Transient Voltammetry at Electrodes Modified with a Random Array of Spherical Nanoparticles: Theory
Transient Voltammetry at Electrodes Modified with a Random Array of Spherical Nanoparticles: Theory
复制标题
用球形纳米粒子随机阵列修饰的电极的瞬态伏安法：理论
DOI：
10.1021/jp1015388
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Belding S
中科院分区：
文献类型：
--
作者：
Belding S
简单的单电子还原，A + e−⇌ B，是在附着在平面电极上的球形纳米粒子的随机阵列上进行研究的。假定电子转移仅发生在纳米颗粒的表面；电极仅充当导电支撑件。使用有限差分法的交替方向隐式 (ADI) 变体来模拟伏安法。研究了扩散控制计时电流响应作为纳米颗粒表面覆盖度的函数，并且研究了循环伏安法作为电化学速率常数、电压扫描速率和纳米颗粒表面覆盖度的函数。还考虑了球形纳米粒子的随机阵列可以在多大程度上有效地近似为具有相等表面覆盖率的圆盘阵列。
The simple one-electron reduction, A + e−⇌ B, is studied at a random array of spherical nanoparticles attached to a planar electrode. Electron transfer is assumed to occur exclusively on the surface of the nanoparticles; the electrode simply acts as a conductive support. Voltammetry is simulated using the alternating direction implicit (ADI) variant of the finite difference method. The diffusion-controlled chronoamperometric response is studied as a function of nanoparticle surface coverage, and the cyclic voltammetry is studied as a function of electrochemical rate constant, voltage scan rate, and nanoparticle surface coverage. Also considered is the extent to which a random array of spherical nanoparticles can usefully be approximated as an array of discs with an equal surface coverage.