Particles collision onto a surface or an interface is a novel electrochemical approach, which can be used to investigate the behavior of single entities. Benefiting from advantages including single particle/single event resolution, label‐free detection and high sensitivity, this technique has been widely employed in the study of electrocatalytic amplification of detection signal by nanoparticles. Herein, we report the investigation of the collisional electrocatalytic behaviors of novel Pd−Ag hyperbranched nanoparticles through the observation of catalysis of hydrogen peroxide (H₂O₂) oxidation. The newly prepared Pd−Ag hyperbranched nanoparticles have been characterized by cyclic voltammetry and surface techniques. They can obviously reduce the overpotential of the reduction of H₂O₂ and show the high electrocatalytic activity. When the nanoparticles collide onto the electrode via the Brownian random motion, electrocatalytic reaction occurs and results in significant current increases, which could provide information about nanoparticles and electrochemical reactions. Furthermore, concentration and potential dependence are also investigated in detail, which confirms the reliability and universality of this methodology as an ultra‐sensitive probe. Based on these results, it is clearly shown that such platform is promising in further applications for biosensing and single nanoparticle analysis.

中文翻译：

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基于碰撞法的Pd-Ag纳米粒子电催化还原过氧化氢

粒子碰撞到表面或界面上是一种新颖的电化学方法，可用于研究单个实体的行为。受益于单颗粒/单事件分辨率，无标记检测和高灵敏度等优点，该技术已广泛用于纳米颗粒对检测信号的电催化放大研究。本文中，我们通过观察过氧化氢（H ₂ O ₂）氧化的催化作用，研究了新型Pd-Ag超支化纳米颗粒的碰撞电催化行为。新制备的Pd-Ag超支化纳米颗粒已经通过循环伏安法和表面技术进行了表征。它们显然可以减少H还原的过电位₂ O ₂并显示出高的电催化活性。当纳米粒子通过布朗随机运动碰撞到电极上时，会发生电催化反应并导致电流显着增加，这可以提供有关纳米粒子和电化学反应的信息。此外，还对浓度和电位依赖性进行了详细研究，这证实了该方法作为超灵敏探针的可靠性和通用性。基于这些结果，清楚地表明，该平台在生物传感和单个纳米颗粒分析的进一步应用中很有希望。