Bi-doped PbO2 anodes: Electrodeposition and physico-chemical properties

被引：102
作者：
Shmychkova, O. [1 ]
Luk'yanenko, T. [1 ]
Velichenko, A. [1 ]
Meda, L. [2 ]
Amadelli, R. [3 ]
机构：
[1] Ukrainian State Univ Chem Technol, UA-49005 Dnepropetrovsk, Ukraine
[2] Ist Guido Donegani Energie Non Convenz, Novara, Italy
[3] Univ Ferrara, Dipartimento Chim, Ist Sintesi Organ & Fotoreatt Consiglio Nazl Rece, I-44121 Ferrara, Italy
来源：
ELECTROCHIMICA ACTA | 2013年 / 111卷
关键词：
Lead dioxide; Methanesulfonic electrolyte; Electrodeposition kinetics; Bismuth ions; Oxygen evolution; OXYGEN-TRANSFER REACTIONS; LEAD DIOXIDE ELECTRODEPOSITION; ELECTROCHEMICAL OXIDATION; DIRECT ELECTROLYSIS; AQUEOUS-SOLUTION; FLOW BATTERY; ELECTROCATALYSIS; ELECTROSYNTHESIS; MECHANISM; OXIDE;
D O I：
10.1016/j.electacta.2013.08.082
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The influence of bismuth ions on kinetics of lead dioxide electrodeposition from methanesulfonate electrolytes and physico-chemical properties of obtained coatings were studied. Experimental results are consistent with a mechanism previously proposed in the literature for lead dioxide electrodeposition. The presence of bismuth ions in the electrodeposition solution causes a decrease of rate constants of lead dioxide formation due to co-adsorption phenomena. Deposits from solutions containing bismuth ions appear shiny dark grey, and show good adhesion to metal support. SEM images reveal a compact structure with spindle-shaped submicron and nanosized crystals and X-ray diffractograms demonstrated that incorporation of bismuth diminishes the size of crystal particles. Oxygen evolution was investigated to test electrocatalytic activity. It is shown, that oxygen overpotential on modified electrodes is significantly higher than on non-modified PbO2-electrode, which depends on bismuth content in deposit and segregation of bismuth that induces surface heterogeneity due to sites with different electroactivity for water oxidation. (C) 2013 Elsevier Ltd. All rights reserved.
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页码：332 / 338
页数：7
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