Abdulaziz, R;
Brown, LD;
Inman, D;
Shearing, PR;
Brett, DJL;
(2017)
Electrochemical Reduction of Tungsten Oxide in LiCl-KCl Molten Salt Eutectic using the Fluidised Cathode Process.
Electrochimica Acta
, 226
pp. 18-28.
10.1016/j.electacta.2016.12.114.
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Abstract
The electrochemical reduction of WO3 to W metal using a fluidised cathode process has been investigated. Voltammetry was compared with thermodynamic predictions using a predominance diagram for the system to help explain the reaction mechanism. The main reduction potential was located to be −2.14 V vs. Ag/Ag+. By performing near-exhaustive electroreduction at constant potential, the Faradaic current efficiency was estimated to be >82%. The metal is produced in the form of homogeneous particles bound to the substrate electrode, which can periodically spall off. The effects of metal oxide-to-salt ratio and of fluidisation conditions on the process were investigated. Higher loading of metal oxide particles resulted in an increase in the rate of metallic deposit growth and less current ‘noise’, while the rate of reduction was relatively insensitive to flow rate of the Ar agitation gas feed, up to a limit where transition to a different flow regime is expected to be the cause of increased reaction rate.
| Type: | Article |
|---|---|
| Title: | Electrochemical Reduction of Tungsten Oxide in LiCl-KCl Molten Salt Eutectic using the Fluidised Cathode Process |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.electacta.2016.12.114 |
| Publisher version: | http://dx.doi.org/10.1016/j.electacta.2016.12.114 |
| Language: | English |
| Additional information: | © 2016 Elsevier Ltd. This manuscript version is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at https://creativecommons.org/licenses/. Access may be initially restricted by the publisher. |
| Keywords: | Fluidised cathode; molten salt; electrochemical reduction; tungsten oxide; LiCl-KCl eutectic |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1545045 |
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