Journal Article

FZJ-2016-05704

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Platinum recycling going green via induced surface potential alteration enabling fast and efficient dissolution

Hodnik, N. (Corresponding author) ; Baldizzone, C. ; Polymeros, G. ; Geiger, S. ; Grote, J.-P. ; Cherevko, S.FZJ* ; Mingers, A. ; Zeradjanin, A.FZJ* ; Mayrhofer, K. (Corresponding author)FZJ*

2016
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/12910  doi:10.1038/ncomms13164

Abstract: The recycling of precious metals, for example, platinum, is an essential aspect of sustainability for the modern industry and energy sectors. However, due to its resistance to corrosion, platinum-leaching techniques rely on high reagent consumption and hazardous processes, for example, boiling aqua regia; a mixture of concentrated nitric and hydrochloric acid. Here we demonstrate that complete dissolution of metallic platinum can be achieved by induced surface potential alteration, an ‘electrode-less’ process utilizing alternatively oxidative and reductive gases. This concept for platinum recycling exploits the so-called transient dissolution mechanism, triggered by a repetitive change in platinum surface oxidation state, without using any external electric current or electrodes. The effective performance in non-toxic low-concentrated acid and at room temperature is a strong benefit of this approach, potentially rendering recycling of industrial catalysts, including but not limited to platinum-based systems, more sustainable.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 134 - Electrolysis and Hydrogen (POF3-134) (POF3-134)
2. 152 - Renewable energy and material resources for sustainable futures - Integrating at different scales (POF3-152) (POF3-152)

Appears in the scientific report 2016

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