Picture this: you soak up sunlight to charge a liquid “battery,” then flip a switch hours or even days later to release pure ...

A cubic arrangement of larger gray spheres interspersed with smaller green spheres. Hydrogen ions (small green spheres) chemically bond to magnesium (large gray spheres) in magnesium hydride, which is ...

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Compressing hydrogen demands high pressures; liquefying it requires extreme cooling. Both approaches carry energy penalties, safety considerations, and infrastructure costs that limit wider adoption.