The Belousov–Zhabotinsky (BZ) reaction using hydrated protic ionic liquid (PIL) as reaction medium is reported. For the first time it is found that the BZ oscillation reaction occurred in certain hydrated PILs without adding strong acid such as HNO3 (see red oscillation profile). Furthermore, a stable and long-lasting self-oscillation can be realized when the component concentrations of the BZ medium are optimized.
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