Sustainable platinum recycling through electrochemical dissolution of platinum nanoparticles from fuel cell electrodes

Raghunandan Sharma*, Kasper Rode Nielsen, Peter Brilner Lund, Søren Bredmose Simonsen, Laila Grahl-Madsen, Shuang Ma Andersen

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Abstrakt

Recycling of the platinum group metals (PGMs) containing industrial wastes obtained from proton exchange membrane fuel cells (PEMFCs), electrolyzers, catalytic convertors and others is of high strategical importance for industrial sustainability. In this work, a highly efficient and environmentally friendly platinum recycling method through potentiodynamic cycling in dilute acidic chloride solutions is demonstrated and optimized to recover platinum from fuel cell electrodes. The process parameters such as upper and lower potential limits are optimized to be 1.6 and 0.4 V vs. RHE. Both the dilute acidic and the acid free Cl‐ containing electrolytes may be used for the dissolution. Moreover, parameters such as protocol reliability, quantification method and comparison, electrode interface structure, dissolution product and mechanisms etc. are discussed. A study in 1 M HCl shows Pt dissolution rates as high as ~30 µg/cycle for potential cycling between 0.4 and 1.6 V (scan rate: 100 mV/s) for a PEMFC electrode with initial Pt loading of ~470 µg. The approach demonstrates a methodology for fast parameter screening on electrocatalyst dissolution and a proof of concept industrial recycling of spent electrocatalysts.
OriginalsprogEngelsk
TidsskriftChemElectroChem
Vol/bind6
Udgave nummer17
Sider (fra-til)4471-4482
ISSN2196-0216
DOI
StatusUdgivet - 2. sep. 2019

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