Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 164, Issue 6, Pages D269-D274Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0131706jes
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Funding
- U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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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. 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. (C) 2017 The Electrochemical Society. All rights reserved.
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