Amorphous Fe(OH) Passivating CeO Nanorods: A Noble-Metal-Free Photocatalyst for Water Oxidation.

Noble-metal-free composites with good photocatalytic property are of great interest. Here, CeO nanorods composites loaded with amorphous Fe(OH) cocatalyst were designed and prepared via a secondary water bath at 100 °C. The as-synthesized CeO /amorphous Fe(OH) composites exhibited superior light photocatalytic activities compared to pure CeO , especially the sample with a loading time of 60 min. The photocatalytic oxygen generation rate could reach to 357.2 μmol h  g , and the average apparent quantum yield (AQY) was 24.67 %, which was a 5.5-fold increase compared to the CeO sample. The improvement of photocatalytic performance could be ascribed to three main reasons: First, loading the amorphous Fe(OH) enlarged the specific surface area and passivated the surface of the pristine CeO . Second, the amorphous Fe(OH) ,which acted as a cocatalyst, provided many active sites, and reduced the reaction activation energy. Thirdly, the maximum interface with intimate contact between CeO and amorphous Fe(OH) cocatalyst accelerated the photogenerated charge separation efficiency and thus improved the photocatalytic performance of CeO in photocatalytic water oxidation.