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Toyota is testing a hydrogen combustion engine. https://www.toyota-europe.com/news/2022/prototype-corolla-cross-hydrogen-concept https://www.toyota-europe.com/

• pornel 2y ago
  This is a dead-end. Like all ICE engines, it still emits NOx pollution that cities want to get rid of. It is even less efficient than hydrogen fuel cells. It combines energy-inefficiency of ICE with the energy-inefficiency of hydrogen generation and distribution. Hydrogen is a worse fuel than gasoline, so these engines are more complex and deliver less power. Such engines in busses would be more expensive to run, more expensive to maintain, and still have tail-pipe emissions.