Green Hydrogen Role in Sustainable Energy Transformations: A Review

• Green hydrogen mitigating the negative impacts of traditional fossil fuel sources on the environment. • The challenges that need to be overcome for green hydrogen to become a viable alternative to conventional energy sources. • The roadmap for the future development of green hydrogen technology. • The potential benefits of green hydrogen for a sustainable future and integration of renewable energy sources. Green hydrogen, derived from renewable energy sources, is emerging as a key player in the global transition to sustainable energy. This study provides a comprehensive review of recent advancements in green hydrogen production technologies, including electrolysis (proton exchange membrane, alkaline, and solid-oxide), biological methods, and thermochemical processes. Despite its potential, the green hydrogen sector faces challenges such as high production costs, energy-intensive processes, and infrastructure limitations for storage and transportation. However, global investments and policy initiatives are driving cost reductions, with projections indicating a decline in production costs to below $2/kg by 2030. Countries such as Germany, Japan, and Australia are leading large-scale hydrogen initiatives, with targets to expand electrolyzer capacity and integrate green hydrogen into industrial, transportation, and power generation sectors. Additionally, advancements in electrolyzer efficiency, material innovations, and renewable energy integration are expected to enhance hydrogen’s commercial viability. This review highlights key strategies, policy frameworks, and technological improvements needed to accelerate green hydrogen adoption, positioning it as a crucial component in achieving carbon neutrality and enhancing energy security.