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PRODID:-//Memento EPFL//
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SUMMARY:Electrochemical study of electrodeposition process
DTSTART:20170915T110000
DTEND:20170915T120000
DTSTAMP:20260510T183457Z
UID:f77e8124935a7c0fdf4277e07a09cca67a2a3bf710295837a0d2ba76
CATEGORIES:Conferences - Seminars
DESCRIPTION:Jie Zhang\n\nClean Energy Materials Laboratory in MSE Departme
 nt\, Southern University of Science and Technology\, China\n\n	Copper elec
 troplating in aqueous solution\n\nAlthough it is very detrimental to the o
 perators and our environment\, cyanide copper electroplating bath is still
  broadly used nowadays. In order to replace the cyanide bath\, we develope
 d and investigated an alkaline cyanide-free bath containing 5\, 5’- dime
 thylhydantoin (DMH) and citrate as the complex agents for copper electrode
 position. Bright copper electrodeposits with good adhesion on steel substr
 ates were obtained from the newly developed solution. Cyclic voltammetry(C
 V) study indicated that electrodeposition process was mainly controlled by
  DMH. Electrochemical kinetics parameters were obtained from sample curren
 t voltammetry method. Molecular dynamic (MD) simulation unveiled the adsor
 ption of DMH on iron and copper surfaces. The morphology as the function o
 f solution composition was revealed by scanning electron microscopy (SEM).
 \n\n\n	Electrodeposition of gallium\, indium\, and copper in ionic liquid\
 n\nThe electrodeposition process of gallium\, copper\, and indium in an io
 nic liquid solution was investigated to lay a foundation for the electrode
 position of CIGS alloy films\, which is the key layer of one of the most p
 romising types of solar cell\, namely the CIGS solar cell. Results of CV d
 isplayed that both temperature and electrode material had a great influenc
 e on the electroreduction kinetics of Ga3+ ions in 1-Butyl-3-methylimidazo
 lium trifluoromethanesulfonate ([BMIM][TfO]) ionic liquid. The diffusion c
 oefficients of Ga3+ ions were obtained through three methods involving rot
 ating disk electrode. Non-linear fitting theoretical function to the curre
 nt transients from chronoamperometry\, combined with SEM images of the ini
 tial deposition stage on GCE\, unveiled the nucleation process. The effect
  of potential and temperature on the morphology of gallium deposits was re
 vealed by SEM images. Similar methods were employed to investigate the ele
 ctrodeposition process of indium and copper in the same ionic liquid. One 
 interesting thing was that octahedral indium particles were obtained\, whi
 ch might be related to the interaction between [BMIM][TfO] and the differe
 nt oriented surfaces of indium according to the results of MD simulation.\
 n 
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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