Citation: ZHONG Xiao-Cong, GUI Jun-Feng, YU Xiao-Ying, LIU Fang-Yang, JIANG Liang-Xing, LAI Yan-Qing, LI Jie, LIU Ye-Xiang. Influence of Alloying Element Nd on the Electrochemical Behavior of Pb-Ag Anode in H₂SO₄ Solution[J]. Acta Physico-Chimica Sinica, ;2014, 30(3): 492-499. doi: 10.3866/PKU.WHXB201312301 shu

Influence of Alloying Element Nd on the Electrochemical Behavior of Pb-Ag Anode in H₂SO₄ Solution

1.
1 School of Metallurgy and Environment, Central South University, Changsha 410083, P. R. China;
2 Powder Metallurgy Research Institute, Central South University, Changsha 410083, P. R. China

Received Date: 1 November 2013
Available Online: 30 December 2013
Fund Project: 国家自然科学基金(51204208，51374240)，国家科技支撑计划课题(2012BAA03B04) (51204208，51374240)，国家科技支撑计划课题(2012BAA03B04)湖南省自然科学基金(13JJ1003)资助项目 (13JJ1003)

Anodic layers and oxygen evolution reaction (OER) of Pb-Ag and Pb-Ag-Nd anodes were investigated by cyclic voltammetry, linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and environmental scanning electron microscopy (ESEM). Alloying with Nd promoted the formation of Pb/PbO_n/PbSO₄ (1≤n<2). Nd facilitated the transformation of PbO_n and PbSO₄ to α-PbO₂ and β-PbO₂, at potential above 1.2 V vs Hg/Hg₂SO₄ (saturated K₂SO₄ solution). ESEM and LSV indicated that the anodic layer formed on the Pb-Ag-Nd anode was thicker and more compact than that formed on the Pb-Ag anode. Consequently, the anodic layer on the Pb-Ag-Nd anode could provide better protection for metallic substrates. EIS indicated that the OER was determined by the formation and adsorption of intermediates. Nd enhanced the OER reactivity, because of a smaller adsorption resistance and larger coverage of intermediates at the anodic layer/electrolyte interface. In summary, alloying with Nd can enhance the corrosion resistance and reduce the energy consumption of Pb-Ag anode due to lower anodic potential.
- Electrowinning,
- Anodic layer,
- Passivation,
- Oxygen evolution,
- Corrosion resistance
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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of Alloying Element Nd on the Electrochemical Behavior of Pb-Ag Anode in H2SO4 Solution

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Influence of Alloying Element Nd on the Electrochemical Behavior of Pb-Ag Anode in H₂SO₄ Solution