NiO load K2Fe4O7 enhanced photocatalytic hydrogen production and photo-generated carrier behavior

Improving the efficiency of photocatalytic water splitting hydrogen production of iron-containing metal oxide photocatalysts is still a huge challenge. Herein, the new application of K 2 Fe 4 O 7 for photocatalytic hydrogen production was proposed, and its photocatalytic performance was studied. Moreover, NiO was loaded on the surface of the K 2 Fe 4 O 7 , and improved the photocatalytic performance of K 2 Fe 4 O 7 . To understand the reason for the performance improvement, electrochemical impedance spectra, Surface photovoltage (SPV) and Transient photovoltage (TPV) were used to investigate the photogenerated carrier transportation mechanism of the samples. The result shows that the excellent photocatalytic performance of the samples was mainly due to the photogenerated electrons of K 2 Fe 4 O 7 transferred to NiO, which enhanced the separation and transport of photogenerated carriers.