Structural changes of the texture of β-lead dioxide—titanium anodes during the oxygen/ozone electrosynthesis in neutral and acid electrolytes

Thanos, J. C. G.; Wabner, Dietrich

doi:10.1016/0368-1874(85)85438-1

Cited by 18 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that in all cases except solution A, the total nitrate concentration was maintained at 0.1 M. These solutions were used in the experiments described below. In neutral or acidic solution, the overall reaction for the generation of PbO 2 is (although the elementary steps of this reaction are the subject of considerable debate). ,,− It should be noted that the solutions used were unbuffered; the addition of buffer is known to affect the morphology of many electrodeposits, including PbO 2 . It is therefore possible that during the experiments the surface pH differed from the bulk pH to some extent.…”

Section: Resultsmentioning

confidence: 99%

An AFM Study of the Correlation of Lead Dioxide Electrocatalytic Activity with Observed Morphology

2004

View full text Add to dashboard Cite

PbO2 is widely employed as an electrocatalyst for anodic oxidation processes including the generation of oxygen and the degradation of various organic species in aqueous solution. However, despite extensive investigation, the precise mechanism of action remains obscure. In this paper we establish a previously unrecognized strong correlation between the morphology of the PbO2 deposits and their electrocatalytic activity. Cyclic voltammetric results are described for the electrodeposition of PbO2 on boron-doped diamond (BDD) electrodes from 2.5 mM solutions of lead(II) nitrate in nitric acid at pH values between approximately 0 and 7. A likely change in mechanism is observed around pH 4, consistent with the Pourbaix diagram of lead. The morphology of the PbO2 films is observed as a function of time and potential, using in situ AFM in each of the lead solutions. Information on the growth rates of the films is extracted, and the limitations of using AFM in such an application are discussed. It is shown that the deposit morphology depends strongly on the specific conditions used. The oxidation of a 100 mM glucose solution on electrodes modified by PbO2 deposition at a range of potentials and pH values is used as an indicator of the catalytic activity of the corresponding films, leading to the observation of the correlation between deposit morphology and catalytic activity mentioned above.

show abstract

Section: Resultsmentioning

confidence: 99%

An AFM Study of the Correlation of Lead Dioxide Electrocatalytic Activity with Observed Morphology

2004

View full text Add to dashboard Cite

show abstract

“…Indeed, the decrease in temperature alters the electrolyte resistance and seems to result in less growth of a PbO 2 coating with mainly the α phase. 45,46 In order to understand the impact of temperature on the interfacial process was used AC impedance spectroscopy. Figure 3a shows the Nyquist plots of T25, T55, and T85 deposits in 0.5 M H 2 SO 4 electrolyte.…”

Section: Resultsmentioning

confidence: 99%

Impact of Deposition Condition on the Morphology and Electrochemical Performance of Deposited F-Doped PbO₂on Graphite Substrate in Primary PbO₂-Zn Battery

Abedini¹,

karkeabadi²

2022

J. Electrochem. Soc.

View full text Add to dashboard Cite

The impact of deposition process parameters (temperature, current density, Pb2+ concentration, and time of deposition) on morphology, electrical resistance, and discharge performance of a graphite/ PbO2 cathode in a PbO2/ zinc primary battery was investigated. The morphology, architecture, and phase composition of the PbO2 deposits were studied by FESEM, EDX, and XRD. The AC impedance and discharge tests were utilized for the exploration of the interfacial process and discharge performance of PbO2 deposits. The results indicate that the increment in temperature and decrease in current density leads to increased growth of PbO2 deposits with mainly β phase, formation of porous architecture, and a decrease in the charge transfer resistance (Rct). Also, with an increase in the deposition time to 30 min the Rct is increased due to the formation of PbO2 deposit with more uniform and compact structure. The deposition from 0.1 mol L‒1 Pb2+ solutions results in the formation of flower-like grains, a more porous surface, and lower Rct. However, because of concentration polarization, the PbO2 deposit prepared from 0.5 mol L‒1 of Pb2+ solutions, 55°C temperature, 40 mA cm‒2 current density, and 15 min deposition time shows the best discharge performance.

