Recovery of Pt and Ru from Spent Low-Temperature Polymer Electrolyte Membrane Fuel Cell Electrodes and Recycling of Pt by Direct Redeposition of the Dissolved Precursor on Carbon

Raghunandan Sharma*, Saso Gyergyek, Peter Brilner Lund, Shuang Ma Andersen*

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

Recovery of platinum group metals (PGMs), namely, Pt and Ru, from a spent membrane electrode assembly (MEA) of a low-temperature polymer electrolyte membrane fuel cell (PEMFC) through environmentally benign and scalable processes is of significant interest and strategic importance for sustainable growth of the renewable energy industries. Here, we report such a scalable and simple process for recovery of Pt and Ru from the spent MEAs from low-temperature PEMFCs, consisting of the Pt and PtRu nanoparticles supported on carbon (Pt/C and PtRu/C) as the cathode and anode electrocatalysts, respectively. The Pt and Ru were recovered through refluxing the MEA components in a mixture of 1 M HCl and H2O2 (1.5% v/v) with a dissolution efficiency >95%. Furthermore, Ru was separated from the dissolution bath in the form of Ru-hydroxide precipitates, while Pt was redeposited on a carbon support to form the recycled Pt/C electrocatalyst. Unlike conventional Pt/C synthesis, where a Pt compound is used as the Pt precursor, the process uses the dissolved Pt directly and hence eliminates steps necessary to recover it in the form of a Pt compound. The synthesized Pt/C exhibits an electrochemical surface area, particle size, and durability comparable to that of the commercial counterpart. The study is of substantial interest for sustainable development of the PEMFC and other relevant industries utilizing nanoparticulate PGMs for different applications.

OriginalsprogEngelsk
TidsskriftACS Applied Energy Materials
Vol/bind4
Udgave nummer7
Sider (fra-til)6842–6852
ISSN2574-0962
DOI
StatusUdgivet - 26. jul. 2021

Bibliografisk note

Funding Information:
The authors acknowledge IRD fuel cells for supplying spent fuel cell materials and financial support by Innovation Fund Denmark, InnoExplorer program, Nr. 9122-00112, Danish Energy Agency EUDP project 3R, Nr. 64019-0551, EnergiFyn Udviklingsfond, and the Danish ESS lighthouse on hard materials in 3D, SOLID (grant number 8144-00002B). The authors also acknowledge the CENN Nanocenter for the use of their transmission electron microscope Jeol JEM-2100.

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