Regulation of oxygen reduction reaction by the magnetic effect of L10-PtFe alloy
Regulation of oxygen reduction reaction by the magnetic effect of L10-PtFe alloy
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L1(0)-PtFe合金磁效应调控氧还原反应
DOI：
10.1016/j.apcatb.2020.119332
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发表时间：
2020-12-05
影响因子：
22.1
通讯作者：
Yao, Jiannian
中科院分区：
文献类型：
--
作者：
Lu, Fei;Wang, Jian;Yao, Jiannian
重要的是通过将Pt与第一行过渡金属（M：例如，Fe、Co、Ni）。已知配体、应变和系综效应控制ORR性能。然而，PtMs的内禀磁特性在ORR研究中很少被关注。在这里，我们采用硬磁L1（0）有序的PtFe纳米柱膜（L1（0）-PtFe NF）作为模型催化剂，以揭示催化剂的磁效应对ORR。我们报道了磁化的L1（0）-PtFe（M）NF的催化效率比未磁化的提高了5倍。进一步的研究表明，催化剂表面化学吸附氧的覆盖度，特别是Pt d（yz）-O-2 pi ~* 主偶联，受催化剂磁场的控制，是ORR调控的关键因素。因此，这项工作铺平了道路，实现磁效应的精确调控，在广泛的催化应用。
It is important to improve the oxygen reduction reaction (ORR) performance of Pt by alloying it with first-row transition metals (M: e.g., Fe, Co, Ni). It is known that the ligand, strain, and ensemble effects govern the ORR performance. However, the intrinsic magnetic characteristics of PtMs have rarely been focused on in ORR investigations. Here, we employed a hard-magnet L1(0)-ordered PtFe nanopillar film (L1(0)-PtFe NF) as model catalyst to uncover the catalyst's magnetic effect on the ORR. We report a five-fold enhancement of the catalytic efficiency of magnetized L1(0)-PtFe(M) NF compared with unmagnetized one. Further investigations demonstrate that the coverage of chemisorbed oxygen on catalyst surface, especially the primary Pt d(yz)-O-2 pi* coupling, manipulated by the catalyst's magnetic field is the key factor for the ORR regulation. This work thus paves the way for the implementation of magnetic effect towards the precise regulation in broad catalysis applications.