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Research Article

Molybdenum-Tungsten carbides based electrocatalysts for hydrogen evolution reaction

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Pages 91-102 | Received 23 Jun 2022, Accepted 29 Jan 2023, Published online: 10 Feb 2023

Figures & data

Figure 1. XRD patterns of (a) Ni-WC, Co-WC and NiCo-WC; (b) Ni-MoC, Co-MoC and NiCo-MoC.

Figure 1. XRD patterns of (a) Ni-WC, Co-WC and NiCo-WC; (b) Ni-MoC, Co-MoC and NiCo-MoC.

Table 1. Estimated crystallite sizes and lattice strains of the transition metal carbides.

Figure 2. SEM images and EDS spectra of Ni-WC (a, d), Co-WC (b, e), NiCo-WC (c, f), Ni-MoC (g, j), Co-MoC (h, k), NiCo-MoC (i, l).

Figure 2. SEM images and EDS spectra of Ni-WC (a, d), Co-WC (b, e), NiCo-WC (c, f), Ni-MoC (g, j), Co-MoC (h, k), NiCo-MoC (i, l).

Figure 3. High-resolution XPS spectra of C 1s, Ni 2p and Co 2p, Mo 3d and W 4f.

Figure 3. High-resolution XPS spectra of C 1s, Ni 2p and Co 2p, Mo 3d and W 4f.

Figure 4. Multiple scans of the CVs of the modified TiO2 electrodes in 1.0 M NaOH solution.

Figure 4. Multiple scans of the CVs of the modified TiO2 electrodes in 1.0 M NaOH solution.

Figure 5. Polarisation curves of the (a) WC-based and (b) MoC-based electrocatalysts.

Figure 5. Polarisation curves of the (a) WC-based and (b) MoC-based electrocatalysts.

Table 2. Electrocatalytic parameters of the studied electrocatalysts for HER.

Figure 6. Tafel plots of the (a) WC- based and (b) MoC-based electrocatalysts.

Figure 6. Tafel plots of the (a) WC- based and (b) MoC-based electrocatalysts.

Figure 7. Catalytic durability curves of (a) WC- based and (b) MoC-based electrocatalysts.

Figure 7. Catalytic durability curves of (a) WC- based and (b) MoC-based electrocatalysts.