Interfacial Dynamics of Dendrite Electrodeposition

Dale Barkey 9306837这是一项关于电沉积金属枝晶自发生长的研究。对枝晶的萌生和扩展进行了实验和理论研究，重点研究了界面动力学。金属/溶液界面的实验研究主要集中在原始条件下的成核和生长，并具有高空间分辨率。理论部分将这些界面过程与宏观结构的出现和生长速度联系起来。实验技术包括伏安法、电化学阻抗谱、原子力和扫描隧道显微镜，以及包括阴影成像和全息干涉测量在内的光学方法。用单晶电极和针状电极研究了晶体各向异性和曲率对沉积动力学的影响。在包括电化学处理、储能和金属精加工在内的电沉积技术中，枝晶的自发生长往往是时空产量的限制因素。(例如，它是汽车电池故障的主要原因。)本研究试图将微观界面过程与宏观枝晶的出现和生长联系起来。重点是在电镀、储能(电池)和结构材料方面具有商业意义的金属。

Dale Barkey 9306837 This is a study of the spontaneous growth of electrodeposited metal dendrites. Both experimental and theoretical investigations of the initiation and propagation of dendrites are included, with emphasis on interfacial dynamics. Experimental studies of the metal/solution interface focus on nucleation and growth under pristine conditions with high spatial resolution. The theoretical component relates these interfacial processes to the appearance of macroscopic structure and to growth velocity. Experimental techniques include voltammetry, electrochemical impedance spectroscopy, atomic force and scanning tunnelling microscopies, and optical methods including shadowgraph imaging and holographic interferometry. Single-crystal electrodes and needle electrodes are used to examine the effects of crystalline anisotropy and curvature on the deposition dynamics. Spontaneous growth of dendrites is often the limiting factor for space-time yields in technologies using electrodeposition, including electrochemical processing, energy storage, and metal finishing. (For example, it is the principal cause of failure in automotive batteries.) This study is an attempt to relate microscopic interfacial processes with the appearance and growth of macroscopic dendrites. The emphasis is on metals of commercial significance in plating, energy storage (batteries), and structural materials.