Al-based metal-organic framework for piezocatalytic hydrogen peroxide production: Efficiency, pathway, and mechanism
Abstract
Hydrogen peroxide (H2O2) is a versatile substance with a wide array of applications, and piezocatalysis represents a promising alternative approach for its on-site synthesis. In this study, we report the successful synthesis of an aluminum-based metal-organic framework (MOF) NH2-MIL-101(Al), which exhibits exceptional piezocatalytic activity. The NH2-MIL-101(Al) catalyst demonstrated good piezoresponse to the external mechanical forces, with an estimated piezoelectric coefficient of 18.2?nm V?1. Notably, the NH2-MIL-101(Al) piezocatalyst achieved a high H2O2 production rate of 8.89?mmol g?1h?1 under ultrasonic vibration, and demonstrated robust catalytic performance under complex environmental conditions. Mechanistic analysis revealed the promoted charge transfer as well as efficient O2 reduction by the induced polarized electric field over NH2-MIL-101(Al). This research contributes significantly to the advancement of novel MOF materials tailored for H2O2 production, underscoring the potential of MOFs in enhancing piezocatalytic processes.