Abstract

The synthesis of well-defined copper core-silver shell nanowire by a modified hydrothermal method followed by immersion coating process is reported here. The HRTEM image of the individual Cu–Ag core-shell nanowire successfully demonstrates that the silver nanocrystals were effectively deposited over the surface of Cu nanowires, resulting in a core-shell structure by the immersion coating process. The catalytic performance of the prepared copper core-silver shell nanowires with different ratios have been investigated by taking the reduction of para nitrophenol to para aminophenol in presence of sodium borohydride as the model reaction. The Cu–Ag core-shell nanowires show remarkable catalytic activity toward the reduction of p-nitrophenol at room temperature with a maximum apparent rate constant value of 0.216 min⁻¹. In comparison with the monometallic copper nanowires, the Cu–Ag core-shell nanowires exhibit 3.5 times enhancement in the catalytic performance and good recyclability for at least three cycles of the reduction reaction.

Graphic abstract

Copper core-silver shell nanowire: a potential catalyst for the reduction of paranitrophenol was developed by a modified hydrothermal method followed by immersion coating process. Remarkable catalytic activity with a maximum apparent rate constant value of 0.216 min⁻¹ was obtained. The use of eco-friendly reducing agent and the high purity synthetic approach makes this work significant.

中文翻译：

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Cu-Ag核壳纳米线催化剂增强的还原反应

摘要

本文报道了通过改进的水热方法，然后采用浸涂方法合成定义明确的铜芯-银壳纳米线。单个Cu-Ag核-壳纳米线的HRTEM图像成功地表明，银纳米晶体有效地沉积在Cu纳米线的表面上，通过浸涂工艺形成了核-壳结构。以硼氢化钠存在下对硝基苯酚还原为对氨基苯酚为模型反应，研究了不同比例制备的铜核-银壳纳米线的催化性能。Cu–Ag核壳纳米线在室温下表现出显着的催化对硝基苯酚还原的活性，最大表观速率常数值为0.216 min ^-1。与单金属铜纳米线相比，Cu-Ag核壳纳米线在至少三个还原反应循环中的催化性能提高了3.5倍，并具有良好的可回收性。

图形摘要

铜芯-银壳纳米线：通过改进的水热法，然后采用浸涂工艺，开发了一种用于还原对硝基苯酚的潜在催化剂。获得了显着的催化活性，其最大表观速率常数值为0.216min ^-1。使用环保型还原剂和高纯度合成方法使这项工作意义重大。