Controlled synthesis and electrocatalytic applications of atomically precise AuAg nanoclusters: a review

Abstract

Bimetallic nanoclusters possess tunable physicochemical properties, improved performance, and enhanced stability for versatile applications. Among them, atomically precise AuAg nanoclusters have an important position in the series of bimetallic nanoclusters thanks to the easy preparation and crystallization, unique electronic structure, and robust stability. In this review, the general introduction of bimetallic nanoclusters and the uniqueness of AuAg nanoclusters are first explained. Then, the main strategies for the controlled synthesis of AuAg nanoclusters are summarized, with examples to illustrate the workflow and potential limitations. Following this, atomically precise AuAg nanoclusters for electrocatalytic applications, including overall water splitting, CO2 reduction reaction, and urea electrosynthesis, are discussed. In this major part, carefully chosen examples are analyzed to reveal the atomic-level structure-performance relationship and to understand the fundamental reaction mechanism. Finally, the current challenges and future outlooks in this field are discussed critically.