Electrodeposited composite electrode materials: effect of the concentration of the electrocatalytic dispersed phase on the electrode activity

Bertoncello, Renzo; Furlanetto, Ferdinando; Guerriero, P.; Musiani, Marco

doi:10.1016/s0013-4686(99)00165-6

Cited by 32 publications

(22 citation statements)

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“…Research on developing methods to produce catalytically active composite coated anodes which can operate as anodes to generate oxygen at a low overpotential and maintain good resistance to corrosion continues (Musiani and Guerriero, 1998;Bertoncello et al, 1999;Bertoncello et al, 2000;Hrussanova et al, 2001Hrussanova et al, , 2002Hrussanova et al, , 2004aHrussanova et al, and 2004bCattarin et al, 2001;Velichenko et al, 2002Velichenko et al, , 2008Velichenko et al, , 2009aVelichenko et al, and 2009b. Prengaman and Siegmund (2007) This paper presents the results of a study which aims to extend the previous work and utilise some of the benefits of cobalt by introducing it directly into the surface layer of the anode, thus avoiding the need to continuously add cobalt ions to the electrolyte.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…This might be related to passivation of the surface by lead sulphate formed in a chemical process coupling lead oxidation and cobalt catalysed hydrogen reduction, hence, the electrochemical formation of lead sulphate is no longer apparent (Musiani et al, 1999). After this, the coated anodes remain passive until oxygen evolution starts (peak B).…”

Section: Figure 3 Cyclic Voltammograms On Pb-co and Pb-co 3 O 4 Coatmentioning

confidence: 99%

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Electrodeposition of lead–cobalt composite coatings electrocatalytic for oxygen evolution and the properties of composite coated anodes for copper electrowinning

Barmi

Nikoloski

2012

Hydrometallurgy

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ÔØ Å ÒÙ× Ö ÔØElectrodeposition of lead-cobalt composite coatings electrocatalytic for oxygen evolution and the properties of composite coated anodes for copper electrowinning Please cite this article as: Barmi, Maryam Jozegholami, Nikoloski, Aleksandar N., Electrodeposition of lead-cobalt composite coatings electrocatalytic for oxygen evolution and the properties of composite coated anodes for copper electrowinning, Hydrometallurgy (2012), doi: 10.1016/j.hydromet.2012.08.005 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. , which is significantly less than the 122 mV dec -1 measured on the conventional PbCaSn anodes. The composite anodes exhibited consistently lower oxygen evolution potentials than the conventional type and the potential remained relatively stable throughout the polarisation period. The reduction in the operating anode potential can be attributed to the presence of cobalt in the surface layer while the decrease in the Tafel slope shows that this reduction can be related to a change in the mechanism of the oxygen evolution reaction. Corrosion rates estimated from 16 h tests showed that the composite coated anodes are more stable than the conventional type during short periods of operation. It was also observed that for the Pb-Co coated anode, both the rate of corrosion and the overpotential for the oxygen evolution reaction can be further reduced by the addition of organic additives such as thiourea. : electrowinning, overpotential, anode, lead, cobalt, thiourea A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT Keywords INTRODUCTIONLead based anodes have been used in the electrowinning of base metals for more than a century due to their low cost and availability. However, the conventional types of lead based anodes, such as PbCaSn, operate at relatively high oxygen overpotential, which results in significant energy consumption, and suffer from corrosion which takes place at a slow rate during the electrowinning process. It is reported that 20-25% of the overall cell energy consumption in tankhouses using conventional lead based anodes is attributed to oxygen evolution overpotential (Schmachtel et al., 2008). On the other hand, the slow corrosion is adding to the cost of anode replacement but, also, leads to contamination of the cathodes with lead from the corrosion product which lowers the quality of the produced cathodes.The development of anodes that can evolve oxygen from acidic sulphate solutions at lower overpotential than on the conventional lead based anode has a long history in the hydrometallurgical research field. This was revisited in the present study, with particul...

