One-step electrodeposition prepared MoS2 composed Ni3S2 /Ni(OH)2 nanosheets as high efficient and stable metal sulfide catalyst for hydrogen precipitation in alkaline solutions
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Preparing a cheap efficient water-resolved hydrogen electrocatalyst and used it in alkaline media is important path for hydrogen conversion and storage. Herein, a MoS 2 /Ni 3 S 2 /Ni(OH) 2 on nickle form nanoflower composited electrocatalyst were synthesized via a simple one-step electrodeposition method by using a nickel foam (NF) as the based material. The obtained MoS 2 nanoflower via this simple one-step electrodeposition method has controllable strength, uniform growth and easy operated by tuning the electrodeposition coefficient and controlling the electrodeposition time. Meanwhile, the common factor leads to poor HER performance, like incomplete exposure of the active site caused by the incontrollable formation of MoS 2 blocks, was successfully avoided. The electrodeposited MoS 2 nanoflowers and Ni 3 S 2 played an important role for reducing potential during hydrogen precipitation by synergistic effects. This synergy between the two effective catalyst promotes electron transport abilities and exposes more active-sites, leading to an enhanced HER performance. In the alkaline solution of 1.0m NaOH, the graded MoS 2 /Ni 3 S 2 /Ni(OH) 2 @NF-5min electrode shows a respectively overpotential of 48 mV at 10 mA cm -2 and 175 mV at 100mA cm -2 , whilst high conductivity and good stability with the current maintained efficient for 72 hours under current density of 10mA cm -2 after 5000 cycles.
