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N‐Heterocyclic carbene (NHC)‐stabilized metal nanoparticles (NPs) have recently attracted considerable attention. While most efforts in the field have been devoted to the development of NHC‐tethered monometallic NPs and enhancing their stabilities under various conditions, their bimetallic counterparts are rare in the literature. Herein, we demonstrate that the covalent immobilization of Au and Ag atoms on polymerized NHCs is a powerful method to access bimetallic AuAg NPs. In addition, we show that while AuAg alloy NPs are often obtained via this method, the use of bimetallic polymeric substrates with lower Ag content, relative to Au, results in the formation of core–shell NPs with Au core and Ag shell. Application of these nanomaterials for oxygen reduction reaction is demonstrated with all materials exhibiting electrocatalytic activity. This work demonstrates for the first time that while bimetallic poly(NHC‐metal)s are viable substrates to access NHC‐stabilized bimetallic NPs, careful adjustment of metal content in the polymeric substrates can finetune the microstructure of the resulting NPs, i.e. alloy vs. core–shell. [ABSTRACT FROM AUTHOR]

Polymerized N- heterocyclic carbenes ( NHCs) are employed to covalently anchor Au and Ag atoms,resulting in bimetallic random copolymers, as reported by Ali Nazemi et al. in their Research Article ( e202409800). When these polymers are used as substrates and undergo reduction, they produce polyNHC- capped alloy and core- shell AuAg bimetallic nanoparticles, whose structures are influenced by the proportion of each metal in the metallopolymer. These nanomaterials have been shown to be effective in electrochemical oxygen reduction reaction. [Extracted from the article]