningfully changed over the last 20 years, and hydrogen as a fuel isn’t a real decarbonization idea. However, while it will never be alive, […]
Green Steel = Green Iron
Image credit: Google Gemini What is “green steel”? Simple. It’s a misnomer. Iron in nature is rarely found alone. We mine its oxides as iron ores. These oxides need to be chemically reduced (gaining electrons = reduction) to take the Fe+2 and Fe+3 ions in the iron oxides, to Fe metal. And the oxygen needs […]
Will Green Hydrogen Save the Cement Industry?
Image credit: Google Gemini TL&DR summary: hydrogen can be used in cement production as a natural gas replacement, but that doesn’t solve the entire CO2 emissions of cement production. There are other problems like the lack of hydrogen flame radiance, but the deal killer is the cost per tonne of CO2 emissions averted. Hydrogen may […]
Can You Put Hydrogen in Natural Gas Pipelines? Ya, but…
Ya-but the rabbit, courtesy of Google Gemini TL&DR Summary: sure, you can re-use an existing gas pipeline to carry some quantity of hydrogen at some pressure, and do so safely. How much pressure and under what circumstances and operating conditions, and how much energy can be delivered via that repurposed pipe, and whether or not […]
Ammonia- “Ship of Fuels”? or Fuel of Fools?
image credit: Microsoft Create TL&DR: ammonia is a toxic and corrosive gas, and using it as a fuel aboard ships fails the 1st principle of safety in design. It is an insane idea, and those pushing this toxic idea should give their heads a serious shaking. I am a chemical engineer with many decades of […]
Where Does Green Hydrogen Fit?
Image credit: Google Gemini If you know my writing even a little, you’ll know where I stand on this issue. It’s as simple as my meme, but my many articles (especially this one) explain why, in detail. Those articles come with analysis and references and the comments of many experts in the field as an […]