Recent Advances of Tin Selenide Applications in Biosensors and Electrocatalysis

Tin selenide (SnSe), a two‐dimensional layered semiconductor, has emerged as a highly versatile material with significant potential in environmental sensing and electrocatalysis. Its unique physicochemical characteristics, including a high surface‐to‐volume ratio, tunable bandgap, excellent electrical conductivity, and strong catalytic activity, make SnSe particularly attractive for detecting endocrine‐disrupting compounds (EDCs) at trace concentrations. In recent years, extensive efforts have been dedicated to synthesizing SnSe nanostructures through various methods, such as thermal evaporation, hydrothermal, chemical vapor deposition, solvothermal, sputtering, and hot injection. These synthesis approaches enable fine control over morphology, crystallinity, and functional properties, thereby tailoring SnSe for specific sensing and catalytic applications. SnSe has demonstrated remarkable potential in advanced sensing platforms, including electrochemical sensors, biosensors, and gas sensors, where its high conductivity and catalytic surface promote rapid, sensitive, and selective detection. In electrocatalysis, SnSe‐based heterostructures and composites have shown promising performance toward critical reactions such as the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and carbon dioxide reduction reaction (CO 2 RR), underlining their applicability in clean energy and environmental remediation. The review addresses the major challenges limiting the practical deployment of SnSe. This review brings together recent progress on SnSe, its synthesis strategies, structural and electronic properties, and applications in sensing and electrocatalysis. This work emphasizes the potential of SnSe as a cornerstone for next‐generation sensor technologies and environmental monitoring systems, while also outlining existing challenges and future opportunities for improving stability, scalability, and integration into portable detection devices.