期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 265, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.124472
关键词
Platinum recycling; Electrocatalyst; Platinum dissolution; Microwave synthesis
资金
- IRD fuel cells, Denmark
- Innovation Fund Denmark [9122-00112]
- Danish Energy Agency EUDP project 3R [64019-0551]
- Danish ESS lighthouse on hard materials in 3D, SOLID [8144-00002B]
This study reports a recycling process for recovering Pt from spent PEMFC electrodes through dissolution under mild conditions and synthesis of Pt/C using the recovered Pt, eliminating the steps required for conventional Pt compound synthesis. The synthesized Pt/C was characterized for its structure and electrochemical performance, showing potential interest for the PEMFC industry relying on Pt/C electrocatalyst demand.
Nanoparticulate platinum supported on high surface area carbon (Pt/C) remains the electrocatalyst of choice at the cathode of the low-temperature polymer electrolyte membrane fuel cell (PEMFCs). Recycling of the Pt/C from the spent PEMFC electrodes through environment-friendly and economic processes is of high industrial significance. Here, we report such a Pt/C recycling process involving recovery of Pt from spent PEMFC electrodes through dissolution under mild conditions followed by synthesis of Pt/C using the Pt containing dissolution bath as the Pt source. Prior to recycling, the spent PEMFC electrodes were characterized for the physical and chemical states of Pt nanoparticles (size, agglomeration, surface adsorbed species, electrochemical surface area, etc.), owing to their influence on the Pt dissolution under mild conditions. Pt from the spent electrode was recovered through dissolution in 1 M HCl and the Pt/C catalyst (20 wt% Pt) was synthesized by reduction of the dissolved Pt species using microwave assisted polyol route and ethylene glycol as the reducing agent. The process eliminates the steps necessary to recover the dissolved Pt in form of a Pt compound suitable for conventional Pt/C synthesis (e.g. H2PtCl6). The synthesized Pt/C was characterized for its structure and electrochemical performance. The study may be of interest for the PEMFC industry, which relies on the primary sources of Pt for their Pt/C electrocatalyst demand.
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