Investigation of Mixed Metal Oxide Bilayers in Photoelectrochemical Water Splitting: Synthesis and Functional Properties

The global annual energy consumption indicates a pressing necessity to improve efficient renewable energy technologies. PEC water splitting represents a highly promising method for generating renewable energy through solar power. Recently, mixed metal oxide bilayered thin films have emerged as promising materials for PEC water splitting, due to their tunable optoelectronic behavior, enhanced charge separation, and improved stability of the films. This document offers an in-depth analysis of synthesis techniques, structural and functional properties, and the photocatalytic energy conversion efficiency of double-layer metal oxide materials, such as BaZrO3/Cu2O, SrTiO3/Cu2O, and SrTiO3/CeO2. The discussion subsequently centers on the latest advancements in material science, including selection processes, fabrication techniques, and improvements in PEC devices. The paper's final section outlines a series of challenges that could impact the effectiveness of these systems, along with potential solutions. Additionally, it discusses future inquiries that might enhance the applicability of these systems in large-scale hydrogen production.