Ammonia borane is a proposed storage medium for hydrogen in motor fuel vehicles. It is more hydrogen-dense than liquid hydrogen and is also able to exist at normal temperatures and pressures. It is also used in organic synthesis.A proposed storage medium for hydrogen in motor fuel vehicles, also used in organic synthesis. Ammonia borane is a proposed storage medium for hydrogen in motor fuel vehicles. It is more hydrogen-dense than liquid hydrogen and is also able to exist at normal temperatures and pressures. It is also used in organic synthesis. A proposed storage medium for hydrogen in motor fuel vehicles, also used in organic synthesis.