Thursday, 2 June 2022: 16:40
West Meeting Room 114 (Vancouver Convention Center)
The anomalous codeposition of Ni-Fe tends to develop a composition gradient zone along the growth direction within the near-substrate region. Although it has been shown that such a composition gradient can be mitigated by the pulsed deposition method, a fundamental understanding of this behavior based on the anomalous codeposition mechanism has not been achieved yet. In this work, the evolution of the composition and the morphology during the (pulsed) electrodeposition of Ni-Fe films was reported. A theory based on the Fe deposition mechanism originally described by Bockris, Drazic, and Despic [1] was proposed and described in detail, which was used to rationalize not only the occurrence and the decline of the composition gradient, but also the opposite signs of the composition gradient observed under the potentiostatic mode and the pulse-reverse potential mode.
[1] O’M. Bockris, D. Drazic, A. R. Despic, The Electrode Kinetics of the Deposition and Dissolution of Iron, Electrochimica Acta 4, no. 2 (1961) 325–361.