Triggering Dual Two‐electron Pathway for H2O2 Generation by Multiple [Bi−O]n Interlayers in Ultrathin Bi12O17Cl2 towards Efficient Piezo‐self‐Fenton Catalysis.

Piezo‐self‐Fenton system (PESF) has been emerging as a promising water treatment technology but suffering from unsatisfied H2O2 production efficiency. Herein, we rationally design a Bi12O17Cl2 piezo‐catalyst with multiple [Bi−O]n interlayers towards highly efficient H2O2 production. The introduction of [Bi3O4.25] layers initiates dual two‐electron pathway for H2O2 generation by altering the interlayer properties. It is found that the additional [Bi3O4.25] layers not only enhance the polarization electric field but also serve as active sites for triggering dual pathways of two‐electron O2 reduction and H2O oxidation reaction for H2O2 production. Therefore, the Bi12O17Cl2 exhibits an ultrahigh rate of H2O2 generation (7.76 mM h−1 g−1) in pure water. Based on the adequate H2O2 yield, a PESF was constructed for acetaminophen (ACE) degradation with an apparent rate constant of 0.023 min−1. This work not only presents a potential strategy of tuning the activity of bismuth based piezo‐catalysts but also provides a good example on the construction of highly efficient PESF for environmental remediation by using natural mechanical energy. [ABSTRACT FROM AUTHOR]