Pb--0.3%Ag/Pb--Co3O4复合惰性阳极材料的电化学性能

材料研究学报

2012, Vol. 26

Issue (5): 495-502

研究论文

本期目录 | 过刊浏览

Pb--0.3%Ag/Pb--Co3O4复合惰性阳极材料的电化学性能

孔营^1,2, 徐瑞东^1,2, 黄利平², 关永永^1,2, 徐瑞东^1,2

1.昆明理工大学冶金与能源工程学院昆明 650093
2.云南省复杂有色金属资源清洁利用国家重点实验室培育基地昆明 650093
3.中国科学院特种无机涂层重点实验室上海 200050

Electrochemical Properties of Pb–0.3%Ag/Pb–Co₃O₄ Composite Inert Anodes

KONG Ying^1,2, XU Ruidong^1,2, HUANG Liping², GUAN Yongyong^1,2, CHEN Buming^1,2

1.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093
2.State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming 650093
3.Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 200050

引用本文:

孔营徐瑞东黄利平关永永徐瑞东. Pb--0.3%Ag/Pb--Co3O4复合惰性阳极材料的电化学性能[J]. 材料研究学报, 2012, 26(5): 495-502.
KONG Ying XU Ruidong HUANG Liping GUAN Yongyong CHEN Buming. Electrochemical Properties of Pb–0.3%Ag/Pb–Co₃O₄ Composite Inert Anodes[J]. Chinese Journal of Materials Research, 2012, 26(5): 495-502.

全文: PDF(1104 KB)

摘要:

在Pb--0.3%Ag合金基体表面制备了Pb--0.3%Ag/Pb--Co₃O₄复合惰性阳极材料, 研究了不同正向脉冲平均电流密度(2--5A•dm^-2)和镀液中Co₃O₄颗粒浓度(10--40 g/L)下制备的复合惰性阳极材料电化学性能, 在50 g•L^-1Zn²⁺, 150 g•L^-1 H₂SO₄, 35℃溶液中测试了阳极极化曲线、循环伏安曲线和塔菲尔曲线, 获得了析氧动力学参数、伏安电荷、腐蚀电位和腐蚀电流。结果表明: 在3 A/dm²正向脉冲平均电流密度和30 g/LCo₃O₄颗粒浓度下制备的Pb--0.3%Ag/Pb--Co₃O₄复合惰性阳极材料具有较高的电催化活性, 较低的析氧过电位, 较好的电极反应可逆性和耐腐蚀性。在500 A/m²测试电流密度下的析氧过电位为0.891 V, 比Pb--1%Ag合金降低280 mV；伏安电荷q^*为0.725 C•cm^-2, 比Pb--1%Ag合金提高26.5%；腐蚀电流也明显低于Pb--1%Ag合金。复合惰性阳极材料活性表面积大, 活性物质数量多提高了在[ZnSO₄+H₂SO₄]溶液中的析氧电催化活性。沉积层晶粒细小而均匀, 组织结构致密, 真实表面缺陷少提高了耐腐蚀性。

关键词 ：复合材料, 双脉冲电沉积, 复合惰性阳极材料, Co3O4颗粒, 电化学性能

Abstract：

Pb–0.3%Ag/Pb–Co3O4 composite inert anodes were prepared on the surface of Pb–0.3%Ag substrates, the electrochemical properties of the composite inert anodes obtained under different forward pulse average current densities from 2 A/dm2 to 5 A/dm2 and different Co3O4 concentrations from 10 g/L to 40 g/L in bath were investigated. The anodic polarization curves, cyclic voltammetry curves and Tafel polarization curves were measured in a synthetic zinc electrowinning electrolyte of 50 g/L Zn2+ and 150 g/L H2SO4 at 35 , the kinetic parameters of oxygen evolution, voltammetry charge, corrosion potential and corrosion current were obtained. The results show that Pb–0.3%Ag/Pb–Co3O4 composite inert anode obtained under forward pulse average current density of 3 A/dm2 and Co3O4 concentration
of 30 g/L in bath, possess higher electrocatalytic activity, lower overpotential of oxygen evolution, better reversibility of electrode reaction and corrosion resistance in a synthetic zinc electrowinning electrolyte. The overpotential of oxygen evolution of the composite inert anode is 0.891 V under 500 A/m2, and it is 280 mV lower than that of Pb–1%Ag alloy; the surface voltammetry charge q∗ is 0.725 C·cm−2, and is 26.5% higher than that of Pb–1%Ag alloy; the corrosion current is also lower than that of Pb–1%Ag alloy. Large active surface areas and active substance numbers on the surface of the composite inert anode improve the electrocatalytic activity for oxygen evolution in [ZnSO4+H2SO4] solution. Fine and uniform grains, compact microstructures and fewer surface defects increase the corrosion resistance of the composite inert anode.

Key words： composite materials double–pluse electrodeposition composite inert anod Co3O4 electrochemical properties

收稿日期: 2012-07-09

ZTFLH:

TB321

基金资助:

国家自然科学基金51004056和中国科学院特种无机涂层重点实验室开放基金KKZ6201152009资助项目。

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