To add on to this comment for anyone curious about ammonia: Green ammonia production is among the top 10 emerging technologies in chemistry in 2021 [1,2]. The Haber-Bosch process consumes 1% of the worlds global energy, and generates 1.4% of the worlds carbon dioxide [3].
That being said there is a lot of research both to generate ammonia from green energy, and the work to harvest ammonia for use as a fuel cell would benefit as a secondary emergent technology.