Efficient Hydrogen Evolution Catalysis Enabled by Ru Nanoparticles on Few‐Layer Black Phosphorus/Graphene Heterostructured Aerogels

Developing cost‐effective electrocatalysts is crucial for the hydrogen evolution reaction (HER) in water splitting. Here, we report a high‐performance HER catalyst constructed from ruthenium (Ru) nanoclusters anchored on exfoliated black phosphorus/reduced graphene oxides architectures (Ru‐EBP/rGO) via the hydrothermal method. The synthesis involves in‐situ growth of Ru nanoparticles onto the BP nanosheets, which are uniformly distributed on the conductive GA framework. This unique architecture assembled by EBP/rGO composites provides a highly conductive and porous network for facilitating charge transfer, offering abundant anchoring sites and favorable interfacial electronic environments. Meanwhile, the well‐dispersed Ru nanoclusters serve as highly active centers. Electrochemical tests demonstrate exceptional HER activity and durability for Ru‐EBP/rGO in both acidic and alkaline electrolytes. Ru‐EBP/rGO requires low overpotentials of 42 mV in 1 M KOH and 50 mV in 0.5 M H ₂ SO ₄ at 10 mA cm ⁻² , respectively, with corresponding Tafel slopes of 27.5 and 64.2 mV dec ⁻¹ . Furthermore, Ru‐EBP/rGO shows excellent long‐term stability in both acidic and alkaline electrolytes, which is attributed to the strong electronic coupling at the Ru/BP/GA heterointerface and enhances the structural and chemical robustness of the active components. This study offers a promising strategy for designing advanced heterostructured electrocatalysts for hydrogen production.