Potential-dependent current traces were first observed for the same sized nanoparticles (NPs) during the dynamic electro-oxidation process of single AgNPs. In this work, we demonstrated that the motion trajectories of NPs, coupled with electrochemical kinetics parameters, qualitatively predicted from the series of the experimentally observed current traces obtained single AgNPs collision behaviors. Based on the Poisson–Boltzmann equation for a general electrochemical reaction, a rate constant of Ag oxidation could be further estimated to be 1 × 10^–6 mol·cm^–2·s^–1 for electron transfer between AgNPs and the Au electrode by comparing the experimental results. Our method provided a meaningful attempt to test electron transfer kinetics and motion behaviors of single NPs using the high-resolution electrochemical signal.

中文翻译：

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单银纳米粒子电氧化：电位依赖的电流迹线和电位独立的电子转移动力学。

在单个AgNPs的动态电氧化过程中，首先观察到了相同大小的纳米粒子（NPs）的电位依赖性电流迹线。在这项工作中，我们证明了从一系列实验观察到的电流迹定性地预测了NPs的运动轨迹以及电化学动力学参数，从而获得了单个AgNPs的碰撞行为。根据一般电化学反应的Poisson–Boltzmann方程，可以进一步估计Ag氧化的速率常数为1×10 ^–6 mol·cm ^–2 ·s ^–1通过比较实验结果证明AgNPs和Au电极之间的电子转移。我们的方法提供了有意义的尝试，以使用高分辨率电化学​​信号测试单个NP的电子转移动力学和运动行为。