Electrochemically Driven Phenazine Autoxidation Coupled With Supported Liquid Membrane Technology for Hydrogen Peroxide Production

Electrosynthesis offers a direct route to utilize clean electricity to create low–emission pathways for chemical manufacturing. For direct electrosynthesis of highly active compounds such as hydrogen peroxide (H 2 O 2 ), however, the close coupling of product formation and decomposition at electrode interfaces, together with energy intensive product–electrolyte separation, leads to energy losses and limited scalability. Here, we develop an electrified supported liquid membrane platform as a scalable and practical method for H 2 O 2 production as an important model compound. In this architecture, electrons from an external power source are temporarily stored in a designed organic mediator that is subsequently autoxidized within a physically segregated supported liquid membrane domain. This structural–decoupling strategy suppresses electrode driven decomposition, simplifies product handling, and permits independent tuning of electrochemical, transport, and product formation environments within a compact, modular device constructed from inexpensive components. The platform produces high–purity aqueous H 2 O 2 with Faradaic efficiencies up to 80%. We further demonstrate direct, on–site utilization of the generated oxidizing equivalents via in situ Fenton oxidation of an organic contaminant, thereby converting intermittent renewable electricity into localized water–treatment capability. More broadly, this strategy establishes an integrated and flexible reactor design framework for multiphase, electrochemically mediated synthetic processes beyond H 2 O 2 .