Hierarchically structured one-dimensional (1D) MoO is synthesized for the first time in ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([BMIM][TfN]). The synthesis system is very simple (single [BMIM][TfN] solvent plus MoO(acac) reactant). [BMIM][TfN] itself works as both the reaction medium and the template for the formation of these interesting 1D MoO particles with ultrathin nanosheet subunits. The as-synthesized hierarchically 1D MoO_ particles exhibit remarkable electrocatalytic activity with good long-term cycle stability for the hydrogen evolution reaction (HER) in acidic media. The HER activity of present synthesized MoO is comparable to those of the most active Mo-based electrocatalysts in acid media reported up to now. Therefore, the ionic liquid route provides us with a newly powerful tool for the synthesis of interesting alternative to noble metal catalysts for efficient electrocatalytic production of hydrogen in acidic environment.
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