Structure Design Reveals the Role of Au for ORR Catalytic Performance Optimization in PtCo‐Based Catalysts,Advanced Functional Materials

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Structure Design Reveals the Role of Au for ORR Catalytic Performance Optimization in PtCo‐Based Catalysts
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-04-06 , DOI: 10.1002/adfm.202001575
Li‐Ming Guo ₁ , Dong‐Feng Zhang ₁ , Lin Guo ₁

Affiliation

Au‐incorporation is a promising strategy to retard composition‐loss in Pt‐based catalyst. However, the unclear mechanism limits guided catalyst design and the performance optimization. Here, direct evidence is provided to validate the outward diffusion of Au atoms in Au‐core/Pt‐based‐shell structures. A Co interlayer is built between the Au‐core and PtCo‐based shell to exclude the possibility of atomic diffusion caused by interfacial alloying. In conjunction with the improved catalytic durability of the Au‐core@Pt‐based‐shell structure, it is reasonable to conclude that it is the subsurface segregated Au atoms rather than interfacial interaction that boosts the catalytic durability of Au‐core/Pt‐based‐shell structured catalysts towards oxygen reduction reaction. More importantly, by constructing Au‐core@Co‐interlayer@PtCoAu‐shell multilayer structure, the specific (1.730 mA cm⁻²) and mass (0.692 A mg⁻¹_Pt) activities are enhanced 7‐ and 4‐ fold relative to the commercial Pt/C. After 10 000 cycles of accelerated durability test, the mass activity loss for the multilayered catalyst is as low as 6.14% while the loss exceeds 35% for the commercial Pt/C catalyst. The improved catalytic performance of the Au@Co@PtCoAu multilayer structure can be ascribed to the finely modulated electronic structure and the compensated composition loss owing to the delicate structure and composition profile design.

中文翻译：

结构设计揭示了Au在基于PtCo的催化剂中ORR催化性能优化中的作用

Au掺入是降低Pt基催化剂成分损失的一种有前途的策略。然而，不清楚的机制限制了导向催化剂的设计和性能的优化。在这里，提供了直接的证据来验证Au核/ Pt基壳结构中Au原子的向外扩散。在Au核芯和PtCo壳之间建立了Co中间层，以排除由于界面合金化而导致原子扩散的可能性。结合改善的Au-core @ Pt-基壳结构的催化耐久性，可以合理地得出结论，是表面下分离的Au原子而不是界面相互作用提高了Au-core / Pt-基的催化耐久性。壳结构催化剂，用于氧还原反应。更重要的是，^-2）和质量（0.692 A mg ^-1_Pt）活性相对于市售Pt / C分别提高了7倍和4倍。在10000次加速耐久性测试循环之后，多层催化剂的质量活度损失低至6.14％，而商用Pt / C催化剂的质量活度损失超过35％。Au @ Co @ PtCoAu多层结构的改进的催化性能可以归因于精细调制的电子结构和由于精细的结构和组成轮廓设计而补偿的组成损失。

更新日期：2020-04-06

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