Sn-Based Electrocatalyst Stability: A Crucial Piece to the Puzzle for the Electrochemical CO2 Reduction toward Formic Acid

Nowadays, Sn-based electrocatalysts for the electrochemical CO2 reduction reaction (eCO(2)RR) toward formic acid have been reported to reach industrially relevant current densities and Faradaic efficiencies approaching 100%. However, electrocatalyst stability remains inadequate and appears to be a crucial piece to the puzzle, as lifetimes in the range of several thousands of hours should be reached for practical application and economic viability. Here, we provide insights into stability issues related to Sn-based electrocatalysts and electrolyzers for formic acid production. By determining the chemical and physical phenomena that occur during the electrochemical reduction reaction on the surface and bulk of Sn-based catalysts, we intend to elucidate the most common degradation mechanisms that impair long-term electrocatalytic activity of these catalysts. Moreover, highlighting the importance of correctly selected process conditions and an optimized reactor design allows us to unveil all necessary aspects for a stable Sn-based eCO(2)RR toward formic acid.

Automated summary

This article discusses the stability issues related to Sn-based electrocatalysts for the electrochemical reduction of formic acid, providing insights into common degradation mechanisms and emphasizing the importance of selected process conditions and reactor design for achieving stable performance in formic acid production. By studying the chemical and physical phenomena occurring during the electrochemical reduction reaction on the surface and bulk of the Sn-based catalysts, the article aims to elucidate the factors affecting long-term electrocatalytic activity.