Harnessing Solar Energy for Sustainable Fuel Production via Thermochemical Pathways

Thermochemical solar fuel generation is an emerging and sustainable approach to converting abundant solar energy into storable chemical fuels. By harnessing concentrated solar power (CSP) to drive high-temperature endothermic reactions, water (H₂O) and carbon dioxide (CO₂) can be transformed into clean fuels such as hydrogen (H₂), syngas, and value-added hydrocarbons. This chapter provides a comprehensive overview of the fundamental principles, thermodynamic considerations, and key thermochemical pathways for solar fuel production, including artificial photosynthesis, CO₂ splitting, H₂O splitting, and ammonia synthesis. The environmental and economic benefits of these processes are discussed alongside the current technological challenges, such as high operating temperatures, material stability, reactor design, and scalability. Potential solutions, including advanced redox materials and innovative reactor architectures, are explored. By highlighting recent advancements and future directions, this chapter emphasizes the vital role of thermochemical solar fuel generation in achieving a carbon-neutral and sustainable energy future.