Triggering Dual Two-electron Pathway for H O Generation by Multiple [Bi-O] Interlayers in Ultrathin Bi O Cl towards Efficient Piezo-self-Fenton Catalysis.

Piezo-self-Fenton system (PESF) has been emerging as a promising water treatment technology but suffering from unsatisfied H O production efficiency. Herein, we rationally design a Bi O Cl piezo-catalyst with multiple [Bi-O] interlayers towards highly efficient H O production. The introduction of [Bi O ] layers initiates dual two-electron pathway for H O generation by altering the interlayer properties. It is found that the additional [Bi O ] layers not only enhance the polarization electric field but also serve as active sites for triggering dual pathways of two-electron O reduction and H O oxidation reaction for H O production. Therefore, the Bi O Cl exhibits an ultrahigh rate of H O generation (7.76 mM h  g ) in pure water. Based on the adequate H O yield, a PESF was constructed for acetaminophen (ACE) degradation with an apparent rate constant of 0.023 min . 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.