1. Exploring the hydrogen evolution reaction (HER) side of perovskite-based materials during photoelectrochemical water splitting 2. Phosphorene-based functional nanomaterials for photoelectrochemical water splitting 3. Polymer-based catalyst for photoelectrochemical water splitting 4. Transition metal-based single-atom catalyst for photoelectrochemical water splitting 5. Clathrate hydrate as a potential medium for hydrogen storage application 6. Advanced carbon-based nanomaterials for photoelectrochemical water splitting 7. MXene-transition metal compound sulfide and phosphide hetero-nanostructures for photoelectrochemical water splitting 8. Design and advances of semiconductors for photoelectrochemical water-splitting 9. Dye-sensitized photoelectrochemical cells in water splitting 10. Photobiological hydrogen production: Introduction and fundamental concept 11. Biological hydrogen production driven by photo-fermentation processes 12. Photobiological hydrogen production by microorganisms 13. Photobiological production of hydrogen from biomass 14. Challenges in scaling low-carbon hydrogen production in Europe 15. Photobioreactor for hydrogen production 16. Thermochemical hydrogen production 17. Hydrogen production driven by nuclear energy 18. Hydrogen production driven by seawater electrolysis 19. Prospects and challenges for the green hydrogen market 20. Hydrogen production from biomass gasification 21. Approach toward economical hydrogen storage 22. Power-paste hydrogen storage technologies 23. Advanced nanomaterials for hydrogen storage 24. Application of hydrogen in various sectors 25. Application of machine learning approach for green hydrogen