Intermetallic PtCu Nanoframes as Efficient Oxygen Reduction Electrocatalysts.,Nano Letters

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Intermetallic PtCu Nanoframes as Efficient Oxygen Reduction Electrocatalysts.
Nano Letters ( IF 9.6 ) Pub Date : 2020-09-14 , DOI: 10.1021/acs.nanolett.0c02812
Ho Young Kim ₁ , Taehyun Kwon ₂ , Yoonhoo Ha ₃ , Minki Jun ₂ , Hionsuck Baik ₄ , Hu Young Jeong ₅ , Hyungjun Kim ₃ , Kwangyeol Lee ₂ , Sang Hoon Joo _{1,

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Affiliation

Nanoframe alloy structures represent a class of high-performance catalysts for the oxygen reduction reaction (ORR), owing to their high active surface area, efficient molecular accessibility, and nanoconfinement effect. However, structural and chemical instabilities of nanoframes remain an important challenge. Here, we report the synthesis of PtCu nanoframes constructed with an atomically ordered intermetallic structure (O-PtCuNF/C) showing high ORR activity, durability, and chemical stability. We rationally designed the O-PtCuNF/C catalyst by combining theoretical composition predictions with a silica-coating-mediated synthesis. The O-PtCuNF/C combines intensified strain and ligand effects from the intermetallic PtCu L1₁ structure and advantages of the nanoframes, resulting in superior ORR activity to disordered alloy PtCu nanoframes (D-PtCuNF/C) and commercial Pt/C catalysts. Importantly, the O-PtCuNF/C showed the highest ORR mass activity among PtCu-based catalysts. Furthermore, the O-PtCuNF/C exhibited higher ORR durability and far less etching of constituent atoms than D-PtCuNF/C and Pt/C, attesting to the chemically stable nature of the intermetallic structure.

中文翻译：

金属间PtCu纳米框架作为高效氧还原电催化剂。

纳米框架合金结构由于其高的活性表面积，有效的分子可及性和纳米限制作用，代表了用于氧还原反应（ORR）的一类高性能催化剂。然而，纳米框架的结构和化学不稳定性仍然是重要的挑战。在这里，我们报告与原子有序的金属间结构（O -PtCuNF / C）构成的PtCu纳米框架的合成显示出高ORR活性，耐久性和化学稳定性。通过将理论组成预测与二氧化硅涂层介导的合成相结合，我们合理地设计了O -PtCuNF / C催化剂。所述Ô -PtCuNF / C联合收割机加剧应变和配体从金属间PtCu L1效果₁纳米框架的结构和优势，从而使无序合金PtCu纳米框架（D -PtCuNF / C）和市售Pt / C催化剂具有更出色的ORR活性。重要的是，在基于PtCu的催化剂中，O- PtCuNF / C显示出最高的ORR质量活性。此外，与D -PtCuNF / C和Pt / C相比，O -PtCuNF / C表现出更高的ORR耐久性和更少的组成原子蚀刻，证明了金属间结构的化学稳定性。

更新日期：2020-10-15

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