Perovskite BaTaO₂ N: From Materials Synthesis to Solar Water Splitting.

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Barium tantalum oxynitride (BaTaO2N) is an emerging perovskite oxynitride material.
• It possesses a small band gap, visible light absorption, and suitable band edge potentials for solar water splitting.
• Current BaTaO2N materials exhibit suboptimal performance due to synthesis, surface states, recombination, and instability.

Purpose of the Study:

• To provide a comprehensive review of BaTaO2N for solar water splitting.
• To highlight progress, challenges, and future perspectives.
• To discuss strategies for enhancing water-splitting performance.

Main Methods:

• Review of existing literature on BaTaO2N.
• Analysis of principles of photoelectrochemical (PEC) water splitting.
• Discussion of synthesis routes and fabrication methods.
• Examination of strategies for performance enhancement.

Main Results:

• BaTaO2N's crystal structure, electronic, dielectric, ferroelectric, and piezoelectric properties are detailed.
• Various strategies to improve BaTaO2N performance are discussed, including defect reduction, facet engineering, morphology control, doping, heterostructures, and cocatalyst loading.
• The review covers principles of PEC water splitting and photocatalysts for oxygen evolution.

Conclusions:

• BaTaO2N is a promising material for solar water splitting, but its performance needs significant improvement.
• Addressing material synthesis, defect control, and stability are crucial for efficient photocatalysis.
• Further research into advanced material engineering and device design is necessary to realize the full potential of BaTaO2N.