Today is the last day The 5th China (Guangzhou) International Automobile Exhibition opens for public. I and my friend went to the show and saw a big ad of hydrogen energy in BMW’s stall. The Hydrogen 7’s standard combustion engine has been adapted to run on both liquid hydrogen and regular gasoline as well. Linde provides the refueling technology.

Adapted from the press image of European Hydrogen and Fuel Cell Technology Platform

Where do hydrogen comes from? BMW said hydrogen comes from water which is a plenty on the planet. But I don’t believe we are going to get hydrogen from water electrolysis which relies on additional/more energy. And can I refuel liquid hydrogen everywhere like gasoline? And why liquid hydrogen? I know there are lots of papers on J. Chem. Mater. or Chem. Mater. talking about porous hydrogen storage materials. Moreover it is said that the car eats up too much hydrogen.