MoS2/Ni(OH)2 composites derived from in situ grown Ni-MOF coating MoS2 as electrode materials for supercapacitor and electrochemical sensor

A nickel-based metal-organic framework (Ni-MOF) layer was in situ grown on the surface of the sheet MoS2 to synthesize MoS2@Ni-MOF as a precursor. In order to improve the properties of the precursor material, the final MoS2/Ni(OH)(2) material was obtained by alkalizing the precursor material. Supercapacitors and electrochemical sensors were prepared by MoS2/Ni(OH)(2) composite material. The test indicates that alkaline treatment of Ni-MOF materials is helpful to improve electrochemical performance. MoS2/Ni(OH)(2) material used as supercapacitor electrode has a high specific capacitance of 2192 F g(-1) and excellent cyclic stability (the capacitance retention rate remains 85.19% after 10,000 charge/discharge cycles). The hybrid supercapacitor (HSC) was assembled with MoS2/Ni(OH)(2) as the positive electrode and activated carbon as the negative electrode. The MoS2/Ni(OH)(2)//AC HSC device shows an excellent energy density of 50.58 Wh kg(-1) at the power density of 800 W.Kg(-1). In addition, the MoS2/Ni(OH)(2) modified GCE electrode is an excellent electrochemical sensor for the simultaneous determination of hydroquinone (HQ) and catechol (CC). The modified electrode provides wide linear ranges of 1 similar to 500 and 2 similar to 400 mu M and low detection limits of 0.43 and 0.48 mu M for HQ and CC, respectively (S/N=3). The MoS2/Ni(OH)(2) material can be applied to supercapacitors and electrochemical sensors, indicating that the material has great potential application value in energy storage and biosensing.

Automated summary

A Ni-MOF layer was synthesized on the surface of MoS2 sheet to obtain MoS2@Ni-MOF as a precursor, which was further alkalized to produce MoS2/Ni(OH)(2) material. This material showed high specific capacitance and excellent cyclic stability when used as a supercapacitor electrode, and also demonstrated great potential as an electrochemical sensor.