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Producing hydrogen as a clean fuel requires either electricity or fossil fuels. Producing hydrogen peroxide for water treatment requires a complex industrial process involving solvents, catalysts, and significant energy.
Researchers at City University of Hong Kong have developed a way to make both using vibrations alone — no electricity, no external chemicals. The approach, called piezosynthesis, uses mechanical energy from vibration to drive chemical reactions directly.
The work appears in two separate peer-reviewed studies. Piezosynthesis is built on a straightforward principle: certain materials generate electric charges when mechanically deformed. In a piezoelectric material, vibration continuously deforms the crystal structure, generating a stream of charges. Those charges are then directed toward chemical reactions in water — the electron-transfer reactions needed to split water molecules into useful products.
Two results: 16 times more hydrogen and near-complete peroxide production
The team tackled two separate targets. For hydrogen production, they used a bismuth ferrite-based piezoelectric system. The challenge in piezosynthesis is that generated charges tend to recombine — canceling each other out — before reaching the reaction surface.
To overcome this, the researchers applied controlled doping and added a cocatalyst to the material. These structural modifications improved both charge utilization and surface reaction speed. The result: a sixteen-fold increase in hydrogen generation compared to the starting material, driven entirely by vibration.
For hydrogen peroxide, the team used a layered bismuth titanate structure. The system delivered a production rate of 5,890 micromoles per gram per hour without requiring any sacrificial chemicals — compounds typically added to catalytic processes to drive reactions but consumed in the process. The hydrogen peroxide has direct applications in water purification and disinfection.
Why vibrations? And why ocean waves in particular?
The appeal of piezosynthesis lies in its energy source. Mechanical vibrations are everywhere: in industrial machinery, in transport infrastructure, in the ocean. Where conventional green hydrogen production requires solar panels or wind turbines coupled to electrolysis equipment, a piezosynthesis system could run on ambient energy that would otherwise be wasted.
For coastal cities, ocean waves represent a particularly compelling input. The CityUHK team is already investigating floating catalytic platforms designed to harvest vibrations from ocean waves. Such platforms could produce green hydrogen, hydrogen peroxide for water treatment, or other valuable chemicals — all powered by the motion of the sea, without grid connections or dedicated power infrastructure.
“Waves that reach the cities’ shores could one day help produce useful chemicals, drive environmental remediation and generate clean fuels,” the researchers said. For a densely populated coastal city like Hong Kong, the prospect of energy-autonomous chemical production at sea is practically significant.
What comes next for piezosynthesis
The current results are laboratory-scale. Scaling the process up to volumes that could serve industrial or municipal demand is the central challenge ahead. The team is also working to improve the efficiency of charge transfer in piezoelectric materials — the fundamental bottleneck that limits how much of the mechanical input actually drives useful chemistry.
The broader field of piezosynthesis is expanding rapidly, with research groups exploring applications from CO₂ reduction to nitrogen fixation. The CityUHK work positions vibration-driven hydrogen and hydrogen peroxide production as two of the field’s most mature near-term applications — and ocean waves as its most abundant potential energy source.
The studies were published in the journals Nature Communication and Advanced Energy Materials.
