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Research Article | Open Access

Phase transfer-based high-efficiency recycling of precious metal electrocatalysts

Qing Zenga, Shaonan Tiana, Yu Zhanga, Hui Liua, Dong Chena( ), Xinlong Tianb ( ), Chaoquan Hua,c, Jun Yanga,c,d( )
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan Provincial Key Lab of Fine Chemistry, School of Chemical Engineering and Technology, Hainan University, Haikou, 570228, China
Nanjing IPE Institute of Green Manufacturing Industry, Nanjing, 211100, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
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HIGHLIGHTS

● Recycling precious metals is beneficial to optimize the resource utilization.

● Phase transfer-based efficient recycling of Pd and Pt electrocatalysts.

● High transfer efficiency and recovery rate for the electrocatalysts in each cycle.

● The recycled Pd and Pt are highly active towards typical electrochemical reactions.

Graphical Abstract

Abstract

Recycling precious metals with high-efficiency is undoubtedly beneficial to optimize resource utilization for environmental remediation and sustainable development. Herein, we report an efficient route to recycle the palladium (Pd) and platinum (Pt) electrocatalysts using a phase transfer method. This strategy involves acidic dissolution of deactivated precious metal (Pd/Pt) electrocatalysts from their loading substrates, mixing with an ethanolic solution of dodecylamine (DDA), subsequent extraction of metal ions into a non-polar organic phase, and final reduction by sodium borohydride to reproduce high-performance electrocatalysts towards typical electrochemical reactions, e.g., oxygen reduction reaction (ORR) and ethanol oxidation reaction (EOR). In specific, the transfer efficiencies are up to 98% and the final recovery rate is over 85% for Pd and Pt electrocatalysts in each cycle. This approach symbolizes a facile and efficient way to recover precious metals, which might be applied to recycling a wide range of metals in various realms after appropriate modifications.

Keywords

Precious metalPhase transferExtractionRecoveryElectrocatalyst

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Green Chemical Engineering
Volume 5 Issue 1,
March 2024
Pages 68-74
DOI: 10.1016/j.gce.2022.10.001
Cite this article:
Zeng Q, Tian S, Zhang Y, et al. Phase transfer-based high-efficiency recycling of precious metal electrocatalysts. Green Chemical Engineering, 2024, 5(1): 68-74. https://doi.org/10.1016/j.gce.2022.10.001

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Received: 06 September 2022
Revised: 10 October 2022
Accepted: 17 October 2022
Published: 19 October 2022
© 2022 Institute of Process Engineering, Chinese Academy of Sciences.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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