Closing the loop: life cycle assessment and optimization of a PEMFC platinum-based catalyst recycling process,Green Chemistry

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Closing the loop: life cycle assessment and optimization of a PEMFC platinum-based catalyst recycling process
Green Chemistry ( IF 9.3 ) Pub Date : 2020/02/10 , DOI: 10.1039/c9gc03630j
Lucien Duclos _{1,

2,

3,

4,

5} , Raphaël Chattot _{1,

2,

3,

4,

5} , Laetitia Dubau _{1,

2,

3,

4,

5} , Pierre-Xavier Thivel _{1,

2,

3,

4,

5} , Guillaume Mandil _{1,

3,

6,

7,

8} , Valérie Laforest _{9,

10,

11,

12,

13} , Marco Bolloli _{1,

14,

15,

16,

17} , Rémi Vincent _{1,

14,

15,

16,

17} , Lenka Svecova _{1,

2,

3,

4,

5}

Affiliation

This study is focused on the development of an environmentally friendly recycling method for selective recovery in a closed loop manner of Co and Pt from a Pt₃Co/C catalyst used as the proton exchange membrane fuel cell (PEMFC) cathode. Pt and Co selective separation was carried out using two different hydrometallurgical alternatives based either on ion exchange resin or solvent extraction. The recycling process was optimized in order to maximize the platinum recovery yield, which reached 85% and 78% of the Pt initially present in the membrane-electrode assembly (MEA) using respectively solvent extraction or ion exchange resin separation alternatives. The recovered platinum alkaline solutions have been further used for Pt/C particle synthesis via a modified polyol method and it was shown that although the resin alternative resulted in a slightly lower recovery yield, the catalyst prepared via this alternative had satisfactory morphological and electrochemical properties for the oxygen reduction reaction (ORR) by performing similar to a commercial state-of-art Pt/C catalyst. The feasibility of the closed loop Pt/C catalyst recycling was thus proven. The environmental impacts of the two recycling alternatives have been compared using the life cycle assessment methodology (LCA) and similar impacts have been found for both alternatives from the point of view of the entire MEA life cycle. The ion exchange resin alternative has thus been selected as the most appropriate one.

中文翻译：

闭环：生命周期评估和PEMFC铂基催化剂回收工艺的优化

这项研究的重点是开发一种环境友好的回收方法，用于以闭环方式从用作质子交换膜燃料电池（PEMFC）阴极的Pt ₃ Co / C催化剂中选择性回收Co和Pt 。基于离子交换树脂或溶剂萃取，使用两种不同的湿法冶金学方法对Pt和Co进行了选择性分离。为了使铂的回收率最大化，对回收过程进行了优化，以分别使用溶剂萃取或离子交换树脂分离替代品，达到最初存在于膜电极组件（MEA）中的Pt的85％和78％。将回收的铂碱性溶液已被进一步用于的Pt / C颗粒合成经由一种改进的多元醇方法，结果表明，尽管树脂替代品的回收率略低，但通过这种替代品制备的催化剂，其氧化还原反应（ORR）具有令人满意的形态和电化学性能，其反应类似于工业化生产。先进的Pt / C催化剂。因此证明了闭环Pt / C催化剂再循环的可行性。已使用生命周期评估方法（LCA）比较了这两种回收替代品对环境的影响，从整个MEA生命周期的角度来看，这两种替代品对环境的影响也相似。因此已选择离子交换树脂替代品作为最合适的替代品。

更新日期：2020-03-24

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