| TiO2纳米管双室光电化学池光催化制氢的研究 |
| Photocatalytic Hydrogen Generation of TiO2 Nanotubes in a Two-Compartment Photoelectrochemical Cell |
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| 摘要: 以阳极氧化法在纯钛表面制备了高度有序的TiO2纳米管阵列, 并通过SEM观察其表面形貌.采用双室光电化学池制氢体系, 利用太阳光照TiO2产生的光电压与双室电解液pH差产生的化学偏压的协同效应, 不施加外加电压, 可直接在阴极室还原制取氢气.通过在碱性电解液中添加乙二醇为电子给体, 将光解水制氢与有机物的降解耦合为一体, 提高太阳能的利用率, 同时考察了阳极室电解液中添加不同含量乙二醇对TiO2纳米管光阳级的光电化学性能及产氢量的影响.实验结果表明, 乙二醇的添加降低了光生电子-空穴对的复合几率, 使TiO2纳米管的光电流、光电压、产氢量得到显着提高.当添加乙二醇的浓度为10vol%时光电流达到13.7 mA·cm-2,无外加电压条件下, 双室光电化学池中的产氢速率最高达到3.8 μmol·min-1·cm-2. |
| 关键词: TiO2纳米管 光电化学性能 光催化 制氢 |
| 基金项目: 成都大学校青年基金(No.20805084)资助项目. |
| Abstract: Highly ordered TiO2 nanotube arrays were synthesized by electrochemical anodic oxidation of titanium foil, and the morphology of sample was characterized by FESEM. Hydrogen generation without applying any external voltage was carried out in the two-compartment photoelectrochemical (PEC) cell. The pH difference between acidic electrolyte and alkaline electrolyte could generate a chemical bias. Due to the synergetic effect of chemical bias and the photovoltage of TiO2 produced under solar light illumination, efficient hydrogen production was achieved. Hydrogen generation coupled~with the degradation of organic pollutants was obtained by adding ethylene glycol into alkaline electrolyte, which enhanced the utilization of solar energy. The effect of ethylene glycol additive concentration on the photoelectrochemical properties and hydrogen production was investigated. The results indicated that the photocurrent,photovoltage and hydrogen production of TiO2 nanotube photoanode were significantly improved due to the addition of ethylene glycol, which efficiently reduced the recombination of photogenerated electrons and holes. Addition of 10vol% ethylene glycol produced a photocurrent density of 13.7 mA·cm-2. Without any external applied voltage, the maximum hydrogen production rate of 3.8 μmol·min-1·cm-2 was obtained. |
| Keywords: TiO2 nanotubes photoelectrochemical properties photocatalysis hydrogen generation |
| 投稿时间：2014-04-20 修订日期：2014-08-21 |
| 摘要点击次数: 1542 |
| 全文下载次数: 2806 |
| 孙艳,闫康平.TiO2纳米管双室光电化学池光催化制氢的研究[J].无机化学学报,2014,30(12):2740-2746. |
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