Hierarchical nanocomposite electrocatalyst of bimetallic zeolitic imidazolate framework and MoS2 sheets for non-Pt methanol oxidation and water splitting

A novel nanocomposite composed of a bimetallic CoNi-zeolitic imidazole framework embedded by MoS2 nanosheets (MoS2@CoNi-ZIF) was synthesized as a bifunctional electrocatalyst for both non-Pt methanol oxidation reaction (MOR) and overall water splitting in an alkaline solution. [Display omitted] •Bimetallic CoNi-zeolitic imidazole framework embedded by MoS2 nanosheets as bifunctional electrocatalyst.•Multiple functionally catalytic performances for MOR and water splitting in an alkaline solution.•Feasible synthesis without requiring calcination or other treatments.•Strong synergistic effect providing the MoS2@CoNi-ZIF catalyst with a comprehensive performance and high stability. We have explored a nanocomposite composed of a bimetallic CoNi-zeolitic imidazole framework embedded by MoS2 nanosheets (MoS2@CoNi-ZIF), as a bifunctional electrocatalyst for non-Pt methanol oxidation reaction (MOR) and overall water splitting in an alkaline solution. The series of MoS2@CoNi-ZIF nanocomposites exhibit different catalytic activities. Significantly, the MoS2@CoNi-ZIF nanosheet with a ratio of MoS2:CoNi-ZIF = 3:1 (MoS2@CoNi-ZIF(3-1)) shows the excellent electrocatalytic activity for MOR, affording an oxidation potential at 1.6 V, also with high catalytic current density and durability. Moreover, the MoS2@CoNi-ZIF(3-1) nanocomposite shows a superior electrocatalytic performance toward HER and OER. When the MoS2@CoNi-ZIF(3-1) was applied as the bifunctional catalyst for both the anode and cathode, the voltage applied to a two-electrode cell is 1.55 V to achieve a current density of 10 mA cm−2 for overall water splitting. This work provides a promising electrocatalyst for developing high-performance non-Pt-based clean energy and fuel cells in alkaline solution.