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Facile synthesis of reduced graphene oxide/Pt-Ni nanocatalysts: their magnetic and catalytic properties

机译：还原型氧化石墨烯/ Pt-Ni纳米催化剂的简便合成：其磁性和催化性能

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摘要

The catalytic performance of metals can be enhanced by intimately alloying different metals with Reduced Graphene Oxide (RGO). In this work, we have demonstrated a simplistic in situ one-step reduction approach for the synthesis of RGO/Pt-Ni nanocatalysts with different atomic ratios of Pt and Ni, without using any capping agent. The physical properties of the as-synthesized nanocatalysts have been systematically investigated by XRD, FTIR, Raman spectroscopy, XPS, EDX, ICP-AES, and TEM. The composition dependent magnetic properties of the RGO/Pt-Ni nanocatalysts were investigated at 5 and 300 K, respectively. The results confirm that the RGO/Pt-Ni nanocatalysts show a super-paramagnetic nature at room temperature in all compositions. Furthermore, the catalytic activities of the RGO/Pt-Ni nanocatalysts were investigated by analyzing the reduction of p-nitrophenol, and the reduction rate was found to be susceptible to the composition of Pt and Ni. Moreover, it has been found that RGO/Pt-Ni nanocatalysts show superior catalytic activity compared with the bare Pt-Ni of the same composition. Interestingly, the nanocatalysts can be readily recycled by a strong magnet and reused for the next reactions.
机译：通过将不同的金属与氧化石墨烯（RGO）紧密合金化，可以增强金属的催化性能。在这项工作中，我们展示了一种简单的原位一步还原方法，用于合成具有不同原子比的Pt和Ni的RGO / Pt-Ni纳米催化剂，而无需使用任何封端剂。通过XRD，FTIR，拉曼光谱，XPS，EDX，ICP-AES和TEM系统地研究了合成后的纳米催化剂的物理性质。分别在5 K和300 K下研究了RGO / Pt-Ni纳米催化剂的成分组成磁性。结果证实，RGO / Pt-Ni纳米催化剂在所有组合物中均在室温下表现出超顺磁性。此外，通过分析对硝基苯酚的还原反应，研究了RGO / Pt-Ni纳米催化剂的催化活性，发现还原速率对Pt和Ni的组成敏感。此外，已经发现，与相同组成的裸露Pt-Ni相比，RGO / Pt-Ni纳米催化剂显示出优异的催化活性。有趣的是，纳米催化剂可以很容易地被强磁体回收并再用于下一步反应。

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