Nontrivial Topological Surface States in Ru₃Sn₇ toward Wide pH‐Range Hydrogen Evolution Reaction

Abstract Nontrivial topological surface states (TSSs), which possess extraordinary carrier mobility and are protected by the bulk symmetry, have emerged as an innovative platform to search for efficient electrocatalysts toward hydrogen evolution reaction (HER). Here, a Sn‐based nontrivial metal Ru₃Sn₇ is prepared using electrical arc melting method. The results indicate that the (001) crystal family of Ru₃Sn₇ possesses nontrivial TSSs with linear dispersion relation and large nontrivial energy window. Experimental and theoretical results demonstrate that nontrivial TSSs of Ru₃Sn₇ can significantly boost charge transfer kinetics and optimize adsorption of hydrogen intermediates due to bulk symmetry‐protected band structures. As expected, nontrivial Ru₃Sn₇ exhibits superior HER activity to Ru, Pt/C, and trivial counterparts (e.g., Ru₂Sn₃, IrSn₂, and Rh₃Sn₂) with higher ratios of noble metals. Furthermore, the wide pH‐range activity of topologically nontrivial Ru₃Sn₇ implies the robustness of its TSSs against pH variation during the HER. These findings provide a promising approach to the rational design of topologically nontrivial metals as highly efficient electrocatalysts.