When amphiphilic zeolites are used in water, the oxygen reduction reaction goes so well that the platinum catalyst is partly the limiting factor, a US team writes in Nature Catalysis.

If you have a surplus of renewable energy, you can store it as hydrogen and oxygen by electrolysis of water. If you want to get that energy back, you have to do the opposite with the oxygen reduction reaction (ORR). You want to do this as efficiently as possible so that you lose as little energy as possible. A team from Harvard and the Université Grenobles Alpes has found a way to make the ORR almost four times more efficient using dissolved zeolites.