Hydrogen fuel cell vehicles (FCVs) represent another promising alternative to traditional gasoline engines. These cars use a fuel cell stack to convert hydrogen gas and oxygen from the air into electricity, which then powers an electric motor. The only byproduct of this process is pure water vapor, making hydrogen cars completely zero-emission. One of the main advantages of hydrogen over battery-electric cars is the fast refueling time, which takes only a few minutes. Brands like Toyota and Hyundai have already released hydrogen models like the Mirai and Nexo. However, the lack of a widespread hydrogen refueling network and the high cost of producing green hydrogen are major barriers to adoption. Despite these challenges, hydrogen technology is seen as a great solution for heavy-duty transportation, such as trucks and buses, where large batteries would be too heavy.