Anion-Exchange-Membrane-Free Electrolyzers via Interfacial Microenvironment Engineering for Stable Oxygen Reduction to Hydrogen Peroxide
Abstract
Porous solid electrolyte (PSE) reactors have shown great promise for directly producing electrolyte-free products; however, the use of anion-exchange membranes (AEMs) may introduce cost and stability challenges. Here, we demonstrate an alternative AEM-free PSE reactor design that enables extended electrolysis stability and high product concentrations. By integrating a thin layer of anion-exchange resin wafer to maintain interfacial alkalinity and redesigning the gas-flow pattern in the PSE reactor to prevent cathode flooding, we achieved one-month continuous and stable electrosynthesis of hydrogen peroxide under a high current density of 200 mA cm –2, while continuously delivering a product concentration of 3.7 wt %. This AEM-free PSE reactor concept was further validated in other electrocatalytic systems, including CO 2 reduction to formic acid.
Fields of Study & Subjects
CO2 Reduction Techniques and Catalysts
Hybrid Renewable Energy Systems
Electrocatalysts for Energy Conversion
Publication details
- Journal / source
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Volume
- 148
- Issue
- 21
- Pages
- 22305–22312
- Publication date
- 7 May 2026
- Language
- EN