Materials-science articles about a modest advance in surface chemistry (which is usually called "nanotechnology") are regularly being hyped into "big commercial breakthrough real soon now" articles. Nature and MIT Technology Review (which, despite the name, is a commercial company) are the big offenders. Super-battery or fuel cell articles appear frequently, but never seem to result in actual products.<p>Hydrogen isn't an "energy source", anyway. You have to crack it out of water or pull it out of hydrocarbons. Those processes are uphill energetically. At best, hydrogen is a storage medium.