Publication date: 28th August 2024
The electrochemical conversion of carbon dioxide (CO2) to value-added products attracts attention in view of closing the carbon cycle and compensating anthropogenic CO2 emissions, using electricity from renewable source as input. In fact, in recent years, there has been a huge and growing number of papers that published on this topic. All components related to CO2 electroreduction (CO2ER) are currently being studied, including catalysts, membranes and electrolytes, but also new set-ups and reactor architectures. However, despite a nascent interest from industry, currently the vast majority of work focuses on studies on a small scale, on the order of few cm2. Nevertheless, as the reactor size begins to increase, a whole range of issues (such as long-term stability, flow channel design, separation of the products (downstream), employment of large scale quantities of electrocatalysts) begin to come up that are not present or not relevant on a small scale, limiting process performance and durability, or leading to increased process costs.
In this framework, a systematic analysis of the parameters that can influence the process as the scale increases, may help in further developing the CO2ER toward industrial application. Therefore, in this work, we analyzed the effect of electrode (morphology, wettability, composition, …), electrolyte (composition and concentration) and membrane on the selectivity and durability of gas-fed zero-gap CO2 electrolyzer in membrane-electrode assembly configuration while varying the active area from 5 to 100 cm2. In particular, silver- and copper-based materials were employed as electrocatalysts on different carbon-based substrates (characterized by diverse morphology and wettability properties) and the electrode features were optimized in terms of composition (catalysts and binder loadings) and fabrication process, aimed at reducing at the same time the production costs.
This study was developed in the framework of the research activities
carried out within the Project “Network 4 Energy Sustainable Transition—
NEST”, Spoke 4, Project code PE0000021, funded under the
National Recovery and Resilience Plan (NRRP), Mission 4, Component
2, Investment 1.3— Call for tender No. 1561 of 11.10.2022 of Ministero
dell’Universita` e della Ricerca (MUR); funded by the European
Union—NextGenerationEU.
This publication is part of the project PNRR which has received funding from the MUR – DM 118/2023.
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