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Nanocrystalline NiWO4-WO3-WO2.9 Composite Strings: Fabrication, Characterization and their Electrocatalytic Performance for Hydrogen Evolution Reaction
Shaheen Fatima Anis, Ahmad O. Mostafa, Nidal Hilal, Raed Hashaikeh
Metallurgical and Materials Transactions A, Volume: 51, Issue: 3, Pages: 1264 - 1274
Swansea University Author: Nidal Hilal
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DOI (Published version): 10.1007/s11661-019-05596-0
In this study, novel nano crystalline composite strings made from mixed nickel-tungsten oxides (NiWO4-WO3-WO2.9) have been fabricated. The NiWO4-WO3 fibers produced by the electrospinning method were post treated in an argon atmosphere at 800°C which yielded NiWO4-WO3-WO2.9 nanocrystals attached tog...
|Published in:||Metallurgical and Materials Transactions A|
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In this study, novel nano crystalline composite strings made from mixed nickel-tungsten oxides (NiWO4-WO3-WO2.9) have been fabricated. The NiWO4-WO3 fibers produced by the electrospinning method were post treated in an argon atmosphere at 800°C which yielded NiWO4-WO3-WO2.9 nanocrystals attached together forming a string-like structure. The presence of WO2.9 phase was confirmed by both the XRD and TEM diffraction pattern analysis. String morphology and structure were found to change with different post treatment conditions such as by changing the calcination temperature from 550°C under oxygen to 800°C under pure argon atmosphere. This material was investigated for electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 and 0.1M KOH electrolytes. These composite strings showed good electrocatalytic activity compared to the NiWO4-WO3 fibers reported previously . It was concluded that the presence of WO2.9 phase increases the electrocatalytic activity of the catalyst as compared to the NiWO4-WO3 fibers with over potentials as low as 40 mV and 50 mV in 0.5 M H2SO4 and 0.1M KOH respectively.
Faculty of Science and Engineering