fig9

Figure 9. (A) Schematic of hydrogen farm project (HFP) for scalable solar H₂ production using particulate photocatalysts for water oxidation and a shuttle ion loop for energy storage. (B) Practical realization for HFP using BiVO₄ as a water oxidation photocatalyst, Fe³⁺/Fe²⁺ as shuttle ions for energy storage and an electrolysis cell for H₂ production. Reproduced from Ref.^[83] with permission from Wiley.