Influence of Crystal Structure and Interparticle Contact on the Capacity of PbO2 Electrodes

Abstract

Chemically prepared specimens of a-and ~-PbO2 were discharged in lm H2SO4 under defined conditions of mechanical compression. Various quantities of graphite were added to the PbO2 specimens in order to study the influence of electric contact between particles. Electrodes of a-PbO~ (having a high degree of structural disorder) presented a higher discharge efficiency than those of well crystallized ~-PbO2. The capacity increased in the presence of graphite and with increasing Brunauer, Emmett, and Teller (BET) area. Graphite was found to suppress the diffusion potential in the PbSO, layer and to permit extended discharge at a second voltage plateau, due to the reaction 2e-+ PbO2(c) + 2H+(aq)--* PbO(c) + H20(aq).

Electrodeposition of PbO2 on glassy carbon electrodes: influence of ultrasound power

“…The preparation of lead dioxide anodes is an active research field because of the diversity of applications in batteries [1], wastewater treatment by electrooxidation of organics [2,3], ozone generation [4], electrosynthesis [5] and electrowinning of metals [6] of this type of anodes.…”

Kinetics of Electrocrystallization of PbO[sub 2] on Glassy Carbon Electrodes Partial Inhibition of the Progressive Three-Dimensional Nucleation and Growth

“…Studies on the lead dioxide electrodeposition process have been and still are of the continuous interest because of the wide diversity of applications of this material as electrode in batteries [1,2], waste water treatment by electrooxidation of organics [3,4], ozone generation [5], electrosynthesis [6][7][8][9], and electrowinning of metals [10]. These studies deal with numerous subjects such as performance characteristics as an anode material [11], physicochemical properties [12], electrocatalytic behaviour [13,14] and structural changes [15].…”

Nature of the Band Gap and Origin of the Conductivity ofPbO2Revealed by Theory and Experiment

“…This conductivity has been lead dioxide has been of great practical importance due to attributed to oxygen vacancies (V O ) [16], lead interstitials its utility in many electrochemical processes. [2] These (Pb i ) [17], and adventitious incorporation of hydrogen into applications depend strongly on the electrical conductivity the system [12,15,18]. and redox chemistry of the material [2,3].…”