Janus electrocatalytic flow-through membrane enables highly selective singlet oxygen production

Abstract

Abstract The importance of singlet oxygen ( 1 O 2 ) in the environmental and biomedical fields has motivated research for effective 1 O 2 production. Electrocatalytic processes hold great potential for highly-automated and scalable 1 O 2 synthesis, but they are energy- and chemical-intensive. Herein, we present a Janus electrocatalytic membrane realizing ultra-efficient 1 O 2 production (6.9 mmol per m 3 of permeate) and very low energy consumption (13.3 Wh per m 3 of permeate) via a fast, flow-through electro-filtration process without the addition of chemical precursors. We confirm that a superoxide-mediated chain reaction, initiated by electrocatalytic oxygen reduction on the cathodic membrane side and subsequently terminated by H 2 O 2 oxidation on the anodic membrane side, is crucial for 1 O 2 generation. We further demonstrate that the high 1 O 2 production efficiency is mainly attributable to the enhanced mass and charge transfer imparted by nano- and micro-confinement effects within the porous membrane structure. Our findings highlight a new electro-filtration strategy and an innovative reactive membrane design for synthesizing 1 O 2 for a broad range of potential applications including environmental remediation.