The paper "Towards a Future Hydrogen Supply Chain: A Review of Technologies and Challenges" by Fan Li et al. addresses the critical need for alternative energy sources to fossil fuels due to environmental pollution and energy crises. Hydrogen, with its high energy density and non-polluting properties, is highlighted as a promising future energy carrier. The authors review the key technologies involved in the hydrogen supply chain, including production, storage, transportation, and utilization. They discuss the challenges in each area from techno-economic, social, and policy perspectives and present prospects for future development. The introduction emphasizes the global importance of energy and the urgent need for an energy transition. Hydrogen is introduced as a sustainable and versatile energy carrier, with applications in power generation, transportation, and chemical industries. The concept of a "hydrogen economy" is discussed, emphasizing the need for a comprehensive hydrogen supply chain. The paper then delves into the technologies for hydrogen production, storage, transportation, and utilization. For hydrogen production, methods from fossil fuels, biomass, and water are reviewed. Steam reforming (SR), partial oxidation (POX), and coal gasification are discussed for fossil fuels, while biomass gasification and pyrolysis are explored for biomass. Water electrolysis, including alkaline water electrolysis (AWE), proton exchange membrane electrolysis (PEME), and solid oxide electrolysis (SOE), is detailed for water-based production. In terms of hydrogen storage, the paper covers gaseous, liquid, and solid-state storage methods. Gaseous storage involves compressing hydrogen in tanks or underground reservoirs, while liquid storage includes cryogenic liquid hydrogen and organic liquid hydrogen carriers. Solid-state storage focuses on physical adsorption and chemical hydride storage, highlighting their advantages and challenges. The challenges in constructing a hydrogen supply chain are analyzed, including economic, social, and policy issues. The paper concludes by discussing the prospects for future development, emphasizing the need for further research and technological advancements to overcome existing challenges and realize the potential of a hydrogen economy.The paper "Towards a Future Hydrogen Supply Chain: A Review of Technologies and Challenges" by Fan Li et al. addresses the critical need for alternative energy sources to fossil fuels due to environmental pollution and energy crises. Hydrogen, with its high energy density and non-polluting properties, is highlighted as a promising future energy carrier. The authors review the key technologies involved in the hydrogen supply chain, including production, storage, transportation, and utilization. They discuss the challenges in each area from techno-economic, social, and policy perspectives and present prospects for future development. The introduction emphasizes the global importance of energy and the urgent need for an energy transition. Hydrogen is introduced as a sustainable and versatile energy carrier, with applications in power generation, transportation, and chemical industries. The concept of a "hydrogen economy" is discussed, emphasizing the need for a comprehensive hydrogen supply chain. The paper then delves into the technologies for hydrogen production, storage, transportation, and utilization. For hydrogen production, methods from fossil fuels, biomass, and water are reviewed. Steam reforming (SR), partial oxidation (POX), and coal gasification are discussed for fossil fuels, while biomass gasification and pyrolysis are explored for biomass. Water electrolysis, including alkaline water electrolysis (AWE), proton exchange membrane electrolysis (PEME), and solid oxide electrolysis (SOE), is detailed for water-based production. In terms of hydrogen storage, the paper covers gaseous, liquid, and solid-state storage methods. Gaseous storage involves compressing hydrogen in tanks or underground reservoirs, while liquid storage includes cryogenic liquid hydrogen and organic liquid hydrogen carriers. Solid-state storage focuses on physical adsorption and chemical hydride storage, highlighting their advantages and challenges. The challenges in constructing a hydrogen supply chain are analyzed, including economic, social, and policy issues. The paper concludes by discussing the prospects for future development, emphasizing the need for further research and technological advancements to overcome existing challenges and realize the potential of a hydrogen economy.