Entering a key stage in the development of fuel cells: making them small enough to be ubiquitous, what’s the betting these’ll be in everything everywhere within 20 years?
The world’s smallest working fuel cell has been created by US chemical engineers, at just 3 millimetres across. Future versions of the tiny hydrogen-fuelled power pack could replace batteries in portable gadgets.
While batteries are used to do that today, fuel cells are able to store more energy in the same space. Even the most advanced batteries have an energy density an order of magnitude smaller than that of a hydrogen fuel tank.