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
Pages (from-to)2789-2796
JournalJournal of Solid State Electrochemistry
Early online date17 Apr 2020
Publication statusPublished - 30 Nov 2020


  • 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


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