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中文摘要：
应用电化学阳极氧化法在纯钛箔表面构筑TiO2纳米管阵列膜,借助离子交换法对纳米管阵列膜作钴离子（Co2＋）掺杂.扫描电子显微镜（SEM）、X-射线衍射（XRD）观察膜层的形貌和晶型,紫外-可见吸收光谱（UV-Vis）、光电化学分别测试Co2＋掺杂TiO2纳米管阵列在不同波长范围内的光电响应特性和光生阴极保护行为,考察Co2＋掺杂量对TiO2纳米管阵列几何尺寸、形貌和光电性能的影响.结果表明,掺杂适量Co2＋形成的杂化能级可有效窄化TiO2带隙宽度,并使光响应扩展至可见光区.Co2＋掺杂TiO2纳米管阵列膜在400～650 nm波长范围有较强的光吸收,对403不锈钢光生阴极保护作用明显.
英文摘要：
A highly ordered Co2 ＋ doped TiO2 nanotube layer was fabricated by potentiostatic anodization of pure titanium in fluorinated electrolyte solutions followed by ion-exchange method.The structure and composition of the as-prepared Co2 ＋ doped TiO2 nanotube layer were characterized by SEM,XRD,UV-Vis,and XPS.The effects of dopant content on the morphologies,structural and photochemical properties of the TiO2 nanotube arrays were investigated.The performances of photogenerated cathodic protection and the photoelectrochemical response for the Co-doped TiO2 nanotube arrays under illumination and dark conditions were evaluated through the electrochemical measurements.The Co-doped TiO2 nanotubes showed a stronger absorption in the visible light range,due to a low recombination of photogenerated hole-electron.The open-circuit potentials of 403 SS（stainless steel） coupled with the Co-doped TiO2 nanotube arrays shifted negatively under visible light irradiation.It was indicated that the Co-doped TiO2 nanotube arrays were able to provide an effective photogenerated cathodic protection for metals under regular sunlight conditions.
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