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TiO2纳米管阵列电极制备与光催化制氢性能的关系
作者:潘能乾 廖建军 李丹红 王桂振 李建保 林仕伟 
单位:海南大学材料与化工学院 热带岛屿资源先进材料教育部重点实验室 海口 570228 
关键词:二氧化钛纳米管阵列 光催化制氢 阳极氧化 正交试验 分层混晶结构 
分类号:
出版年,卷(期):页码:2013,41(10):1366-1374
DOI:
摘要:
通过正交试验分析不同阳极氧化电压、氧化时间、氧化次数以及热处理温度对TiO2纳米管阵列电极性能的影响机理,使用电化学工作站测试电极光电化学性能,结合扫描电子显微镜、X射线衍射、紫外–可见漫反射光谱等表征手段着重研究影响电极催化性能的内在机理。结果表明:不同阳极氧化和热处理使电极获得不同的微观结构和晶型,导致电极光催化性能差异明显。60 V恒压下1次阳极氧化1 h的样品经500 ℃热处理后,保持规整的纳米管阵列结构和较大的活性面积,并获得了特殊的分层混晶结构,具有较好的催化活性。同时,使用同一电极进行多次光催化制氢反应。紫外光照下,在0.5 mol/L Na2SO4 + 0.5 mol/L乙二醇水溶液中,0.5 V偏压下获得了5.3 mL/(h?cm2)的稳定产氢速率,证明电极具有稳定的光催化制氢活性。
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The relationship between the preparation conditions and photocatalytic hydrogen evolution properties on TiO2 nanotube array electrodes was discussed. The influences of anodization potentials, durations, counts and thermal treatment temperature on the electrode performance were investigated via an orthogonal test. The electrodes were characterized by scanning electron microscopy, X-ray diffraction and UV-Vis diffuse reflectance spectroscopy, respectively. The photoelectrochemical properties of electrodes were also examined by an electrochemical work station. The underlying mechanism was analyzed. The results show that TiO2 nanotube-array electrodes prepared at different parameters of anodic oxidation and thermal treatment lead to different microstructures and crystalline phase compositions, and consequently affect the photocatalytic performances. The highly-ordered TiO2 nanotube arrays are achieved after first-step anodization at 60 V for 1 h. The layered mixed crystal is obtained by heat treatment at 500 ℃. Furthermore, the multiple photocatalytic experiments were conducted using one electrode in 0.5 mol/L Na2SO4+0.5 mol/L ethylene glycol water solutions under UV light. The H2 evolution rate is 5.3 mL/(h?cm2) at a bias voltage of 0.5 V. The electrode exhibits superior photocatalytic stability.
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基金项目:
国家自然科学基金(51202050,51162007);教育部“新世纪优秀人才支持计划”(NCET–09–0110)。
作者简介:
参考文献:
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