Characteristics of anode materials for nickel electroforming

Green, Todd and Tambe, Christine Enowmbi and Roy, Sudipta (2022) Characteristics of anode materials for nickel electroforming. Journal of the Electrochemical Society, 169 (9). 092510. ISSN 0013-4651 (https://doi.org/10.1149/1945-7111/ac8ee9)

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Abstract

This study comprised an investigation of the characteristics of commercial nickel anode materials routinely employed in sulfamate-based electroforming processes. These included examples of sulfur depolarised anodes containing a relatively high sulfur content and those with much lower levels. Electrochemical studies indicate that the sulfur depolarised anodes underwent dissolution in the active region and were capable of sustaining large current densities at low potentials without passivating, and with current efficiencies approaching 100%. In contrast, low-sulfur containing anodes could only sustain low current densities in the active region, and were prone to passivation. These materials could only undergo high rate dissolution in the transpassive region, but this required relatively high anode potentials and was accompanied by various side reactions which lowered the current efficiency. Additional studies were performed to characterise the sulfamate oxidation products which generates a distinct UV absorption band at 245 nm. These species were produced only when low-sulfur content or inert (platinum) anodes were used, and were absent when sulfur depolarised anodes were employed. The principal anode product was azodisulfonate, but trace amounts of other sulfonate species and sulfur-containing anions may also be present.

ORCID iDs

Green, Todd ORCID logoORCID: https://orcid.org/0000-0002-3538-5217, Tambe, Christine Enowmbi ORCID logoORCID: https://orcid.org/0000-0002-1257-6213 and Roy, Sudipta ORCID logoORCID: https://orcid.org/0000-0002-3399-035X;
  • Item type:Article
    ID code:82249
    Dates:
    Date
    Event
    9 September 2022
    Published
    2 September 2022
    Published Online
    31 August 2022
    Accepted
    21 June 2022
    Submitted
    Notes:Accepted manuscript first published online 2 September 2022 under a CC BY 3.0 licence. Version of Record first published online 9 September 2022 under a CC BY 4.0 licence.
    Subjects:Technology > Chemical engineering
    Science > Physics
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:07 Sep 2022 12:30
    Last modified:21 Nov 2024 01:22
    URI:https://strathprints.strath.ac.uk/id/eprint/82249
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