Ammonia can be used for fuel. It can also serve as a chemical battery. It can be decomposed (cracked) to make hydrogen. and it can fuel internal combustion engines
Ammonia—one nitrogen atom bonded to three hydrogen atoms—may not seem like an ideal fuel: Ammonia smells foul and is toxic. But its energy density by volume is nearly double that of liquid hydrogen and it is easier to ship and distribute
"You can store it, ship it, burn it, and convert it back into hydrogen and nitrogen," says Tim Hughes, an energy storage researcher with manufacturing giant Siemens in Oxford, U.K. "In many ways, it's ideal."