Core/shell Cu/FePtCu nanoparticles with face-centered tetragonal texture: An active and stable low-Pt catalyst for enhanced oxygen reduction
Core/shell Cu/FePtCu nanoparticles with face-centered tetragonal texture: An active and stable low-Pt catalyst for enhanced oxygen reduction
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DOI：
10.1016/j.nanoen.2018.10.034
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发表时间：
2018-12
期刊：
影响因子：
17.6
通讯作者：
Xu Chen;Hanbin Wang;Houzhao Wan;Tianci Wu;Danqing Shu;Laifa Shen;Yi Wang;P. Ruterana;P. Lund-P.
中科院分区：
文献类型：
--
作者：
Xu Chen;Hanbin Wang;Houzhao Wan;Tianci Wu;Danqing Shu;Laifa Shen;Yi Wang;P. Ruterana;P. Lund-P.
低铂基纳米晶在氧还原反应(ORR)中显示出高活性催化剂的潜力，但它们存在结构退化的问题。因此，优化它们的表面和界面结构以调节它们的催化活性和稳定性是非常具有挑战性的。本文采用一锅法在320 °C下制备了面心四方相的核壳结构的铜/铁铅铜纳米粒子。优化后的核壳结构的富铂催化剂Fe45Pt35Cu20的活性为0.5mgPtass/ A，比商品铂碳催化剂(0.13 A/mgPT)提高了4倍。此外，经过1000次循环后，催化剂的电流密度仅下降了3.0%，远好于铂/C(34.2%的衰减率)。利用像差校正的扫描电子显微镜和原子分辨元素图谱，可以清楚地解释FePtCu合金和核壳结构Cu/FePtCu之间的形态和结构演变。这项工作表明，有序和核壳结构的FePtCu催化剂在ORR和其他电化学过程中具有很好的应用前景。
Low-Pt based nanocrystals demonstrate potential as highly active catalysts for the oxygen reduction reaction (ORR), but they suffer from undesirable structural degradation. Therefore, it is highly challenging to optimize their surface and interfacial structures to tune their catalytic properties for both activity and stability. Here core–shell Cu/FePtCu nanoparticles with a face-centered-tetragonal phase are prepared by a facile one–pot polyol method at 320 °C. The optimized core–shell Fe45Pt35Cu20catalyst with Pt-enriched surface exhibits 0.5 A/mgPtmass activity, which is a factor of 4 better than that of commercial Pt/C (0.13 A/mgPt). In addition, the current density of the catalyst drops only 3.0% after 1000 cycles, which is much better than Pt/C (34.2% decay). Using aberration-corrected scanning transmission electron microscopy and atomically resolved elemental mapping, the morphology and structure evolving between the FePtCu alloy and core–shell Cu/FePtCu could clearly be explained. This work demonstrates that an ordered and core–shell FePtCu catalyst is highly promising for ORR and other electrochemical processes.