Enhanced Photoelectrochemical Water Oxidation Using TiO-CoO p-n Heterostructures Derived from in Situ-Loaded ZIF-67.

Exposing catalytically active metal sites in metal-organic frameworks (MOFs) while maintaining porosity is beneficial for increasing electron transport to achieve better electrochemical energy conversion performance. Herein, we propose an in situ method for MOF formation and loading onto TiO nanorods (NR) using a simple solution-processable method followed by annealing to obtain TiO-CoO. The as-prepared TiO-ZIF-67 based photoanodes were annealed at 350, 450, and 550 °C to study the effect of carbonization on photo-electrochemical water oxidation.