1. Molybdenum-Tungsten carbides based electrocatalysts for hydrogen evolution reaction.
- Author
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Mabuea, Busisiwe Petunia, Erasmus, Elizabeth, and Swart, Hendrik Christoffel
- Subjects
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OXYGEN evolution reactions , *HYDROGEN evolution reactions , *ELECTROCATALYSTS , *X-ray photoelectron spectroscopy , *ELECTRON spectroscopy , *SCANNING electron microscopy , *CYCLIC voltammetry - Abstract
Tungsten carbide-based nano-catalysts (Ni-WC, Co-WC and NiCo-WC) and molybdenum carbide-based nano-catalysts (Ni-MoC, Co-MoC and NiCo-MoC) were synthesised using a carbothermal reduction method. X-ray diffraction, scanning electron microscopy coupled with electron dispersive spectroscopy, x-ray photoelectron spectroscopy and cyclic voltammetry were used to evaluate the prepared electrocatalysts. The cyclic voltammetry results showed that Ni-WC coated electrode displayed the best hydrogen evolution reaction catalytic activity with the lowest overpotential of 1.421 V at a current density of 10 mA cm−2, and a Tafel slope of 135 mV dec−1 which is marginally lower than the benchmark Pt/C coated electrodes. Ni-MoC and Co-MoC coated electrocatalysts also produced current more effectively with a change in potential as compared to the Pt/C coated electrode. The durability test showed Co-WC, NiCo-WC and Ni-MoC coated electrodes to have high stability within a wide range of current densities. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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