Springer Proceedings in Physics publishes the latest research from the 9th International Symposium on Hydrogen Energy, Renewable Energy and Materials. This comprehensive collection explores cutting-edge theory, modelling, experimentation, and practical applications in hydrogen energy, renewable sources, and advanced materials. Readers will be able to gain insights into critical areas like hydrogen production, storage, and utilization; solar, wind, bioenergy, and use of waste materials; and next-generation materials for fuel cells, batteries, and photovoltaics.  This indispensable resource provides researchers, developers, and policymakers with the knowledge they need to accelerate the path to a sustainable future.