Kinetics of Monolayer Bi Electrodeposition on Au(111): Surface X-ray Scattering and Current Transients
Kinetics of Monolayer Bi Electrodeposition on Au(111): Surface X-ray Scattering and Current Transients
复制标题
Au(111) 上单层 Bi 电沉积动力学：表面 X 射线散射和电流瞬变
DOI：
10.1021/jp0368435
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发表时间：
2004
影响因子：
3.3
通讯作者：
B. Ocko
中科院分区：
文献类型：
--
作者：
K. Tamura;J. X. Wang;and R. R. Adžic;B. Ocko
用表面X射线散射和电化学方法研究了Bi在Au（111）电极上单层电沉积（欠电位沉积）的动力学。使用电位响应时间小于50 μs的低电阻液滴电池同时测量电流和X射线强度瞬态。获得了Bi覆盖瞬态的三个独立测量值，它们与（1）积分电荷，（2）吸附的Bi（与吸附位点无关）和（3）具有明确定义的（2×2）结构的吸附Bi有关。零覆盖参与公度（2×2）-Bi相变发生在毫秒级时间尺度上，比（2×2）-Bi参与公度-覆盖非公度（p× 3）-2Bi相变快3个数量级。成核和生长动力学，观察到这两个过渡，涉及Bi解吸。Langmuir吸附动力学观察到的两个过渡涉及Bi吸附。总覆盖率与.测量的覆盖率的比较
The kinetics of Bi monolayer electrodeposition (underpotential deposition) on the Au(111) electrode was investigated using surface X-ray scattering and electrochemical methods. The current and X-ray intensity transients were measured simultaneously using a low-resistance drop cell that has a potential response time less than 50 μs. Three independent measurements of the Bi coverage transients were obtained, which are related to (1) the integrated charge, (2) the adsorbed Bi, irrespective of the adsorption site, and (3) the adsorbed Bi with a well-defined (2×2) structure. The zero-coverage ↔ commensurate (2×2)-Bi phase transition occurs on the millisecond time scale, 3 orders of magnitude more rapidly than the (2×2)-Bi ↔ high-coverage incommensurate (p×√3)-2Bi phase transition. Nucleation and growth kinetics was observed for both transitions involving Bi desorption. Langmuir adsorption kinetics was observed for both transitions involving Bi adsorption. Comparison of the total coverage with that measured by ...