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[Display omitted] • Co-Mo-based bimetallic oxide is constructed via a facile anodization method. • The as-prepared Co/CoO/Co 2 Mo 3 O 8 catalyst displays excellent HER performance. • The unique structure benefits the H* adsorption and promotes the reaction kinetics. • The recovered Co/CoO/Co 2 Mo 3 O 8 shows reproductive HER performance. Bi-metallic oxide based electrocatalysts exhibit great potential for the hydrogen evolution reaction (HER) on account of their abundant reserves, high stability and rich active reaction sites. Getting rid of complicate and time-/energy-consuming process of previous synthesis strategies, herein, we introduce an anodization technique for quickly constructing Co-Mo-based bimetallic oxides on Co foil. As a result, the as-prepared Co/CoO/Co 2 Mo 3 O 8 shows enhanced HER performance compared with Co(OH) 2 /CoMoO 4 and CoO/CoMoO 4 , which provides an overpotential of 78 mV at a current density of 10 mA cm−2 and a Tafel slop of 59 mV dec−1 in 1 M KOH. Additionally, the recovered Co/CoO/Co 2 Mo 3 O 8 shows reproductive HER performance with an overpotential in the range of 70–90 mV, indicating the high efficiency and sustainability of the proposed anodization strategy. These findings provide a new and efficient route to construct high-stable bi-metallic or multi-metallic oxides for large-scale energy conversion application. [ABSTRACT FROM AUTHOR]