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OALib Journal期刊
ISSN: 2333-9721
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pb--0.3%ag/pb--co3o4复合惰性阳极材料的电化学性能
Keywords: 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:
？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--40g/l)下制备的复合惰性阳极材料电化学性能,在50g？l-1zn2+,150g？l-1h2so4,35℃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3a/dm2正向脉冲平均电流密度和30g/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500a/m2测试电流密度下的析氧过电位为0.891v,比pb--1%ag合金降低280mv；伏安电荷q*为0.725c？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。
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