In recent years, hydrogen (H2) has emerged as the best option for clean energy in our pursuit of an alternative fuel for mitigating environmental problems such as global warming. Hailed as ‘batteries of the future,’ H2 fuel cells are touted as the fuel for the future generation. While this is all well and good, there is one major problem with H2: like every other gas fuel, it is highly explosive. A minor spark can set off an explosion in the presence of as low as 4% of H2 leaked into the air, as happened in May 2019 in Gangneung, Korea, and June of the same year at the Uno-X fueling station in Norway. Therefore, safety is a major concern with handling of H2 gas; this warrants the sensing of even the smallest H2 leaks to avoid accidents.
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Source: Phys.org