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Bismuth gadolinium oxychloride with a remarkable visible-light-responsive O2 evolution activity promoted by iodine doping.

The visible-light-responsive bismuth-based oxyhalide has recently attracted extensive attention, however, the promotion of its charge separation is still challenging. Herein, we introduce iodine into Bi2GdO4Cl to synthetize I-doped Bi2GdO4Cl (denoted as yI-Bi2GdO4Cl, 0≤y≤2). The incorporation of I- ions is found to enhance light absorption and to accelerate charge separation by combining various characterizations such as density functional theory calculation, photoelectrochemical test, electrochemical impedance spectroscopy, photoluminescence spectrum, and open-circuit voltage decay. The O2-evolving performances of 1I-Bi2GdO4Cl with optimized dopant concentration of I- ion and the IrO2 loaded 1I-Bi2GdO4Cl are tremendously promoted by ca. 4 and 45 times compared with pristine Bi2GdO4Cl. Notably, The O2 evolution rate reaches as high as 154.8 μmol·h-1 with an apparent quantum efficiency of ~1.1% at 420 nm. The synthetic iodine-doped photocatalyst remains stability after long-term photoreaction, demonstrating its potential in the field of photocatalysis.