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Synthesis and characterization of transition metal oxide nanotubes for photoelectrochemical hydrogen generation.

机译：用于光电化学制氢的过渡金属氧化物纳米管的合成与表征。

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摘要

Two different configurations of photo anodes based on anodic iron oxide were investigated for photo electrochemical water oxidation. Self ordered and vertically oriented array of iron oxide nanotubes was obtained by anodization of pure iron substrate in ethylene glycol based electrolyte containing 0.1 M NH4F + 3 vol% water (EGWF solution) at 50 V for 15 minutes. Annealing of the oxide nanotubes in hydrogen environment at 500 °C for 1 h resulted in predominantly hematite phase. The second type of photo anode was obtained by a two-step anodization procedure. This process resulted in a two- layered oxide structure, a top layer of nano-dendrite morphology and a bottom layer of nanoporous morphology. This electrode configuration combined the better photo catalytic properties of the nano-dendritic iron oxide and better electron transportation behavior of vertically oriented nano-channels. Annealing of these double anodized samples in acetylene environment at 550 °C for 10 minutes resulted in a mixture of maghemite and hematite phases. Photo current densities of 0.74 mA/cm2 at 0.2 VAg/AgCl and 1.8 mA/cm 2 at 0.5 VAg/AgCl were obtained under AM 1.5 illumination in 1 M KOH solution. The double anodized samples showed high photo conductivity and more negative flat band potential (-0.8 VAg/AgCl), which are the properties required for promising photo anode materials. Apart from the above work, mild steel which is 10 times less the cost of Ti is also being tested for its photoelectrochemical properties. TiO2 nanotubes synthesized and annealed in different conditions are compared for their quantum efficiency is also carried out in this work. Quantum efficiency measurements gives more reliable and photocurrent data towards photoelectrochemical applications.
机译：研究了基于阳极氧化铁的两种不同结构的光阳极，用于光电化学水氧化。通过将纯铁基质在含有0.1 M NH4F + 3体积％水（EGWF溶液）的乙二醇基电解质中于50 V阳极氧化15分钟，获得氧化铁纳米管的有序垂直取向阵列。氧化碳纳米管在氢气环境中于500°C退火1 h，主要形成赤铁矿相。通过两步阳极氧化过程获得第二种类型的光阳极。该过程导致两层氧化物结构，纳米树突形态的顶层和纳米孔形态的底层。这种电极配置结合了纳米树枝状氧化铁的更好的光催化性能和垂直取向的纳米通道的更好的电子传输性能。将这些双重阳极氧化的样品在乙炔环境中于550°C退火10分钟，得到磁赤铁矿和赤铁矿相的混合物。在1 M KOH溶液中在AM 1.5照明下，在0.2 VAg / AgCl下的光电流密度为0.74 mA / cm2，在0.5 VAg / AgCl下的光电流密度为1.8 mA / cm 2。双重阳极氧化样品显示出高的光电导率和更多的负平坦带电势（-0.8 VAg / AgCl），这是有前途的光阳极材料所需的特性。除上述工作外，还对钛成本低10倍的低碳钢的光电化学性能进行了测试。比较了在不同条件下合成和退火的TiO2纳米管的量子效率。量子效率测量为光电化学应用提供了更可靠的光电流数据。

著录项

  • 作者

    Rangaraju, Raghu Raj.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Alternative Energy.;Engineering Materials Science.;Engineering Metallurgy.;Nanoscience.
  • 学位 M.S.
  • 年度 2009
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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