Tin Oxide‐Anchored MXene Composites for Enhanced Hydrogen Evolution in Alkaline Media

ABSTRACT Efficient hydrogen generation via water splitting has long been limited by substantial energy losses; however, advances in the engineering of high‐performance electrocatalysts have helped to overcome this challenge. In recent years, constructing composite structures through the deliberate optimization of two complementary materials has emerged as an effective strategy for enhancing electrocatalytic activity. Guided by this approach, we developed a SnO ₂ /MXene electrocatalyst for the hydrogen evolution reaction (HER) using a facile in situ hydrothermal synthesis. The resulting SnMX40 composite exhibits a low overpotential of 72 mV at a current density of 10 mA cm ^{− 2} and a small Tafel slope of 99 mV dec ^{− 1} in alkaline media, outperforming pristine SnO ₂ and MXene catalysts. Furthermore, the SnMX40 catalyst demonstrates excellent durability, maintaining stable performance for up to 64 h while preserving its structural integrity, as confirmed by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). The enhanced HER performance is attributed to the abundance of active sites and improved electrical conductivity provided by the composite architecture.