Preparation of anodes for oxygen evolution by electrodeposition of composite Pb and Co oxides

Cattarin, Sandro; Guerriero, P.; Musiani, Marco

doi:10.1016/s0013-4686(01)00713-7

Cited by 44 publications

(32 citation statements)

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“…Also, the surface of the Pb-Co 3 O 4 coated anode is slightly more compact and fine-grained than the Pb-Co(3%). In this context there seems to be consistency with earlier reports by other researchers (Musiani and Guerriero, 1998, Cattarin et al, 2001, Hrussanova et al, 2001) which observed that incorporation of cobalt species into the surface layer of lead based anodes increases the roughness of the anode. Naked eye observation showed that the Pb-Co 3 O 4 composite coating displays a spongy structure whereas the Pb-Co surface appears dendritic.…”

Section: Resultssupporting

confidence: 92%

“…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%

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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: Resultssupporting

confidence: 92%

Section: Accepted M Manuscriptmentioning

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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“…Also, the electrocatalytic activity of Ti/Co-PbO 2 decreases, as compared with a pure b-PbO 2 electrode. The incorporation of Co oxide into the PbO 2 electrode may reduce the oxygen evolution overvoltage, which induces oxygen evolution on Ti/Co-PbO 2 much easier than on Ti/ b-PbO 2 [42,43]. Therefore, the oxidation of organic compounds was diminished on Ti/Co-PbO 2 , which led to a lower TOC removal.…”

Section: Toc Removal Of Onp On Pbo 2 Electrodesmentioning

confidence: 99%

Electrocatalytic oxidation of nitrophenols in aqueous solution using modified PbO2 electrodes

Liu

Zhang

et al. 2007

J Appl Electrochem

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Various kinds of modified lead dioxide (PbO 2 ) electrodes, doped with bismuth oxides and cobalt oxides, were prepared by electrodeposition in acid solution, and were characterized in terms of their morphological (SEM) and structural (XRD) features. Mineralization experiments on o-nitrophenol (ONP) in an electrocatalytic oxidation system showed that the electrocatalytic activity of Ti/BiPbO 2 was superior to the traditional dimensionally stable anodes (DSAs) Ti/b-PbO 2 and other modified PbO 2 electrodes. The mineralization, reaction kinetics and nitrogroup transformation of nitrophenols (ONP, p-nitrophenol (PNP) and m-nitrophenol (MNP)) on Ti/Bi-PbO 2 electrodes were studied and compared. NPs were degraded completely under the present experimental conditions by applying a 30 mA cm -2 current density at pH 4.3 in 0.1 M Na 2 SO 4 and 0.01 M NaCl. The degradation of NPs lay in the order: ONP [ MNP [ PNP. A simple degradation mechanism model is proposed.

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“…Tafel slopes of 60-70 mV dec -1 , whereas a PbO 2 -Co 3 O 4 coated anode has been reported with a Tafel slope of 59 mV dec -1 (Cattarin et al, 2001 andCattarin et al, 2000). Overall, variation of the Tafel slope is a sign that the mechanism of the electrochemical reaction has changed which indicates that the electrocatalytic effect is real.…”

Section: Accepted M Manuscriptmentioning

confidence: 95%

“…On the other hand, IrO 2 is more expensive than RuO 2 and its electrocatalytic activity is slightly lower (Chen et al, 2001). As anodes with a lead dioxide coating possess high electrical conductivity, good electrochemical and chemical stability against corrosion and are relatively inexpensive, researchers have long considered using lead dioxide as a surface layer on a Ti substrate, with the lead dioxide sometimes doped with other metal oxides such as ZrO 2 , TiO 2 , Ta 2 O 5 , CoO x , Co 3 O 4 , RuO 2 and others (Velichenko et al, 2009a(Velichenko et al, , 2009b(Velichenko et al, and 2009cYeo et al, 2010;Morimitsu et al, 2010;Cattarin et al, 2001;Musiani et al, 1997;Bertoncello et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Novel lead–cobalt composite anodes for copper electrowinning

Nikoloski

Barmi

2013

Hydrometallurgy

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PbO 2 -CoO x and PbO 2 -Co 3 O 4 composite coated anodes, using titanium and nickel substrates, have been successfully prepared and tested under typical copper electrowinning conditions. The aim of depositing a well-adhered composite coating onto the surface of the titanium and nickel substrate materials was pursued using three different coatings. The performance of the produced anodes was examined in terms of oxygen evolution potential and service life. Both of the anodes with PbO 2 -CoO x or PbO 2 -Co 3 O 4 deposited on titanium resulted in reduction of the oxygen evolution potential of 300 to 400 mV compared with a conventional PbCaSn anode. The anodes prepared by applying the same coatings onto a nickel substrate showed poor stability in the acidic electrolyte media used in this experiment to represent typical copper electrowinning conditions. Of the different coatings tested, a combination of thermal deposition of a SnO 2 -Sb 2 O 3 interlayer on the surface of a titanium substrate followed by electrodeposition of the top layer of the composite coating resulted in the best electrochemical activity and service life for the anodes. A Tafel slope of 88 mV dec -1 was recorded for the anode with a top coating of PbO 2 -CoO x and 47 mV dec -1 for the anode with a top coating of PbO 2 -Co 3 O 4 , which both compare favourably to the 122 mV dec -1 which was observed for a conventional PbCaSn anode. Anodisation tests were carried out for a period of 16 hours both in the presence and in the absence of the organic additive thiourea in the electrolyte. Corrosion rates were estimated from these tests and the results showed that the titanium based anode with a SnO 2 -Sb 2 O 3 interlayer and PbO 2 -CoO x coating has a lower corrosion rate than a conventional PbCaSn anode, whereas the corrosion rate of the titanium based anode with same interlayer and PbO 2 -Co 3 O 4 coating might be much greater but this remains to be confirmed. The results also showed that the addition of thiourea appears to increase the corrosion rate of the composite coated anodes although it reduces the corrosion rate of a PbCaSn anode. Thiourea showed no obvious effect on the anode potential.

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Preparation of anodes for oxygen evolution by electrodeposition of composite Pb and Co oxides

Cited by 44 publications

References 13 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

Electrocatalytic oxidation of nitrophenols in aqueous solution using modified PbO2 electrodes

Novel lead–cobalt composite anodes for copper electrowinning

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