Abstract

Hydrogen permeation through a pure palladium film (25 m thickness, optically dense) is employed to trigger electron transfer (hydrogen-driven) reactions at the external palladium | aqueous electrolyte interface of a two-compartment electrochemical cell. Two systems are investigated to demonstrate feasibility for (i) indirect hydrogen-mediated silver electrodeposition with externally applied potential and (ii) indirect hydrogen-mediated silver electrodeposition driven by external formic acid decomposition. In both cases, porous metal deposits form as observed by optical and electron microscopies. Processes are self-limited as metal deposition blocks the palladium surface and thereby slows down further hydrogen permeation. The proposed methods could be employed for a wider range of metals and they could provide an alternative (non-electrochemical or indirect) procedure for metal removal or metal recovery processes or for indirect metal sensing.
Original languageEnglish
JournalJournal of Solid State Electrochemistry
Early online date17 Apr 2020
DOIs
Publication statusE-pub ahead of print - 17 Apr 2020

Keywords

  • Dendritic silver
  • Indirect electrodeposition
  • Metal recovery
  • Palladium membrane
  • Porous silver
  • Reduction by hydrogen

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this