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首页> 外文期刊>Chemistry: A European journal >Porous Ni@Pt core-shell nanotube array electrocatalyst with high activity and stability for methanol oxidation
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Porous Ni@Pt core-shell nanotube array electrocatalyst with high activity and stability for methanol oxidation

机译：高活性，高稳定性的多孔Ni @ Pt核壳纳米管阵列催化剂

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摘要

Bimetallic core-shell nanostructures are emerging as more important materials than monometallic nanostructures, and have much more interesting potential applications in various fields, including catalysis and electronics. In this work, we demonstrate the facile synthesis of core-shell nanotube array catalysts consisting of Pt thin layers as the shells and Ni nanotubes as the cores. The porous Ni@Pt core-shell nanotube arrays were fabricated by ZnO nanorod-array template-assisted electrodeposition, and they represent a new class of nanostructures with a high electrochemically active surface area of 50.08 m ~2 (g Pt) ~(-1), which is close to the value of 59.44 m ~2 (g Pt) ~(-1) for commercial Pt/C catalysts. The porous Ni@Pt core-shell nanotube arrays also show markedly enhanced electrocatalytic activity and stability for methanol oxidation compared with the commercial Pt/C catalysts. The attractive performances exhibited by these prepared porous Ni@Pt core-shell nanotube arrays make them promising candidates as future high-performance catalysts for methanol electrooxidation. The facile method described herein is suitable for large-scale, low-cost production, and significantly lowers the Pt loading, and thus, the cost of the catalysts. A new electrocatalyst: Porous Ni@Pt core-shell nanotube arrays were synthesized by the template-directed electrodeposition method, and were found to exhibit highly enhanced electrocatalytic activity toward methanol oxidation (see figure). This is attributed to a combination of several favorable factors: the electronic, strain, and synergistic effects among the various elements, and the special hollow and porous structures in the nanotube arrays.
机译：与单金属纳米结构相比，双金属核-壳纳米结构正在作为更重要的材料出现，并且在包括催化和电子学在内的各个领域中具有更有趣的潜在应用。在这项工作中，我们证明了由Pt薄层作为壳层和Ni纳米管作为核层组成的核-壳纳米管阵列催化剂的简便合成。 ZnO纳米棒阵列模板辅助电沉积法制备了多孔Ni @ Pt核壳纳米管阵列，代表了一种新型的纳米结构，具有高的电化学活性表面积为50.08 m〜2（g Pt）〜（-1） ），接近商用Pt / C催化剂的59.44 m〜2（g Pt）〜（-1）值。与市售Pt / C催化剂相比，多孔Ni @ Pt核壳纳米管阵列还显示出明显增强的电催化活性和对甲醇氧化的稳定性。这些制备的多孔Ni @ Pt核壳纳米管阵列表现出的诱人性能使其成为有前途的候选物，可作为未来甲醇电氧化的高性能催化剂。本文所述的简便方法适用于大规模，低成本的生产，并且显着降低了Pt负载量，并因此降低了催化剂的成本。通过模板定向电沉积法合成了一种新型的电催化剂：多孔Ni @ Pt核壳纳米管阵列，发现其对甲醇氧化的电催化活性大大增强（见图）。这归因于几个有利因素的组合：各种元素之间的电子，应变和协同效应，以及纳米管阵列中的特殊空心和多孔结构。

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