NiS Hollow Spheres for High‐Performance Supercapacitors and Non‐Enzymatic Glucose Sensors

Abstract

α-NiS and β-NiS hollow spheres were successfully synthesized via the Kirkendall effect under different hydrothermal conditions. The obtained α-NiS and β-NiS hollow spheres were evaluated as electrode materials for supercapacitors. Importantly, the α-NiS hollow sphere electrode has a large specific capacitance (562.3 F g(-1) at 0.60 A g(-1)) and good cycling property (maintaining about 97.5% at 2.4 A g(-1) after 1000 cycles). Furthermore, the as-prepared α-NiS and β-NiS hollow spheres were successfully applied to construct electrochemical glucose sensors. Especially, the α-NiS hollow spheres exhibit a good sensitivity (155 μA mM(-1) cm(-2)), low detection limit (0.125 μM), and a wide linear range.

Facile hydrothermal synthesis of hexapod-like two dimensional dichalcogenide NiSe2 for supercapacitor

“…The electrochemical performance of the supercapacitor is mainly reliant on the electrode material which triggers the research community to develop new electrodes with high energy density, power density and cycle life. Till date, such efforts have been achieved through novel two dimensional (2D) layered materials including graphene, reduced graphene oxides and chalcogenides [2][3][4][5]. In particular, 2D transition metal dichalcogenides (TMD) such as NiS 2 , CoS 2 , MoS 2 , VS 2 , WS 2 and MoSe 2 have been proved as high performance supercapacitor electrode materials [6][7][8][9][10][11].…”

Comparison of NiS2 and α-NiS hollow spheres for supercapacitors, non-enzymatic glucose sensors and water treatment

“…S6 and S7), which is also beneficial for Faradic reactions during the charge-discharge process. 40,53,54,55 The development of nonenzymatic glucose sensors with high sensitivity, fast response, and good stability has become one of the most attractive subjects of investigation in electrochemistry due to the practical applications. Transition metal sulfides materials by Please do not adjust margins Please do not adjust margins virtue of low cost, good electrocatalytic properties are of particular interest, which make them suitable for the electrochemical sensors.…”

“…Transition metal sulfides materials by Please do not adjust margins Please do not adjust margins virtue of low cost, good electrocatalytic properties are of particular interest, which make them suitable for the electrochemical sensors. 40,41,56 The possible mechanism for oxidation of glucose by the NiS 2 and -NiS hollow spheres materials could be represented by the following reactions: First, Ni 2+ could be electro-oxidized to Ni 3+ in alkaline solution, where the release of electron resulted in the formation of oxidation peak current. Then, glucose could be oxidized to gluconic acid by Ni 3+ , which was deoxidized to Ni 2+ at the same time.…”

“…The recent researches exhibit that many nano/microstructured materials have been successfully used for the construction of non-enzymatic glucose sensors, such as Ni, Cu, NiO, NiS and CuS materials, etc. [37][38][39][40][41] Furthermore, these nano/microstructured materials also exhibit good performance for the detection of glucose in the absence of enzyme. However, there are few reports on the fabrication of nonenzymatic glucose detectors based on Ni-based sulfides micro/nanomaterials.…”

Seed-induced synthesis of h-NiS single-crystalline hexagonal nanoparticles

“…The Ni-S system presents two stoichiometric NiS phases: one is the high-temperature h-NiS phase which has a hexagonal NiAs type structure, and the other is the low-temperature millerite phase (r-NiS) which displays a rhombohedral structure. Considered metastable, the h-NiS phase does not occur in nature [5] and has been synthetized and employed in modern technological applications such as supercapacitors [6,7]. It is usually chosen over r-NiS in electrochemical applications due to its better conductivity and stability in alkaline solutions [8,9].…”