Large‐Scale, Controllable Synthesis of Ultrathin Platinum Diselenide Ribbons for Efficient Electrocatalytic Hydrogen Evolution

Abstract 2D platinum diselenide (PtSe 2 ) exhibits exceptional layer‐dependent electrical properties and high catalytic activity for hydrogen evolution reactions, making it an ideal system for studying structure–activity correlations. However, the synthesis of high‐quality atomically thin PtSe 2 materials has proven challenging. This study presents a simple chemical vapor deposition method for synthesizing high‐quality ultrathin 1T‐PtSe 2 ribbons on Au foils, making it easily applicable. Theoretical and experimental results confirm that these atomically thin 1T‐PtSe 2 ribbons possess abundant catalytic sites and can serve as ideal electrocatalysts. This study advances the large‐scale synthesis and potential application of ultrathin transition metal disulfides and presents a novel method for designing and synthesizing highly active ultrathin catalysts.