Multilayer GDEs for long-term stable acidic CO2 reduction to formic acid

Abstract

Employing green electricity to reduce atmospheric CO2 is a sustainable method contributing to cracking down the challenges for greenhouse gas neutrality. Recently, electrochemical reduction methods using gas diffusion electrodes (GDEs) have become viable methods for converting CO2 from sources like waste incineration, cement industry, or biogenic sources to useful chemicals like CO and formic acid. Qinhao et.al demonstrated the feasibility of bismuth (Bi) based GDEs in acidic CO2 electrolysis, the results from the durability studies met the industrial demand for high current densities and long service life in a single pass method [1]. Meanwhile, it is necessary to address the limitations caused by product accumulation leading to catalyst leaching using a recirculating method. Systematic GDE engineering and engaging a protective layer (PL) for the catalyst can restrain the catalyst leaching for a long-term operation [2]. The project aims at the synthesis of multilayer substrates (GDL, CL and PL) for GDEs using solvent-free deposition methods. Through optimization of electrode properties including the layer thickness, porosity, contact angles of each layer and the distribution of reaction zones aims to deliver requirements of industrial operation with high durability. Physical characterizations and advanced morphology studies to understand the complex electrode framework. The electrochemical screening is focused on investigating the durability of electrodes under high current densities for long working hours, along with the quantification of products using GC and HPLCs. This work/poster illustrates an overview of the project plan, methodology, and experiments adopted for GDE characterization. Sample results from durability tests and electrode characterization of multilayer Bi-GDEs under acidic conditions are plotted