Controlling Pd Morphology in Electrodeposition from Nanoparticles to Dendrites via the use of Mixed Solvents

29 July 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


By changing the mole fraction of water (cwater) in the solvent acetonitrile (MeCN), we report a simple procedure to control nanostructure morphology during electrodeposition. We focus on the electrodeposition of palladium (Pd) on electron beam transparent boron-doped diamond (BDD) electrodes. Three solutions are employed MeCN rich (90% v/v MeCN, cwater = 0.246), equal volumes (50% v/v MeCN, cwater = 0.743) and water rich (10% v/v MeCN, cwater = 0.963) with electrodeposition carried out under diffusion-controlled conditions for fixed time periods (50, 150 and 300 s). Scanning transmission electron microscopy (STEM) reveals that in MeCN rich solution, Pd atoms, amorphous atom clusters and (majority) nanoparticles (NPs) result. As water content is increased, NPs are again evident but also elongated and defected nanostructures which grow in prominence with time. In the water rich environment, NPs and branched, concave and star-like Pd nanostructures are now seen, which with time translate to aggregated porous structures and ultimately dendrites. We attribute these observations to the role MeCN adsorption on Pd surfaces plays in retarding metal nucleation and growth.


Electrodeposition Process
transmission electron microscope imaging
Mixed Solvent System
single atom
boron doped diamond electrode

Supplementary materials

SI Pd edep from mixed solvents FINAL


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