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Indirect (hydrogen-driven) electrodeposition of porous silver onto a palladium membrane |
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| Authors: | Kanyanee Tinakorn Fletcher Philip J. Madrid Elena Marken Frank |
| Affiliation: | 1.Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK ;2.Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand ;3.Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai, 50200, Thailand ;4.Materials and Chemical Characterisation Facility (MC2), University of Bath, Claverton Down, Bath, BA2 7AY, UK ; |
| Abstract: | Hydrogen permeation through a pure palladium film (25 μm 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.  Graphical abstract |
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