Formation of Nanostructured Gold Sponges by Anodic Dealloying. EIS Investigation of Product and Process
✍ Scribed by S. Cattarin; D. Kramer; A. Lui; M. Musiani
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 278 KB
- Volume
- 9
- Category
- Article
- ISSN
- 1615-6846
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✦ Synopsis
Abstract
Gold sponges are prepared by anodic leaching of silver from Ag~75~Au~25~ alloy sheets in 1 mol L^—1^ HClO~4~ solutions. EIS investigations performed after exhaustive dissolution, under blocking conditions, show classical porous behaviour and a capacity, increasing with dissolution potential, in the range of 3–10 F g^—1^. The observed time decrease of capacity is consistent with the occurrence of slow coarsening phenomena. EIS investigations performed during dissolution show a faradaic process in parallel with capacitive charging of the metal sponge, and a much larger capacity. The phenomena are discussed and a simulation is presented, based on a set of plausible parameters.