A split-second 'heat shock' can peel a material like an onion to make it 12 times more efficient.

Usually, sudden extreme heat destroys delicate fuel cell parts, but these scientists used it as a precision tool. By hitting a perovskite surface with a microsecond-scale thermal shock, they forced it to 'exfoliate' a nanometer-thin layer. This 'skin' increased the material's ability to move ions by a staggering 12.5 times and boosted its catalytic power. It is like searing a steak to lock in the flavor, but at the atomic level for energy production. This technique could make hydrogen fuel cells cheap and efficient enough for everyday cars.