Electrochemical Behaviors of Pb–0.3%Ag-0.06%Ca Rolled Alloy Anode during and after Zinc Electrowinning - Tafel Investigations

2013 ◽  
Vol 401-403 ◽  
pp. 779-782
Author(s):  
Hai Tao Yang ◽  
Huan Rong Liu ◽  
Zhong Cheng Guo ◽  
Bu Ming Chen ◽  
Yong Chun Zhang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Anodic Oxide ◽  
Zinc Electrowinning ◽  
Electrolysis Time ◽  
Surface Exchange ◽  
Electrochemical Behaviors ◽  
Alloy Anode ◽  
Galvanostatic Polarization ◽  
Sulphate Electrolyte ◽  
Kinetics Of

In this paper, the oxygen evolution potential and kinetics of Pb–0.3%Ag-0.06%Ca rolled alloy anode during the 15 days electrolysis in acid zinc sulphate electrolyte solution were investigated with galvanostatic polarization curve and Quasi-stationary polarization (Tafel) techniques. The results revealed that the anodic oxygen evolution potential and reaction kinetics varied a lot during the electrolysis for it is a process indicating the formation and stabilization of anodic oxide layer. With the increasing electrolysis time, the potentials (MSE) and overpotentials of oxygen evolution mainly present a declining trend while the electrode surface exchange current density a rising trend.

Electrochemical Behaviors of Pb-0.8%Ag Rolled Alloy Anode during and after Zinc Electrowinning - CV Investigations

2013 ◽  
Vol 746 ◽  
pp. 256-261 ◽  
Author(s):  
Hai Tao Yang ◽  
Huan Rong Liu ◽  
Yong Chun Zhang ◽  
Bu Ming Chen ◽  
Zhong Cheng Guo ◽  
...  
Keyword(s):  
Electrochemical Behaviour ◽  
Anodic Oxide ◽  
Anodic Peak ◽  
Zinc Electrowinning ◽  
Electrolysis Time ◽  
Positive Direction ◽  
Oxide Layers ◽  
Electrochemical Behaviors ◽  
Negative Direction ◽  
Sulphate Electrolyte

In this paper, electrochemical behaviour of Pb0.8%Ag anode during the 15 days galvanostatic electrolysis in acid zinc sulphate electrolyte solution was investigated with Cyclic Voltammetry (CV) techniques. The phase composition of the anodic oxide layers during the electrolysis was observed using X-Ray Diffraction (XRD). The results revealed that the electrochemical oxidation processes and phase formation varied obviously during the electrolysis for it is a process indicating the formation and stabilization of anodic oxide layer. With the increasing electrolysis time, the anodic peak (PbPbSO4) is mainly present a rise trend and gradually moved in the positive direction while the anodic peak (PbSO4β-PbO2, PbOα-PbO2) strongly moved in the negative direction. The cathodic peak (β-PbO2 and α-PbO2PbSO4) and (PbO and PbSO4Pb) mainly present a rise trend and gradually moved in the negative direction. Besides, the corrosion phase of the anodic oxide layers mainly consist of PbSO4, PbO, α-PbO2 and β-PbO2. With the increasing electrolysis time, the content of α-PbO2 presents a declining trend while the content of β-PbO2 a rising trend. The preferred growth orientation of α-PbO2 and β-PbO2 is (111) and (101) planes respectively.

Cyclic Voltammetric Studies of the Behavior of Pb-0.3%Ag-0.06%Ca Rolled Alloy Anode during and after Zinc Electrowinning

2013 ◽  
Vol 750-752 ◽  
pp. 2232-2235 ◽  
Author(s):  
Hai Tao Yang ◽  
Huan Rong Liu ◽  
Yong Chun Zhang ◽  
Bu Ming Chen ◽  
Zhong Cheng Guo ◽  
...  
Keyword(s):  
Electrochemical Behaviour ◽  
Anodic Oxide ◽  
Anodic Peak ◽  
Zinc Electrowinning ◽  
Positive Direction ◽  
Major Phase ◽  
Oxide Layers ◽  
Negative Direction ◽  
Alloy Anode ◽  
Sulphate Electrolyte

In this paper, electrochemical behaviour of Pb0.3%Ag0.06%Ca rolled alloy anode during the 6 days galvanostatic electrolysis in acid zinc sulphate electrolyte solution was investigated with Cyclic Voltammetry (CV) techniques. The phase composition of the anodic oxide layers during the electrolysis was observed using X-Ray Diffraction (XRD). The results revealed that with the increasing electrolysis time, the anodic peak (PbPbSO4) is mainly present a rise trend in the first day electrolysis, thereafter, almostly keep a constant value. And the anodic peak (PbPbSO4) gradually moved in the positive direction while the anodic peak (PbSO4β-PbO2, PbOα-PbO2) strongly moved in the negative direction. The cathodic peak (β-PbO2 and α-PbO2PbSO4) and (PbO and PbSO4Pb) mainly present a rise trend and gradually moved in the negative direction. Besides, the corrosion phase of the anodic oxide layers mainly consist of PbSO4, Pb, α-PbO2 and PbS2O3. After electrolysis for 3 days, the major phase of the anodic oxide layers is PbSO4 with a few Pb phase. When the electrolysis reaches the 6th day, the major phase of the anodic oxide layers is also PbSO4 with a few α-PbO2 phase. The preferred growth orientation of PbSO4 is (021) ,(121) and (212) planes.

Carbon nanotubes sheathed in lead for the oxygen evolution in zinc electrowinning

2018 ◽  
Vol 49 (1) ◽  
pp. 67-77 ◽  
Author(s):  
Chang-jiang Yang ◽  
Qing-feng Shen ◽  
Da-cheng Zhai ◽  
Yu Gu
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Evolution ◽  
Zinc Electrowinning

scholarly journals Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La1.85Sr0.15CuO4 Thin Films

2021 ◽  
Vol 11 (9) ◽  
pp. 3778
Author(s):  
Gene Yang ◽  
So-Yeun Kim ◽  
Changhee Sohn ◽  
Jong K. Keum ◽  
Dongkyu Lee
Keyword(s):  
Thin Films ◽  
Oxygen Vacancies ◽  
Elevated Temperatures ◽  
Surface Exchange ◽  
Electrical Conductivity Relaxation ◽  
Exchange Kinetics ◽  
Relaxation Curves ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Considerable attention has been directed to understanding the influence of heterointerfaces between Ruddlesden–Popper (RP) phases and ABO3 perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO3 (LNO) on La1.85Sr0.15CuO4 (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (kchem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the kchem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.

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