Protons—subatomic particles with a positive electric charge—are one of the first particles to have formed after the universe began and are a constituent of every atom in existence today. The movement of protons plays a key role in energy conversion processes, such as photosynthesis and respiration, in biological systems. In addition, proton conduction is an important factor for hydrogen fuel cells, which are often touted as the ideal clean energy source for the next generation.
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Source: Phys.org