A novel dye-sensitized photocatalyst developed at Science Tokyo enables the capture of long-wavelength visible light for efficient hydrogen conversion, surpassing conventional photocatalysts. By replacing the metal center of traditional complexes with osmium, the researchers achieved a photocatalyst that can absorb light with wavelengths beyond 600 nanometers. This shift in the absorption profile enables the system to harvest a broader range of the solar spectrum, generating more excited electrons to enhance hydrogen-evolution performance.