Efficient H₂O₂ Production through a Dual-Channel Pathway on a Novel Organic-Inorganic Hybrid Piezocatalyst.

Abstract

Piezocatalysis is a promising and ecofriendly technology for hydrogen peroxide (H₂O₂) synthesis, yet its efficiency is hindered by limited active sites and poor electron-hole utilization. Herein, guided by theoretical calculations, a novel organic-inorganic hybrid piezocatalyst with abundant active sites and full utilization of electron-holes was rationally designed for the overall synthesis of H₂O₂. Results illustrated that the organic component (cobalt phthalocyanine, CoPc) switched the H₂O₂ synthesis of the inorganic component (BiOIO₃, BIO) from a single-channel two-electron water oxidation reaction (2e^- WOR) to an efficient dual-channel pathway. Specifically, Co metal centers boosted the O₂ adsorption and activation by coupling with O 2p orbitals, enabling 2e^- oxygen reduction reaction. Additionally, CoPc hybridization increased the piezoresponse, further facilitating 2e^- WOR on BIO. The optimal sample achieved an exceptional H₂O₂ yield of 751.2 μmol g^-1 h^-1 in pure water/air and exhibited excellent degradation of refractory micropollutants. Our work introduces a novel strategy for efficient H₂O₂ synthesis and facilitates the advancement of sustainable water purification technologies.