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

材料科学 超级电容器 电极 电化学 化学工程 复合数 电容 循环伏安法 涂层 复合材料 冶金 化学 物理化学 工程类
作者
Wenhu Yang,Hao Guo,Tian Fan,Xin Zhao,Longwen Zhang,Qixia Guan,Ning Wu,Yujuan Cao,Wu Yang
出处
期刊:Colloids and Surfaces A: Physicochemical and Engineering Aspects [Elsevier]
卷期号:615: 126178-126178 被引量:39
标识
DOI:10.1016/j.colsurfa.2021.126178
摘要

• MoS 2 @Ni-MOF was prepared and alkalized to obtain MoS 2 /Ni(OH) 2 . • MoS 2 /Ni(OH) 2 has high specific capacitance and long cycling life for supercapacitor. • MoS 2 /Ni(OH) 2 was used to construct electrochemical sensor for HQ and CC. A nickel-based metal-organic framework (Ni-MOF) layer was in situ grown on the surface of the sheet MoS 2 to synthesize MoS 2 @Ni-MOF as a precursor. In order to improve the properties of the precursor material, the final MoS 2 /Ni(OH) 2 material was obtained by alkalizing the precursor material. Supercapacitors and electrochemical sensors were prepared by MoS 2 /Ni(OH) 2 composite material. The test indicates that alkaline treatment of Ni-MOF materials is helpful to improve electrochemical performance. MoS 2 /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 MoS 2 /Ni(OH) 2 as the positive electrode and activated carbon as the negative electrode. The MoS 2 /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 MoS 2 /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 ∼ 500 and 2 ∼ 400 μM and low detection limits of 0.43 and 0.48 μM for HQ and CC, respectively (S/N=3). The MoS 2 /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.
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