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The production of hydrogen from water using only a catalyst and solar energyis one of the most challenging and promising outlets for the generation ofclean and renewable energy. Semiconductor photocatalysts for solar hydrogenproduction by water photolysis must employ stable, non-toxic, abundant andinexpensive visible-light absorbers capable of harvesting light photons withadequate potential to reduce water. Here, we show that a-Fe2O3 can meet theserequirements by means of using hydrothermally prepared nanorings. These ironoxide nanoring photocatalysts proved capable of producing hydrogen efficientlywithout application of an external bias. In addition, Co(OH)2 nanoparticleswere shown to be efficient co-catalysts on the nanoring surface by improvingthe efficiency of hydrogen generation. Both nanoparticle-coated and uncoatednanorings displayed superior photocatalytic activity for hydrogen evolutionwhen compared with TiO2 nanoparticles, showing themselves to be promisingmaterials for water-splitting using only solar light.

Photocatalytic hydrogen production of Co(OH)2 nanoparticle-coated {\alpha}-Fe2O3 nanorings