Iron oxides with highly ordered mesoporosity for photoelectrochemical oxygen formation from water

具有高度有序介孔性的铁氧化物用于从水中光电化学形成氧气

• 批准号: 220973586
• 负责人: Professor Dr. Detlef Bahnemann
• 金额: --
• 依托单位: Institut für Technische Chemie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/220973586?language=en
• 关键词: Iron; oxides; highly; ordered; mesoporosity

Hematite (α-Fe2O3) is discussed to be a promising material for the fabrication of photoanodes for the oxygen evolution from water in photoelectrochemical (PEC) cells. To overcome inherent limitations of this material nanostructuring has been proposed. Thus, the optimization of the morphology of hematite photoanodes is the ultimate goal of this project. Hematite with controlled ordered mesoporosity, large surface areas and highly crystalline walls will be synthesized by a novel sol-gel approach (“brick and mortar”), electrochemical deposition and deposition in a 3D-mesoporous conductive indium-tin oxide (ITO) network. All the obtained nanostructures will be photoelectrochemically characterized in detail and charge carrier dynamics will be studied employing laser flash photolysis and stopped-flow techniques. Since it is known that under irradiation with light of wavelengths smaller than the band gap energy of hematite photodissolution of iron(II) can occur and this might possibly alter the morphology of the photoanode and their photoelectrochemical characteristics, the dissolutionprecipitation mechanism will be analyzed and methods to improve the long-term stability of the anodes will be elaborated.

赤铁矿（α-Fe2O3）是一种很有前途的制备光电化学（PEC）电池中水析氧光阳极的材料。为了克服这种材料的固有局限性，人们提出了纳米结构。因此，优化赤铁矿光阳极的形貌是本课题的最终目标。赤铁矿具有可控有序介孔、大表面积和高结晶壁，将通过一种新的溶胶-凝胶方法（“砖和砂浆”）、电化学沉积和3d介孔导电氧化铟锡（ITO）网络沉积来合成。所有获得的纳米结构将进行详细的光电化学表征，并利用激光闪光光解和停止流动技术研究载流子动力学。由于已知在波长小于赤铁矿带隙能量的光照射下会发生铁（II）的光溶解，这可能会改变光阳极的形态和光电化学特性，因此本文将分析其溶解沉淀机理，并阐述提高阳极长期稳定性的方法。