Stochastic electrochemistry with electrocatalytic nanoparticles at inert ultramicroelectrodes-theory and experiments
Stochastic electrochemistry with electrocatalytic nanoparticles at inert ultramicroelectrodes-theory and experiments
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DOI：
10.1039/c0cp02543g
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Bard, Allen J.
中科院分区：
文献类型：
--
作者：
Kwon, Seong Jung;Zhou, Hongjun;Bard, Allen J.
通过电催化放大电流，观察到几种金属或金属氧化物单一纳米颗粒(NPs)与催化性能较差的电极表面发生碰撞。在粒子碰撞中可以看到两种常见的电流响应类型，电流阶梯或电流点(或尖峰)。电流响应是由作为时间函数的随机单个事件引起的，而不是由大量事件的集合引起的通常的连续电流。对随机电化学的处理，如单NP碰撞，不同于通常的基于系综的电化学行为模型。讨论了观测响应的模型，包括模拟，并对几个系统的阶跃或闪点的频率进行了实验研究。
Collisions of several kinds of metal or metal oxide single nanoparticles (NPs) with a less catalytic electrode surface have been observed through amplification of the current by electrocatalysis. Two general types of current response, a current staircase or a current blip (or spike) are seen with particle collisions. The current responses were caused by random individual events as a function of time rather than the usual continuous current caused by an ensemble of a large number of events. The treatment of stochastic electrochemistry like single NP collisions is different from the usual model for ensemble-based electrochemical behaviour. Models for the observed responses are discussed, including simulations, and the frequency of the steps or blips investigated for several systems experimentally.