[Donut Media has a good summary](https://www.youtube.com/watch?v=b88v-WvqzeQ). The short answer is that they’re more expensive than EVs, the charging infrastructure remains nonexistent after 20+ years of research and development, EVs have better performance, and EVs are significantly more efficient than hydrogen cars.
They haven’t vanished by any means – they just haven’t been accepted as quickly as people may have once expected.
The problem is that we just don’t have the infrastructure to support them – unlike electricity which can be sourced from an existing network and set up on a home level, hydrogen needs a completely new network to supply it. That takes a huge investment that so far just hasn’t been cost effective.
What we are starting to see however, is a greater adoption amongst official bodies and services that operate in a more limited area – bus companies, refuse collection, government agencies and so on. If you are limited to one geographic area where there is an appropriate fuel station you can access, then hydrogen is something that is becoming more common.
If we get enough isolated networks being installed that they start to connect with each other, then we have a chance of it becoming more of a practical consumer technology, and being able to fuel vehicles for extended travel, not just within a limited distance of an isolated fuel station.
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