| Summary: | In order to alleviate the energy crisis and propel a low-carbon economy, hydrogen (H<sub>2</sub>) plays an important role as a renewable cleaning resource. To break the hydrogen evolution reaction (HER) bottleneck, we need high-efficiency electrocatalysts. Based on the synergistic effect between bimetallic oxides, hierarchical mesoporous CoNiO<sub>2</sub> nanosheets can be fabricated. Combining physical representations with electrochemical measurements, the resultant CoNiO<sub>2</sub> catalysts present the hierarchical microflowers morphology assembled by mesoporous nanosheets. The ultrathin two-dimensional nanosheets and porous surface characteristics provide the vast channels for electrolyte injection, thus endowing CoNiO<sub>2</sub> the outstanding HER performance. The excellent performance with a fewer onset potential of 94 mV, a smaller overpotential at 10 mA cm<sup>−2</sup>, a lower Tafel slope of 109 mV dec<sup>−1</sup> and better stability after 1000 cycles makes CoNiO<sub>2</sub> better than that of metallic Co and metallic Ni.
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