Free-standing Ni-Co alloy nanowire arrays are synthesized via a modified template-assisted electrodeposition method. The structure and composition analysis have been performed by employing X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The highly ordered nanowire arrays show a strong adherence to an alloy transition layer. Herein, the alloy nanowire arrays show higher electrocatalytic activity in terms of lower onset potential and higher peak current density compared to the sample synthesized by conventional deposition route for urea electro-oxidation. Moreover, the electrocatalytic activity can be facilely optimized by selecting the length of nanowire arrays (or the deposition time). The best sample deposited with a time of 600 s possesses an onset oxidation potential of 0.372 V (vs. Hg/HgO) and a peak current density of 322.82 mA cm⁻² in 1 M KOH and 0.33 M urea solutions. The sample also shows good stability and activity even after sonication treatment. The excellent electrocatalytic properties of urea oxidation are considered due to the one-dimensional free-standing nanoscale alloy structure, which can largely boost the active sites, facilitate charge transfer, and improve the duration of urea electro-oxidation.

通过改进的模板辅助电沉积方法合成了独立式Ni-Co合金纳米线阵列。通过使用X射线衍射（XRD），扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）进行了结构和成分分析。高度有序的纳米线阵列显示出对合金过渡层的强粘附性。在本文中，与通过常规沉积途径合成的用于尿素电氧化的样品相比，合金纳米线阵列在较低的起始电势和较高的峰值电流密度方面显示出较高的电催化活性。而且，可以通过选择纳米线阵列的长度（或沉积时间）来容易地优化电催化活性。沉积时间为600 s的最佳样品具有0.372 V（vs.^-1在1 M KOH和0.33 M尿素溶液中。该样品甚至在超声处理后也显示出良好的稳定性和活性。一维自支撑的纳米级合金结构被认为是尿素氧化的优异电催化性能，它可以大大提高活性位点，促进电荷转移，并改善尿素电氧化的持续时间。