Synthesis of L10-Iron Triad (Fe, Co, Ni)/Pt Intermetallic Electrocatalysts via a Phosphide-Induced Structural Phase Transition,Advanced Materials

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Synthesis of L10-Iron Triad (Fe, Co, Ni)/Pt Intermetallic Electrocatalysts via a Phosphide-Induced Structural Phase Transition
Advanced Materials ( IF 27.4 ) Pub Date : 2022-11-23 , DOI: 10.1002/adma.202207995
Jingyu Guan _{1,

2} , Jianqi Zhang _{1,

2} , Xinliang Wang _{1,

2} , Zhengping Zhang _{1,

2} , Feng Wang _{1,

2}

Affiliation

Structurally ordered L1₀-iron triad (Fe, Co, Ni)/Pt with a M(iron triad)/Pt ratio ≈1:1 has drawn increasing attention in oxygen reduction reaction (ORR) electrocatalysis and fuel cell technologies by virtue of the high performance derived from their strong surface strain. However, the synthesis of intermetallic L1₀-M(iron triad)Pt generally requires the accurate content control of the multicomponent and the sufficient thermal energy to overcome the kinetic barrier for atom diffusion. This work reports a synthesis of sub ≈5 nm L1₀-intermetallic nanoparticles using phosphide intermediate-induced structural phase transition. Taking the L1₀-CoPt intermetallic, for example, the formation of the L1₀ structure depends on the Co₂P intermediates can provide abundant P vacancies to accelerate the Pt diffusion into the orthorhombic Co-rich skeletons, instead of the traditional route of intermetallic from solid solution. L1₀-CoPt prepared by this method has a high degree of ordering and shows the broad adaptability of various Pt-based electrocatalysts with different loading and states to improve their electrocatalytic performance. Additionally, the other L1₀-M(iron triad)Pt intermetallics, i.e., L1₀-NiPt and L1₀-FePt, are also prepared through this phosphide-induced phase transition. The findings provide a promising strategy for designing other intermetallic materials alloy materials using a structural phase transition induced by a second phase.

中文翻译：

通过磷化物诱导的结构相变合成 L10-铁三元组 (Fe、Co、Ni)/Pt 金属间电催化剂

结构有序的L 1 ₀ -铁三联体 (Fe, Co, Ni)/Pt，M（铁三联体）/Pt 比率≈1:1，在氧还原反应 (ORR) 电催化和燃料电池技术中引起了越来越多的关注，因为高性能源自其强大的表面应变。然而，金属间化合物L 1 ₀ - M （铁三联体）Pt的合成通常需要准确控制多组分的含量和足够的热能以克服原子扩散的动力学障碍。这项工作报告了 sub ≈5 nm L 1 ₀的合成-使用磷化物中间体诱导的结构相变的金属间纳米粒子。以L 1 ₀ -CoPt金属间化合物为例，L 1 ₀结构的形成依赖于Co ₂ P中间体可以提供丰富的P空位加速Pt向正交富Co骨架中的扩散，而不是传统路线来自固溶体的金属间化合物。该方法制备的L 1 ₀ -CoPt具有高度的有序性，显示出对不同负载量和状态的各种Pt基电催化剂的广泛适应性，以提高其电催化性能。此外，另一个L 1₀ - M（铁三联体）Pt 金属间化合物，即L 1 ₀ -NiPt 和L 1 ₀ -FePt，也是通过这种磷化物诱导的相变制备的。这些发现为使用第二相诱导的结构相变设计其他金属间材料合金材料提供了一种有前途的策略。

更新日期：2022-11-23

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