TY - JOUR
T1 - Nanocrystalline NiWO4-WO3-WO2.9 Composite Strings
T2 - Fabrication, Characterization and their Electrocatalytic Performance for Hydrogen Evolution Reaction
AU - Anis, Shaheen Fatima
AU - Mostafa, Ahmad O.
AU - Hilal, Nidal
AU - Hashaikeh, Raed
N1 - Funding Information:
The authors would like to thank Florent Ravaux, Masdar Institute, Khalifa University of Science and Technology for extending his help during TEM. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The authors declare that they have no conflicts of interest.
Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society and ASM International.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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 0.1 M KOH electrolytes. These composite strings showed good electrocatalytic activity compared to the NiWO4-WO3 fibers reported previously (Anis et al. in J. Mater. Sci. 52:7269–7281, 2017). 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 overpotentials as low as 40 and 50 mV in 0.5 M H2SO4 and 0.1 M KOH, respectively.
AB - 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 0.1 M KOH electrolytes. These composite strings showed good electrocatalytic activity compared to the NiWO4-WO3 fibers reported previously (Anis et al. in J. Mater. Sci. 52:7269–7281, 2017). 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 overpotentials as low as 40 and 50 mV in 0.5 M H2SO4 and 0.1 M KOH, respectively.
UR - http://www.scopus.com/inward/record.url?scp=85077058927&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85077058927&partnerID=8YFLogxK
U2 - 10.1007/s11661-019-05596-0
DO - 10.1007/s11661-019-05596-0
M3 - Article
AN - SCOPUS:85077058927
SN - 1073-5623
VL - 51
SP - 1264
EP - 1274
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 3
ER -