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Tuning the composition of gold-silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

机译：调整金银双金属纳米粒子的组成，用于电化学减少过氧化氢和硝基苯

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摘要

This paper reports the synthesis of gold-silver bimetallic nanoparticles (Au-AgNPs) with different Ag : Au compositions in an aqueous medium and their attachment on a glassy carbon electrode (GCE) via a 1,6-hexadiamine (HDA) linker for the electrochemical reduction of hydrogen peroxide (HP) and nitrobenzene (NB). Initially, silver nanoparticles (AgNPs) were synthesized by the reduction of silver nitrate using trisodium citrate as a capping agent and sodium borohydride as a reducing agent. Then, the Au-AgNPs were prepared by the galvanic displacement of Ag(0) by AuCl4- ions. The composition of the Au-AgNPs was varied by changing the mole ratio of Ag : Au in the range of 1 : 0 to 1 : 0.16. TEM images show that the Au-AgNPs were spherical in shape with a diameter of similar to 16 nm. The prepared colloidal solution of Au-AgNPs were then attached on a HDA modified GCE through the Michael's addition reaction and were confirmed by UV-vis diffuse reflectance spectroscopy (DRS), atomic force microscopy (AFM), line scanning analysis, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The AFM image shows that the Au-AgNPs were densely packed on the electrode surface. The AuAgNPs modified electrode exhibits a higher heterogeneous electron transfer rate constant of 2.77 x 10(-7) cm s(-1) when compared to Ag and AuNPs modified electrodes. Furthermore, the electrocatalytic activity of the Au-AgNPs modified electrode was examined by studying the reduction of HP and NB. It was found that the Au-AgNPs with the Ag : Au mole ratio of 1 : 0.12 showed excellent electrocatalytic activity towards the reduction of both HP and NB by not only shifting their reduction potentials toward less negative potentials but also enhanced their currents compared to the bare GCE, Ag and AuNPs modified electrodes and Au-AgNPs of other molar ratios. The present modified electrode shows the limit of detection of 0.12 and 0.23 mM (S/N = 3) for HP and NB, respectively.
机译：本文报道了用不同Ag的金银双金属纳米颗粒（Au-Agnps）的合成：Au组合物在水性介质中，并通过1,6-己二胺（HDA）接头在玻璃状碳电极（GCE）上的附件过氧化氢（HP）和硝基苯（Nb）的电化学还原。最初，通过使用柠檬酸三钠作为覆盖剂和硼氢化钠作为还原剂来减少银纳米颗粒（AgNP）。然后，通过AuCl 4-离子通过Ag（0）的电催化位移来制备Au-AgNP。通过改变Ag的摩尔比为1：0至1：0.16的Ag的摩尔比改变Au-agnps的组成。 TEM图像表明，Au-agnps的形状为球形，直径与16nm相似。然后通过Michael的加成反应将制备的Au-agnps的胶体溶液连接在HDA改性的GCE上，并通过UV-Vis弥射反射光谱（DRS），原子力显微镜（AFM），线扫描分析，循环伏安（CV ）和电化学阻抗光谱（EIS）。 AFM图像表明Au-agnps密集地填充在电极表面上。与AG和AUNPS改性电极相比，AuAGNPS改性电极显示出2.77×10（-7）cm s（-1）的更高的异质电子传递速率常数。此外，通过研究Hp和Nb的还原，检查Au-agnps修饰电极的电催化活性。发现具有Ag的Au-agnps：au moly比率为1：0.12，朝向减少HP和Nb的优异的电催化活性，不仅使其降低的潜力延伸到更少的负势，而且与...相比增强了它们的电流。裸GCE，AG和AUNPS改性电极和其他摩尔比的Au-agnps。本修改的电极分别显示出HP和NB的检测限为0.12和0.23mm（s / n = 3）。

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  • 来源
    《RSC Advances》 |2016年第68期|共12页
  • 作者

    Gowthaman N. S. K.; Sinduja Bharathi; John S. Abraham;

  • 作者单位

    Gandhigram Rural Inst Dept Chem Ctr Nanosci &

    Nanotechnol Dindigul 624302 Tamil Nadu India;

    Gandhigram Rural Inst Dept Chem Ctr Nanosci &

    Nanotechnol Dindigul 624302 Tamil Nadu India;

    Gandhigram Rural Inst Dept Chem Ctr Nanosci &

    Nanotechnol Dindigul 624302 Tamil Nadu India;

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  • 正文语种 eng
  • 中图分类 化学;
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