MOF-derived porous Fe2O3 2 O 3 photoanode for photoelectrochemical water oxidation

Photoelectrochemical (PEC) has become a sustainable method for water splitting and attracted more researchers' attention. The construction of photoelectrode plays an important role in its activity for PEC water splitting. In this work, we first prepared MIL-88B (Fe) using FTO as substrate by hydrothermal synthesis method. And then the alpha-Fe2O3 2 O 3 photoanode was obtained by calcination of MIL-88B (Fe). The effects of preparation conditions, such as hydrothermal duration, calcination temperature and calcination duration on the crystal structure, morphology and photoelectrochemical properties of alpha-Fe2O3 2 O 3 were systematically studied. This study is more conducive to finding a method for preparing highly efficient porous photoelectrodes. Impressively, the photoanode of Fe2O3 2 O 3 synthesized under optimal conditions shows favorable performance in water splitting. The photoelectrochemical and electrochemical characterization of the photoanodes synthesized under different conditions show that the photoanode synthesized at 100 degrees C degrees C for 10 h and then calcined at 800 degrees C degrees C for 30 min has the highest photocurrent density of 0.35 mA center dot cm-- 2 at 0.23 V vs. Ag/AgCl as well as the most negative onset potential.