A hierarchical NiCo₂S₄@2D-Carbyne nanohybrid as a supercapacitor electrode material exhibits the specific capacitance of 2507 F g⁻¹ at 1 A g⁻¹ as well as a non-enzymatic glucose sensor material exhibits a limit of detection of 34.5 μM with a sensitivity of about 135 μA mA⁻¹ cm⁻².

Abstract

Synthesising and designing pseudocapacitive material with good electrochemical and electrocatalytic behaviour is essential to use as supercapacitor as well as non-enzymatic glucose sensor electrode. In this work, NiCo₂S₄ nanoparticles decorated onto the 2D-Carbyne nanosheets are achieved by the solvothermal process. The as-prepared NiCo₂S₄@2D-Carbyne provides rich reaction sites and better diffusion pathways. On usage as an electrode for supercapacitor application, the NiCo₂S₄@2D-Carbyne exhibits the specific capacitance of about 2507 F g⁻¹ at 1 A g⁻¹. In addition, the fabricated hybrid device generates an energy density of 52.2 Wh kg⁻¹ at a power density of 1.01 kW kg⁻¹. Besides, the glucose oxidation behaviour of NiCo₂S₄@2D-Carbyne modified GCE has also been performed. The diffusion of glucose from the electrolyte to the electrode obeys the kinetic control process. Furthermore, the fabricated NiCo₂S₄@2D-Carbyne non-enzymatic glucose sensor exhibits a limit of detection of about 34.5 μM with a sensitivity of about 135 μA mM⁻¹ cm⁻². These findings highlight the need to design and synthesis electrode materials with adequate electrolyte-electrode contact, strong structural integrity, and rapid ion/electron transport.