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Recoverable operation strategy for selective and stable electrochemical carbon dioxide reduction to methane
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DOI：10.1038/s41560-025-01883-w.png)
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Abstract
En 中文
In the carbon dioxide (CO2) electroreduction reaction, catalysts determine, to a large extent, the system’s product selectivity, energy efficiency and stability. Conventionally, catalysts are prepared and optimized ex situ before the reaction, but they often suffer from low stability due to intrinsic structural changes during the reaction. Here we demonstrate a recoverable operation strategy for selective and stable electroreduction of CO2 to methane. In this approach, active catalysts are formed and fully reset in situ during CO2 electroreduction reaction. By stabilizing catalyst precursors and controlling the formation and removal of the catalysts, we demonstrate an over 500-hour CO2-to-methane conversion with a Faradaic efficiency of over 60% at the reduction current density of above 0.2 A cm−2 and full-cell voltage of below 4.0 V. We further showcase benefits of the recoverable operation for potential integration with intermittent renewable power supply, contributing to more than 100 days with day-on and night-off operation. Electrocatalysts for CO2 reduction are typically prepared and optimized ex situ before the reaction begins, but during reactions they may undergo changes that lower their performance. Here the authors show that active Cu catalysts can be formed on a recoverable basis and removed in situ during the CO2 reduction reaction, improving the stability of the system.
Keywords:
CO2 electroreduction
methane production
electrocatalyst stability
in situ catalyst formation
recoverable operation strategy
Journal
IF:
60.1
Papers:
987
Citations:
5.6W
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