Proton Exchange Membrane technology was first used to generate oxygen for submarines, laying the foundation for modern green hydrogen. 🌈 The "Color" Spectrum of Modern Production Today, hydrogen is categorized by its carbon footprint: Gray: Produced from natural gas; emits significant CO2cap C cap O sub 2 . It currently makes up the vast majority of supply.
The U.S. has seen a slowdown following changes to tax credits and the cancellation of major federal funding, such as $1.2 billion previously slated for California's hydrogen hub.
High power prices and interest rates make green hydrogen 2–3 times more expensive than fossil-based versions.
For over a century, hydrogen has been a staple in chemical processes like ammonia production for fertilizers and desulfurizing oil.
Henry Cavendish first identified hydrogen as a distinct element, famously showing it creates water when sparked.
Same as gray, but with carbon capture technology to reduce emissions.
The "long story" of hydrogen as an energy source is a journey from 18th-century chemistry to its current role as a potential (though complicated) "master key" for the global energy transition. 🧪 Scientific Roots & Early Use
Despite massive hype, the industry is at a crossroads in 2025–2026: