Hydrogen production via water ultrasonication: A review.

This review thoroughly examines the potential of water ultrasonication (US) for producing hydrogen. First, it discusses ultrasonication reactor designs and techniques for measuring ultrasonication power and optimizing energy. Then, it explores the results of hydrogen production via ultrasonication experiments, focusing on the impact of processing factors such as ultrasonication frequency, acoustic intensity, dissolved gases, pH, temperature, and static pressure on the process. Additionally, it examines advanced ultrasonication techniques, such as US/photolysis, US/catalysis, and US/photocatalysis, emphasizing how these techniques could increase hydrogen production. Lastly, to progress the efficacy and scalability of hydrogen generation through ultrasonication, the review identifies existing challenges, proposes solutions, and suggests areas for future research.