Green hydrogen energy refers to hydrogen produced through the electrolysis of water using electricity generated from renewable energy sources such as solar, wind, or hydro power. This process results in zero carbon emissions, making it a clean and sustainable form of energy. As a secondary energy carrier, green hydrogen can be utilized across multiple sectors: it can generate electricity via fuel cells, provide heat for industrial processes or residential use, power transportation through fuel cell vehicles, and serve as a feedstock in chemical industries (e.g., ammonia synthesis). Its versatility lies in its ability to store excess renewable energy, addressing the intermittency issues of solar and wind power, thus playing a pivotal role in transitioning to a low-carbon energy system. Technologies like PEM electrolyzers, which offer high efficiency and rapid response, are particularly well-suited for integrating with renewable energy sources to produce green hydrogen, aligning with the goals of carbon neutrality.