Operando Stability of Single‐Atom Electrocatalysts

Single‐atom catalysts (SACs) are appealing next‐generation catalysts for various electrochemical technologies. Along with significant breakthroughs in their initial activity, SACs now face the next challenge for their viable applications, insufficient operational stability. In this Minireview, we summarize the current knowledge of SAC degradation mechanisms mainly based on Fe−N−C SACs, some of the most investigated SACs. Recent studies on isolated metal, ligand, and support degradations are introduced, and the underlying fundamentals of each degradation path are categorized into active site density (SD) and turnover frequency (TOF) losses. Finally, we discuss the challenges and prospects for the future outlook of stable SACs. Single‐atom catalysts (SACs) are among the most intriguing electrocatalysts with maximized material efficiency. For their viable application in industry, the next challenge is ensuring their long‐term stability. This Minireview summarizes the recent progress in understanding the operational stability of SACs and provides an outlook for their future developments.