show abstract

“…Another possible mechanism leading to the decelerated OER rate is the altered surface adsorption when NaOAc additive is added to the electrolyte. According to a series of work published by Pavlov and co-workers, − the OER is likely induced by PbO*(OH) 2 , which would form at the active sites on PbO 2 surfaces in acidic media following the steps below: The intermediate species PbO*(OH) 2 is hypothesized to partially form as the overpotential increases at the PbO 2 surface through the following mechanism: ,, Reaction indicates that the full dehydration of PbO*(OH) 2 will lead to the formation of PbO 2 with smaller crystallites. Reactions and could largely increase the possibility of the OER due to the increased formation of PbO*(OH) 2 active sites for further hydroxyl bonding.…”

Section: Resultsmentioning

confidence: 99%

Impact of Acetate Additive on PbO₂ Plating and Oxygen Evolution in Soluble Lead Flow Batteries

Chen

C.-Y

Y.-H

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Soluble lead flow batteries (SLFBs), a potential form of large-scale energy storage, are currently facing the challenge of short cycle life. We previously demonstrated that by adding sodium acetate (NaOAc) in the electrolyte, the life span of SLFBs can be significantly extended. Here, we aim to elucidate the effect of acetate additive on SLFBs. We find that the mechanical strength of the PbO 2 layer plated by acetate-assisted electrolyte is materially enhanced. Through electron backscattering diffraction, certain preferred orientations of deposited PbO 2 are observed when plated without acetate additive, while random orientations are better preserved when plated with acetate additive. Via Brunauer−Emmett−Teller measurements, we find that porosity and surface area are both comparatively smaller in the acetate-assisted PbO 2 deposits, while the rate of oxygen evolution reaction (OER) is shown to be drastically reduced on PbO 2 plated with NaOAc-assisted electrolyte. We further propose that the OER pathway is suppressed by the additive due to acetate-ion adsorption at superficial PbO 2 sites, and in turn facilitates PbO 2 plating. These further discoveries are of critical value for further extending cycle life and enabling SLFB technology.

show abstract

Structural changes of the texture of β-lead dioxide—titanium anodes during the oxygen/ozone electrosynthesis in neutral and acid electrolytes

Cited by 18 publications

References 6 publications

An AFM Study of the Correlation of Lead Dioxide Electrocatalytic Activity with Observed Morphology

An AFM Study of the Correlation of Lead Dioxide Electrocatalytic Activity with Observed Morphology

Impact of Deposition Condition on the Morphology and Electrochemical Performance of Deposited F-Doped PbO₂on Graphite Substrate in Primary PbO₂-Zn Battery

Impact of Acetate Additive on PbO₂ Plating and Oxygen Evolution in Soluble Lead Flow Batteries

Contact Info

Product

Resources

About

Structural changes of the texture of β-lead dioxide—titanium anodes during the oxygen/ozone electrosynthesis in neutral and acid electrolytes

Cited by 18 publications

References 6 publications

An AFM Study of the Correlation of Lead Dioxide Electrocatalytic Activity with Observed Morphology

An AFM Study of the Correlation of Lead Dioxide Electrocatalytic Activity with Observed Morphology

Impact of Deposition Condition on the Morphology and Electrochemical Performance of Deposited F-Doped PbO2on Graphite Substrate in Primary PbO2-Zn Battery

Impact of Acetate Additive on PbO2 Plating and Oxygen Evolution in Soluble Lead Flow Batteries

Contact Info

Product

Resources

About

Impact of Deposition Condition on the Morphology and Electrochemical Performance of Deposited F-Doped PbO₂on Graphite Substrate in Primary PbO₂-Zn Battery

Impact of Acetate Additive on PbO₂ Plating and Oxygen Evolution in Soluble Lead Flow Batteries