Control of Growth Front Evolution by Bi Additives during ZnAu Electrodeposition

Jeung Hun Park, Nicholas M. Schneider, Daniel Artemus Steingart, Hariklia Deligianni, Suneel Kodambaka, Frances M. Ross

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The performance of many electrochemical energy storage systems can be compromised by the formation of metal dendrites during charging. Additives in the electrolyte represent a useful strategy to mitigate dendrite formation, but understanding the mechanisms involved requires knowledge of the nanoscale effects of additives during electrochemical deposition. Here we quantify the effects of an inorganic additive on the morphology of an evolving electrochemical growth front, using liquid cell electron microscopy to provide the necessary spatial and temporal resolution. We examine deposition of ZnAu on Au in the presence of Bi additive, and show that low concentrations of Bi delay but do not prevent the formation of growth front instabilities. We describe a model in which Bi segregates at the growth front and promotes the surface diffusion and relaxation of Zn, allowing better coverage of the initial Au electrode surface. A more precise knowledge of the mechanism of inorganic additive effects may help in designing electrolyte chemistry for battery and other applications where morphology control is essential.

Original languageEnglish (US)
Pages (from-to)1093-1098
Number of pages6
JournalNano Letters
Volume18
Issue number2
DOIs
StatePublished - Feb 14 2018

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • Dendrites
  • additives
  • electrochemistry
  • energy storage
  • in situ electron microscopy
  • liquid cell electron microscopy

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