Solid-phase diffusion controlled growth of nickel silicide nanowires for supercapacitor electrode

Ramly, Mohammad Mukhlis and Omar, Fatin Saiha and Rohaizad, Aliff and Aspanut, Zarina and Rahman, Saadah Abdul and Goh, Boon Tong (2018) Solid-phase diffusion controlled growth of nickel silicide nanowires for supercapacitor electrode. Applied Surface Science, 456. pp. 515-525. ISSN 0169-4332

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This work reports on the influence of nickel (Ni) thickness on the growth of nickel silicide nanowires (NiSi NWs) using a solid-phase diffusion controlled growth treatment. The NiSi NWs were grown on two different substrates (i.e. crystal silicon (c-Si) and Ni foil) which were coated with Ni film with different thicknesses; 110 ± 5 and 220 ± 5 nm. FESEM images revealed that the shape, the size and the density of NiSi on both substrates were strongly dependent on the thickness of Ni film. These NWs exhibited morphology of straight NWs with diameter and length of between 16 to 23 nm and 2.9 to 3.9 µm, respectively. The NWs showed a single-crystalline Ni 3 Si 2 phase with a preferred orientation in the (1 0 0) plane. XRD diffractogram proved that the formation of Ni-rich NiSi NWs is strongly dependent on the Ni film's thickness rather than on the types of substrates. NiSi NF220 demonstrated the highest specific capacity with a maximum value of 313.3 C/g. This is attributed from the high density of NWs which endows more redox reaction and the high conductivity of Ni foil substrate that facilitated the high charge transfer kinetics. The fabricated NiSi NWs//activated carbon-based asymmetric supercapacitor exhibited the maximum energy density of 13.37 W h/kg at 200 W/kg and good cyclic stability with 79% capacity retention after 3000 cycles.

Item Type: Article
Uncontrolled Keywords: NiSi; Nanowires; Solid-phase diffusion control; FESEM; Supercapacitor
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Apr 2019 02:43
Last Modified: 16 Apr 2019 02:43

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