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Figure 3 Cyclic Voltammograms On Pb-co and Pb-co 3 O 4 Coatmentioning

confidence: 99%

Electrodeposition of lead–cobalt composite coatings electrocatalytic for oxygen evolution and the properties of composite coated anodes for copper electrowinning

Barmi

Nikoloski

2012

Hydrometallurgy

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“…Binh et al (2011) very recently tried to prepared PbO 2 /PANI composite anode. People also used composites materials like PbO 2 /RuO 2 Bertoncello et al, 1999), PbO 2 /Co 3 O 4 (Musiani, 1996;Bertoncello et al, 1999), PbO 2 /IrO 2 (Musiani, 2000) to get a more stable and active anode for oxygen evolution. More recently, the PbO 2 /TiO 2 composites have attracted considerable attention due to its potential application in photo electrocatalytic oxidation of organic waste in wastewater (Velichenko et al, 2009).…”

Section: The Preparation Of Lead Dioxidementioning

confidence: 99%

Anodic Materials with High Energy Efficiency for Electrochemical Oxidation of Toxic Organics in Waste Water

Wang¹,

Chen²,

Guo³

et al. 2012

Industrial Waste

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“…Thin nanostructured oxide layers produced by electrodeposition have been used as appropriate materials for different electrochemical processes, ranging from anticorrosive to electrocatalytic properties [4][5][6][7][8][9] . Among the electrocatalytic coatings, there is a great interest in those useful to enhance the O 2 and H 2 evolution reactions (respectively, oxygen evolution reaction -OER, and hydrogen evolution reaction -HER), which are important in several technological processes, such as water electrolysis, fuel cells, batteries and sensors 1,[10][11][12][13][14][15][16][17] . HER and OER are directly related to the demand for sustainable clean energy and concerns about climate change and global warming.…”

Section: Introductionmentioning

confidence: 99%

“…Although noble metals, such as Pt, Au, Ag, Ru and Ir, are generally used as electrodes for OER, they have high cost and low stability in alkaline medium [10][11][12] . Therefore, there is a growing demand to replace these metals by alternative catalysts with low cost and similar performance 15,16,18 . Transition metal oxides, such as Ni, Co, V, Fe, as well as Sn oxides, present electrocatalytic properties, which make them attractive alternatives electrodes for several reactions, including OER 16 .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Electrolyte pH on the Ni-Co Mixed Oxides Coatings Produced from Citrate Baths

et al. 2018

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In this work, Ni-Co oxides coatings were produced using electrochemical techniques (chronopotentiometry and/or linear voltammetry) and solutions containing Ni 2+ and Co 2+ ions in the molar ratio 1: 2, sodium citrate as the ligand, and different pH values (7.5 and 10.5). Energy dispersive spectrometry (EDS), scanning electron microscopy (SEM), Raman spectroscopy (LRS) and electrochemical impedance spectroscopy (EIS) were used to characterize these coatings. The results showed that both pH values favored the production of Ni-Co oxide phases, independent of the electrochemical technique used. The EDS analysis indicated that it was possible to produce of oxides coating presenting different Ni:Co ratios using electrodeposition process. However, the morphology, the microstructure and the electrocatalytic ability of the coatings depended on both the pH and on the electrochemical technique used to produce them. The coatings produced using pH 10.5 were suitable to be used as electrocatalysts for the oxygen evolution reaction (OER).

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Electrodeposited composite electrode materials: effect of the concentration of the electrocatalytic dispersed phase on the electrode activity

Cited by 32 publications

References 35 publications

Electrodeposition of lead–cobalt composite coatings electrocatalytic for oxygen evolution and the properties of composite coated anodes for copper electrowinning

Electrodeposition of lead–cobalt composite coatings electrocatalytic for oxygen evolution and the properties of composite coated anodes for copper electrowinning

Anodic Materials with High Energy Efficiency for Electrochemical Oxidation of Toxic Organics in Waste Water

The Effect of Electrolyte pH on the Ni-Co Mixed Oxides Coatings Produced from Citrate Baths

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