Triggering Dual Two‐electron Pathway for H2O2 Generation by Multiple Bi−On Interlayers in Ultrathin Bi12O17Cl2 towards Efficient Piezo‐self‐Fenton Catalysis

Abstract Piezo‐self‐Fenton system (PESF) has been emerging as a promising water treatment technology but suffering from unsatisfied H 2 O 2 production efficiency. Herein, we rationally design a Bi 12 O 17 Cl 2 piezo‐catalyst with multiple Bi−O n interlayers towards highly efficient H 2 O 2 production. The introduction of Bi 3 O 4.25 layers initiates dual two‐electron pathway for H 2 O 2 generation by altering the interlayer properties. It is found that the additional Bi 3 O 4.25 layers not only enhance the polarization electric field but also serve as active sites for triggering dual pathways of two‐electron O 2 reduction and H 2 O oxidation reaction for H 2 O 2 production. Therefore, the Bi 12 O 17 Cl 2 exhibits an ultrahigh rate of H 2 O 2 generation (7.76 mM h −1 g −1 ) in pure water. Based on the adequate H 2 O 2 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.