Hydrazine is a chemical of utmost importance in our society, either for organic synthesis or energy use. The direct conversion of NH to hydrazine is highly appealing, but it remains a very difficult task because the degradation of hydrazine is thermodynamically more feasible than the cleavage of the N-H bond of NH . As a result, any catalyst capable of activating NH will thus unavoidably decompose N H . Here we show that cavitation bubbles, created by ultrasonic irradiation of aqueous NH at a high frequency, act as microreactors to activate and convert NH to NH species, without assistance of any catalyst, yielding hydrazine at the bubble-liquid interface. The compartmentation of in-situ-produced hydrazine in the bulk solution, which is maintained close to 30 °C, advantageously prevents its thermal degradation, a recurrent problem faced by previous technologies. This work also points towards a path to scavenge OH radicals by adjusting the NH concentration.
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