Preparation of Nanoporous Cobalt-Iron Alloys From Samarium-Cobalt Magnet Scraps and the Performance Evaluation as the Oxygen Evolution Reaction Electrocatalysts

IF 6.1 3区材料科学 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Advanced Sustainable Systems Pub Date : 2025-06-24 DOI:10.1002/adsu.202500645

Yusheng Yang, Haotong Wang, Tianyi Yue, Liwen Liu, He Sun, Min Qiu, Milin Zhang

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Abstract

Samarium-cobalt (SmCo) magnets are available for critical use in aircraft, microwaves, magnetic couplings, missiles, and electrical engineering products. This work presents a new method for adeptly transforming SmCo scraps into oxygen evolution reaction (OER) catalysts, while recovering valuable elements. The SmCo scrap is directly electrochemically dealloyed in molten chloride to separate Pr, Sm, Cu, Fe, and Zr. The reaction process of SmCo scraps during dealloying is investigated by combining electrochemical techniques, ICP, XRD, and SEM-EDS. The valuable components Pr, Cu, Fe, and Zr are recovered with efficiencies exceeding 96%. The SmCo scraps formed a porous Co-Fe alloy after dealloying, and the porous alloy is found to be a candidate for OER catalysts. The relationship between dealloying parameters on the surface area and pore width of porous Co-Fe alloys is investigated. Both galvanostatic and potentiostatic methods are found to be suitable for preparing porous Co-Fe alloys with different characteristics.

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钐钴磁体废料制备纳米多孔钴铁合金及其析氧反应电催化剂性能评价

钐钴（SmCo）磁铁可用于飞机，微波，磁联轴器，导弹和电气工程产品的关键用途。提出了一种将SmCo废料转化为析氧反应（OER）催化剂，同时回收有价元素的新方法。SmCo废料直接在熔融氯化物中电解，分离出Pr、Sm、Cu、Fe和Zr。采用电化学技术、ICP、XRD、SEM-EDS等手段研究了SmCo渣在脱合金过程中的反应过程。有价组分Pr、Cu、Fe、Zr的回收率均超过96%。SmCo碎屑经脱合金处理后形成多孔Co-Fe合金，该多孔合金是OER催化剂的候选材料。研究了多孔Co-Fe合金表面脱合金参数与孔宽的关系。恒流法和恒电位法均适用于制备具有不同特性的多孔Co-Fe合金。

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来源期刊

Advanced Sustainable Systems Environmental Science-General Environmental Science

CiteScore

10.80

自引率

4.20%

发文量

186

期刊介绍： Advanced Sustainable Systems, a part of the esteemed Advanced portfolio, serves as an interdisciplinary sustainability science journal. It focuses on impactful research in the advancement of sustainable, efficient, and less wasteful systems and technologies. Aligned with the UN's Sustainable Development Goals, the journal bridges knowledge gaps between fundamental research, implementation, and policy-making. Covering diverse topics such as climate change, food sustainability, environmental science, renewable energy, water, urban development, and socio-economic challenges, it contributes to the understanding and promotion of sustainable systems.