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Ultralong PtNi alloy nanowires enabled by the coordination effect with superior ORR durability

机译：UltraLong PTNI合金纳米线通过具有优异的ORR耐用性的协调效应使能

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One-dimensional (1D) nanostructure with high aspect ratio is expected and experimentally proven as a promising candidate of catalysts with simultaneous high durability and efficiency. Due to the isotropic growth tendency of a face-centered cubic (fcc) structure and the complicated redox-alloying kinetics/thermodynamics; however, the synthesis of Pt-based bimetallic nanowires with a high aspect ratio remains a big challenge. In this study, we report the synthesis of ultralong PtNi nanowires via a surfactant-free method by taking advantage of the coordination effect to delicately control the reduction and alloying kinetics. The ORR electrocatalytic activities of the PtNi nanowires present a volcano-like trend depending on the Ni content with the Pt _(75) Ni _(25) nanowires at the peak position, which can be attributed to the optimized electronic structure on the basis of the XPS characterizations. The electrochemical catalytic comparison between the nanowires and nanopolyhedrons further highlights the superiority of the nanowires as a high durability catalyst. The successful application of the coordination effect method in the fabrication of PtCo nanowires indicates its universality for creating alloy nanowires.
机译：预期具有高纵横比的一维（1D）纳米结构，并以实验证明是具有同时高耐久性和效率的催化剂的有希望的候选者。由于面为中心的立方体（FCC）结构和复杂的氧化氧合金动力学/热力学的各向同性生长趋势;然而，具有高纵横比的Pt基的双金属纳米线的合成仍然是一个大挑战。在这项研究中，我们通过利用配位效应来通过无表面活性剂方法报告超朗PTNI纳米线的合成，以微小控制减少和合金化动力学。 PTNI纳米线的ORR电催化活性根据峰位置处的PT _（75）Ni _（25）纳米线的Ni含量呈现火山样趋势，该峰值位置可归因于优化的电子结构XPS特征。纳米线和纳米多孔之间的电化学催化比较进一步突出了纳米线作为高耐久性催化剂的优越性。协调效应法在PTCO纳米线制造中的成功应用表明其用于制造合金纳米线的普遍性。

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