Studies of the electrodeposition of platinum metal from a hexachloroplatinic acid bath

Yasin, Hartini M.; Denuault, Guy; Pletcher, Derek

doi:10.1016/j.jelechem.2009.06.020

Cited by 64 publications

(56 citation statements)

References 38 publications

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“…Therefore, Ru can be taken as a much more noble metal than Co, but the reduction of the Ru 3+ ion is much hindered, similarly to the reduction of Pt 2+ ions [8].…”

Section: Introductionmentioning

confidence: 99%

Anomalous codeposition of cobalt and ruthenium from chloride–sulfate baths

Fesharaki

Nabiyouni

Dégi

et al. 2011

J Solid State Electrochem

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Continuous deposits could be obtained only when the molar fraction of Co in the deposit was at least 40 at.%. The deposit morphology was related to the molar fraction of Co in the deposit. The X-ray diffractograms are in conformity with a hexagonal close-packed alloy and indicate the formation of nanocrystalline deposits. Two-pulse plating did not lead to a multilayer but to a Corich alloy. Magnetoresistance of the samples decreased with increasing Ru content.

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“…Therefore, Ru can be taken as a much more noble metal than Co, but the reduction of the Ru 3+ ion is much hindered, similarly to the reduction of Pt 2+ ions [8].…”

Section: Introductionmentioning

confidence: 99%

Anomalous codeposition of cobalt and ruthenium from chloride–sulfate baths

Fesharaki

Nabiyouni

Dégi

et al. 2011

J Solid State Electrochem

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“…It is interesting to note that unlike in strong iodide solutions, in which Pt II species have a wide region of stability and can be observed during experiments as a bright yellow complex, Yasin et al [26] did not detect Pt II species as stable intermediates in 0.1 M chloride. This is The competing cathode reactions of tri-iodide reduction, oxygen reduction, and hydrogen evolution were also modelled, again using Butler-Volmer kinetic equations.…”

Section: Reactor Electrochemical Performance Simulationmentioning

confidence: 96%

“…Besides the data reported previously by the present authors [2], we are unaware of any other studies of Pt deposition from iodide solutions having been published. However, the nucleation and growth kinetics of Pt from chloride onto vitreous carbon was also found to be slow [26], and inter alia due to competition between adsorbed halogen species and the deposition of Pt. Iodine/tri-iodide absorption on Pt is known to be strong [27][28][29] and so it very likely to have contributed to the slow kinetics exhibited.…”

Section: Reactor Electrochemical Performance Simulationmentioning

confidence: 99%

Recovery of platinum from secondary materials: electrochemical reactor for platinum deposition from aqueous iodide solutions

Dawson

Kelsall

2016

J Appl Electrochem

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A circulating bed particulate reactor was designed, developed, and demonstrated to facilitate recovery of dilute dissolved platinum species from concentrated aqueous iodide solutions, an essential component for the overall process proposed for the recovery of Pt from secondary materials using benign conditions. A detailed design for the reactor was undertaken using the Fluent TM computational fluid dynamics software to predict electrolyte and particulate flows, and Maple TM for simulating the electrochemical performance. Insight was gained into the design features required for successful operation and demonstrated in the reactor design, including effects of electrolyte flow rate, additional inlet nozzle locations, bed depth in the direction of current flow, draft tube width, and its proximity to the inlet nozzle. Good agreement was found between the reactor model predictions and the results of the experimental matrix conducted to define the reactor performance. The electrodeposit produced by the reactor was found to be adherent even under transport controlled operation, supporting the assertion that mechanical interactions in a circulating particulate bed can improve deposit morphologies in transport and mixed controlled deposition regimes. The model predictions and the experimental results both showed that the reactor could be operated with charge yields of ca. 45 %, corresponding to specific electrical energy consumptions of ca. 1.0 kWh kg -1 Pt and hence negligible operating cost compared with the value of the product. Graphical abstractKeywords Iodide Á Platinum Á Circulating particulate bed electrode Á Tri-iodide Á Secondary materialsDiffusion coefficient for species i in solution (m

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“…The precursor solution and electrolyte consisted of 2.5 mM H 2 PtCl 6 and 0.5 M H 2 SO 4 . H 2 PtCl 6 was chosen as precursor salt because its high water solubility and previously gave good results for ED [42]. The commonly reported voltage ranges for platinum ED (−0.2 to 0 V vs RHE) often with a minimum negative potential where hydrogen evolution starts [42,43], led to extremely low platinum loading.…”

Section: Oxidation Of Carbon Support and Pt Electro-depositionmentioning

confidence: 99%

“…H 2 PtCl 6 was chosen as precursor salt because its high water solubility and previously gave good results for ED [42]. The commonly reported voltage ranges for platinum ED (−0.2 to 0 V vs RHE) often with a minimum negative potential where hydrogen evolution starts [42,43], led to extremely low platinum loading. Hence, lower potentials were chosen in order to improve platinum loading: ED was performed by a voltage pulse of −0.4 V vs. RHE for 60 s, while at rest the voltage was kept at 0.8 V vs. RHE in order to avoid electroless deposition.…”

Section: Oxidation Of Carbon Support and Pt Electro-depositionmentioning

confidence: 99%