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Two-pronged approach towards simultaneous optimization of charge transfer and transport in metal oxide nanostructures for light energy conversion

机译:光能转换金属氧化物纳米结构同时优化电荷转移和运输的双管齐下的方法

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QD (QD)-sensitized and bandgap-modified metal oxide, e.g. TiO2, nanowires (NWs) have been studied as photoelectrode materials for photoelectrochemical (PEC) hydrogen generation]. In one system, CdSe-sensitized TiO2 nanowires were grown via electron beam codeposition and exhibited significantly enhanced incident photon to current conversion efficiency (IPCE) and photocurrent densities. In another system, the hydrothermal treatment of rutile-phase TiO2 arrays in an oxygen-deficient atmosphere generated TiO2 arrays with oxygen vacancies (V_o) situated within the bandgap These oxygen-deficient hematite arrays exhibited a photocurrent density of 1.97 mA/cm~2 at -0.6 V vs. RHE. The enhancement in photoactivity was due to the increased donor density from the V_o ites which thereby increased the visible light absorption characteristics of the material. Recent work has demonstrated a synergistic enhancement in the PEC performance when both modalities are combined.
机译:QD(QD) - 敏感和带隙改性金属氧化物,例如,已经研究了TiO2,纳米线(NWS)作为光电子化学(PEC)氢气产生的光电电极材料。在一个系统中,通过电子束沉积沉积生长Cdse敏化的TiO2纳米线,并表现出显着增强的入射光函为电流转换效率(IPCE)和光电流密度。在另一个系统中,缺氧气氛中的金红石相TiO2阵列的水热处理在带隙内的氧空位(V_O)产生的TiO2阵列这些缺氧赤粒型阵列显示为1.97mA / cm〜2的光电流密度-0.6 V与Rhe。光性的增强是由于来自V_O纸的供体密度增加,从而增加了材料的可见光吸收特性。最近的工作表明,当两种方式都结合时,PEC性能的协同增强。

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