Is hydrogen internet combustion engine a realistic? What are the advantages and disadvantages of it.

A hydrogen internal combustion engine (HICE) is a type of internal combustion engine that uses hydrogen as its fuel instead of gasoline or diesel. While this technology is theoretically realistic, it has not been widely adopted, and many companies have shifted their focus to other alternative fuel technologies, primarily hydrogen fuel cells and battery electric vehicles. Here are some advantages and disadvantages of HICEs:

Advantages:

1. Reduced greenhouse gas emissions: Since hydrogen combustion produces water vapor as the primary byproduct, HICEs can contribute to lower greenhouse gas emissions compared to traditional internal combustion engines.
2. Energy security: Hydrogen can be produced from various sources, including natural gas, biomass, and electrolysis of water, increasing energy security and reducing dependence on petroleum.
3. Existing infrastructure: HICEs can be built using existing internal combustion engine technology, reducing the need for extensive infrastructure development.

Disadvantages:

1. Efficiency: HICEs are generally less efficient than hydrogen fuel cell systems and battery electric vehicles, as they convert hydrogen's chemical energy into mechanical energy through combustion.
2. Storage and distribution: Hydrogen storage and distribution pose significant challenges, as hydrogen has low energy density and requires high-pressure tanks or cryogenic storage.
3. Production: Most hydrogen production methods still rely on fossil fuels, which means that the overall environmental benefits of HICEs are limited unless clean energy sources are used for hydrogen production.