Ultra-high supercapacitor NiSRu@NiO on nickel foam electrodes

What is it about?

Herein, a novel supercapacitor electrode is presented, fabricated through a solvothermal followed by an electrodeposition process. Specifically, a NiO nano-layer was initially developed on a nickel foam (NF) substrate through the solvothermal method, followed by a two-step electrodeposition process employing nickel, sulfur, and ruthenium precursors. The as-prepared electrode (NiSRu@NiO) exhibited excellent specific capacitance values of 1000 Fg−1 even at high current densities of 10 Ag−1, accompanied by excellent stability (98 %) after 3000 cycles. The high specific capacitance values can be attributed to the synergetic effect between the different counterparts of Ni, S, and Ru. This is clearly revealed via a thorough comparison of NiSRu@NiO electrodes with various mono- or bi-metallic compositions involving the employed metals (Ni, S, Ru) and through a comparison with state-of-the-art electrodes. Structural and morphological characterization was performed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), and field emission scanning microscopy (FE-SEM). The supercapacitor performance of the as-prepared electrode was investigated by cyclic voltammetry (CV), galvanostatic charge-discharge tests (GCD), electrochemical impedance spectroscopy (EIS), and cycling stability tests.

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Why is it important?

A novel supercapacitor electrode was fabricated through the solvothermal method followed by an electrodeposition process.