Abstract
AbstractRu‐based materials are expected to be a promising alternative to commercial Pt/C for electrocatalytic hydrogen evolution reaction (HER), but they still suffer from large overpotential and low mass activity in alkaline medium. Here, we reported Ru (∼0.24 wt%) anchored on the Mo@MoOx nanowires (Ru−Mo@MoOx) as an efficient alkaline HER electrocatalyst. The Ru−Mo@MoOx nanowires exhibit a considerably low overpotential of only 16 mV at 10 mA cm−2 and a Tafel slope of ∼30 mV dec−1 in a 1 M KOH aqueous solution, which outperform those for commercial Pt/C and most reported Ru‐based electrocatalysts. Electrochemical and structural investigations reveal that Mo@MoOx support can modulate electronic structure of Ru active sites, leading to the optimizations of adsorption and dissociation for H2O. Meanwhile the improved electron and mass transfer also contribute to the HER performance. The water electrolyzer using Ru−Mo@MoOx as the cathode afford a stable voltage of ∼1.47 V to deliver 10 mA cm−2.
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