The chloride oxidation is successfully carried out on CuCrO2/WO3 (1/1) dispersed in air-equilibrated KCl solution. The delafossite CuCrO2 is p type semiconductor characterized by an optical gap of 1.28 eV, properly matched to the sun spectrum, and a chemical stability over the whole pH range....

The photocatalytic ability of CuM2O4 (M=Al, Cr, Mn, Fe and Co) crystallizing with spinel-type structure has been evaluated according to the H2-evolution. The oxides are black and displayed a semiconducting behavior where the electronic balance comes from a small over stochiometry (CuCo2O4.016)....