Engineers in Australia have developed a small ammonia gas sensor. It could enable safer hydrogen storage, and could also be used as a medical diagnostic device.
Ammonia acts as a carrier in the hydrogen storage process known as "ammonia decomposition" The sensor is based on thin, transparent tin dioxide, which can easily track ammonia at much smaller levels than similar technologies. It is able to distinguish ammonia from other gases with greater selectivity than other technologies, so the sensor appears as if it is an electric nose.