In situ observation of Cu electrodeposition and dissolution behavior on Au(111) by high speed AFM
In situ observation of Cu electrodeposition and dissolution behavior on Au(111) by high speed AFM
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DOI：
10.1016/j.electacta.2019.02.044
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发表时间：
2019-04
影响因子：
6.6
通讯作者：
T. Yoshioka;H. Matsushima;M. Ueda
中科院分区：
文献类型：
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作者：
T. Yoshioka;H. Matsushima;M. Ueda
我们通过使用具有高时间分辨率的高速原子力显微镜 (HS-AFM) 研究了较宽的过电势范围内 Cu 在 Au(111) 上电沉积和溶解的早期阶段。 HS-AFM 图像揭示了一种瞬时成核机制，其中外延核是在低阴极过电位下产生的。具有直边缘的核是由 Au(111) 晶格的影响引起的，而拱形和不均匀边缘则与 Cu 吸附原子的快速结构波动有关。对于高过电势下形成的沉积物，许多细小的柱状沉积物覆盖整个表面平面，并且铜核的数量随着阴极过电势的增加而增加。这些特征都与公共交通有关。此外，我们观察到几纳米大小的小簇，在快速溶解过程后仍保留在基材上。
We studied the early stages of Cu electro-deposition and -dissolution on Au(111) over a wide overpotential regime by using high speed atomic force microscopy (HS-AFM) with a high temporal resolution. The HS-AFM images revealed an instantaneous nucleation mechanism where epitaxial nuclei were created at a low cathode overpotential. Nuclei with straight edges were caused by the influence of the Au(111) lattice, whereas arched and uneven edges were associated with rapid structural fluctuations of Cu adatoms. For deposits formed at a high overpotential, many fine column-like deposits covered the whole surface plane and the number of Cu nuclei increased with the cathode overpotential. These features were related to the masstransportation. Furthermore, we observed small clusters, a few nm in size, which remained on the substrate after the rapid dissolution process.