Photoelectrochemistry: Enhanced Charge Transfer by Passivation Layer in 3DOM Ferroelectric Heterojunction for Water Oxidation in HCO₃⁻/CO₂ System (Small 17/2019)

In article number 1804930, Xiaobin Hu and co-workers demonstrate a two-layer ferroelectric heterojunction, in which BiFeO3 acts as the 3D macroporous skeleton and LiNbO3 as the passivation layer. This photoanode exhibits a tremendous enhancement of photocurrent density in a HCO3-/CO2 system. Photoelectrochemical impedance spectroscopy suggests that the synergistic effect of the skeleton and passivation layer promote the charge transfer by tuning surface states. This work provides a strategy for enhancing photoelectrochemical water oxidation as the anodic reaction of CO2 reduction.