Pulse electrodeposition of platinum catalyst using different pulse current waveforms

Karimi, Shahram; Foulkes, F. R.

doi:10.1016/j.elecom.2012.02.043

Cited by 20 publications

(11 citation statements)

References 13 publications

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“…This clustering nature is only observable at higher magnifications, as can be seen by comparison between Figure (×100 magnification) and Figures and (×3500 and ×20000 magnification, respectively). Such a growth mechanism correlates with that previously reported in literature for platinum electrodeposition experiments. − …”

Section: Resultssupporting

confidence: 91%

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Halli

Heikkinen

Elomaa

et al. 2018

ACS Sustainable Chem. Eng.

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In the current study, platinum—present as a negligible component (below 1 ppb, the detection limit of the HR-ICP-MS at the dilutions used) in real industrial hydrometallurgical process solutions—was recovered by an electrodeposition–redox replacement (EDRR) method on pyrolyzed carbon (PyC) electrode, a method not earlier applied to metal recovery. The recovery parameters of the EDRR process were initially investigated using a synthetic nickel electrolyte solution ([Ni] = 60 g/L, [Ag] = 10 ppm, [Pt] = 20 ppm, [H2SO4] = 10 g/L), and the results demonstrated an extraordinary increase of 3 × 105 in the [Pt]/[Ni] on the electrode surface cf. synthetic solution. EDRR recovery of platinum on PyC was also tested with two real industrial process solutions that contained a complex multimetal solution matrix: Ni as the major component (>140 g/L) and very low contents of Pt, Pd, and Ag (i.e., <1 ppb, 117 and 4 ppb, respectively). The selectivity of Pt recovery by EDRR on the PyC electrode was found to be significant—nanoparticles deposited on the electrode surface comprised on average of 90 wt % platinum and a [Pt]/[Ni] enrichment ratio of 1011 compared to the industrial hydrometallurgical solution. Furthermore, other precious metallic elements like Pd and Ag could also be enriched on the PyC electrode surface using the same methodology. This paper demonstrates a remarkable advancement in the recovery of trace amounts of platinum from real industrial solutions that are not currently considered as a source of Pt metal.

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Section: Resultssupporting

confidence: 91%

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Halli

Heikkinen

Elomaa

et al. 2018

ACS Sustainable Chem. Eng.

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“…The aforementioned problem is rectified by limiting the duration of the peak current density to inhibit crystal growth. A ramp-down waveform is an excellent example of such a technique, in which the peak current density is instantly increased to promote nuclei formation, followed by a gradual decrease to impede crystal growth (by preventing the onset of a diffusion-controlled process) while new nuclei can still be formed (17). Figure 6 shows TEM images of platinum particles for electrodes fabricated using (a) ramp-down, b) triangular and (c) rectangular waveforms with a peak deposition current density of 400 mA cm -2 , a duty cycle of 4%, and 0.35 ± 0.02 mg Pt cm -2 .…”

Section: Resultsmentioning

confidence: 99%

Pulse Current Electrodeposition of Nanocatalysts Using Different Waveforms for Use in PEMFCs

Karimi

2013

ECS Trans.

Self Cite

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An electrochemical method based on pulse current electrodeposition (PCE) utilizing different waveforms was developed and used for fabricating membrane-electrode assemblies (MEAs) with low catalyst loading for use in proton exchange membrane (PEM) fuel cells. It was found that both peak deposition current density and duty cycle control the nucleation rate and the growth of platinum crystallites. Based on the combination of parameters used in this study, the optimum conditions for PCE were found to be a peak deposition current density of 400 mA cm -2 , a duty cycle of 4%, and a pulse generated and delivered in the microsecond range utilizing a ramp-down waveform. MEAs prepared by PCE using the ramp-down waveform show performance comparable with commercial MEAs that employ several times the loading of platinum catalyst.

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“…Wang et al [16] reported the optimized method of the operating parameters of the EO under pulse mode for treatment recalcitrant dye wastewater to improve the TOC degradation and the energy consumptions. A study on the different pulse waveforms in pulse electrodepositing for platinum catalyst has been investigated [17]. The types of Pt/C electrodes, PbO2 anode, and Ni-rich electrolytes in the pulse EO technology were considered [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

Nhut¹,

Vietnan²,

Nhut³

2024

RE&PQJ

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Due to the rapid economic development in recent years, water-chiller is being used more and more in hotels, restaurants, resorts, and industrial zones in Vietnam. The cooling tower’s cooling water quality is an important factor in determining the effect on electrical consumption and the coefficient of performance of a water-cooled chiller. Therefore, it is necessary to maintain the quality of cooling water during the operation time of the water-cooled chiller. The aim of this work is to investigate the effects of the pulse frequency and operational parameters such as current density, pulse duty cycle, and energy consumption on the performance of removing hardness ion of electrochemical cooling water treatment for the cooling tower of the water-cooled chiller. The results show that the highest efficiency of the total hardness removal corresponding to a pulse frequency of 1 kHz, a pulse duty cycle of 0.7, and a current density of 80A/m2.

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Pulse electrodeposition of platinum catalyst using different pulse current waveforms

Cited by 20 publications

References 13 publications

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Pulse Current Electrodeposition of Nanocatalysts Using Different Waveforms for Use in PEMFCs

Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

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