Water oxidation using a particulate BaZrO3-BaTaO2N solid-solution photocatalyst that operates under a wide range of visible light.

Tripping the light fantastic: Despite small band gap energies (1.7-1.8 eV), BaZrO(3)-BaTaO(2)N solid solutions (Zr/Ta≤0.1) are capable of photocatalyzing both water oxidation and reduction even under irradiation above 660 nm. Solar water splitting to form H(2) and O(2) was also demonstrated using a photoelectrochemical cell consisting of a BaZrO(3)-BaTaO(2)N solid solution as an anode and a Pt wire cathode.