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Deposition of tungsten metal by an immersion process [electronic resource].

Published:
Washington, D.C. : United States. Office of Electricity Delivery & Energy Reliability, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages D269-D274 : digital, PDF file
Additional Creators:
Sandia National Laboratories, United States. Office of Electricity Delivery & Energy Reliability, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
A new multi-step, solution-phase method for the spontaneous deposition of tungsten from a room temperature ethereal solution is reported. This immersion process relies on the deposition of a sacrificial zinc coating which is galvanically displaced by the ether-mediated reduction of oxophilic WCl6. Subsequent thermal treatment renders a crystalline, metallic tungsten film. The chemical evolution of the surface and formation of a complex intermediate tungsten species is characterized by X-ray diffraction, infrared spectroscopy, and X-ray photoelectron spectroscopy. Efficient metallic tungsten deposition is first characterized on a graphite substrate and then demonstrated on a functional carbon foam electrode. The resulting electrochemical performance of the modified electrode is interrogated with the canonical aqueous ferricyanide system. A tungsten-coated carbon foam electrode showed that both electrode resistance and overall electrochemical cell resistance were reduced by 50%, resulting in a concomitant decrease in redox peak separation from 1.902 V to 0.783 V. Furthermore, this process promises voltage efficiency gains in electrodes for energy storage technologies and demonstrates the viability of a new route to tungsten coating for technologies and industries where high conductivity and chemical stability are paramount.
Report Numbers:
E 1.99:sand--2017-2433j
sand--2017-2433j
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Note:
Published through SciTech Connect.
03/23/2017.
"sand--2017-2433j"
"651492"
Journal of the Electrochemical Society 164 6 ISSN 0013-4651 AM
Leo J. Small; Michael T. Brumbach; Paul G. Clem; Erik David Spoerke.
Funding Information:
AC04-94AL85000
View MARC record | catkey: 24056882