What is the principle of the hydrogen fuel cell?

The principle of a hydrogen fuel cell is that the reverse reaction of water electrolysis provides hydrogen and oxygen to the anode and cathode, respectively. After the hydrogen diffuses outward through the anode and reacts with the electrolyte, it releases electrons and reaches the electrolyte. cathode via an external load. A hydrogen fuel cell refers to a device that reacts between hydrogen and oxygen to produce electrical energy (there are also "hydrogen internal combustion engines" driven solely by the combustion of hydrogen, like BMW's hydrogen 7 series). The driving force of a hydrogen fuel cell vehicle comes from the vehicle's engine, just like a pure electric vehicle, so a hydrogen fuel cell vehicle can be understood as an "electric vehicle with its own hydrogen generator" . Advantages of hydrogen fuel cells: No pollution: Hydrogen fuel cells do not pollute the environment. By electrochemical reactions rather than by combustion (petrol, diesel) or energy storage (batteries). Burning releases pollutants such as carbon monoxide and dust. Fuel cells only produce water and heat. Noisy: Hydrogen fuel cells operate quietly, with only about 55 dB of noise, which is equivalent to the level of normal human conversation. This makes the fuel cell suitable for indoor installations or outdoor locations where noise is limited. High efficiency: The power generation efficiency of hydrogen fuel cells can reach more than 50%, which is determined by the conversion properties of fuel cells. It directly converts chemical energy into electrical energy without the need for intermediate conversion of thermal energy and mechanical energy (ggenerator).