Work

Quantification of Gaseous Products Evolved at Industrially Relevant Current Densities During CO 2 Electroreduction and Water Electrolysis Using Online Gas Chromatography

Year: 2025

Type: article

Abstract: The quantification of gaseous chemicals such as CO and H 2 , obtained during the electrochemical reduction of CO 2 or water using online gas chromatography (GC), is extremely relevant for the evaluation of an electrolysis system's performance. Herein, the causes that may hinder the proper calculation of Faraday efficiencies, when applying industrially relevant current densities, are demonstrated for both water electrolysis and CO 2 electroreduction (eCO 2 RR). The findings highlight that rigorous calibration and an understanding of GC linearity and detection limits are essential for accurate measurement and quantification. Furthermore, the implementation of product dilution immediately after the electrocatalytic reactor, prior to GC analysis, is introduced as a versatile approach that enables reliable product quantification across different applied current densities and GC systems.

Source: Advanced Energy and Sustainability Research

DOI: 10.1002/aesr.202500290

Authors: Raíssa Ribeiro Lima Machado, Bright Nsolebna Jaato, Torsten Claus Schmidt, Ignacio Sanjuán, Corina Andronescu

Institutions: University of Duisburg-Essen, IWW Water Centre, Universitat Jaume I

Language: English

Topic: CO2 Reduction Techniques and Catalysts

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,910