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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Composition-Graded Zn_xCd_(1-x)Se@ZnO Core-Shell Nanowire Array Electrodes for Photoelectrochemical Hydrogen Generation
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Composition-Graded Zn_xCd_(1-x)Se@ZnO Core-Shell Nanowire Array Electrodes for Photoelectrochemical Hydrogen Generation

机译：用于光电化学产氢的成分分级Zn_xCd_（1-x）Se @ ZnO核壳纳米线阵列电极

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摘要

One-dimensional oxide nanostrncture arrays are widely investigated as photoelectrodes in solar cells or photoelectrochemical (PEC) solar hydrogen generation applications, for which it is highly desirable for the electrode to have a broad light absorption and an efficient chargeseparation. In this work, a composition-graded Zn_xCd_(1-x)Se@ZnOcore-shell nanowire array is prepared through temperature-gradient chemical vapor deposition (CVD) of Zn_xCd_(1-x)Se layer onto the pregrown ZnO nanowires. The core-shell nanowire array photoelectrodes yield a continuous absorption edge from 2.7 (460 nm) to 1.77 eV (700 nm)across the sample surface. The core-shell heterostructure facilitates the photogenerated electron-hole pair separation and the electron transfer from ZnCdSe to ZnO. By using such core-shell nanowire arrays as photoanodes for solar hydrogen generation via a PEC cell, a photocurrent density of ～5.6 mA/cm~2 is achieved under 1 son solar light illumination at zero bias versus Ag/ AgCl. This method may be useful in the design of multijunction nanostructured semiconductor photoelectrodes toward more efficient solar fuel devices.
机译：一维氧化物纳米结构阵列作为太阳能电池或光电化学（PEC）太阳能制氢应用中的光电极被广泛研究，为此，非常需要电极具有宽的光吸收和有效的电荷分离。在这项工作中，通过将Zn_xCd_（1-x）Se层的温度梯度化学气相沉积（CVD）到预生长的ZnO纳米线上，制备了成分分级的Zn_xCd_（1-x）Se @ ZnOcore-壳纳米线阵列。核-壳纳米线阵列光电电极在整个样品表面产生从2.7（460 nm）到1.77 eV（700 nm）的连续吸收边。核-壳异质结构促进了光生电子-空穴对的分离以及电子从ZnCdSe到ZnO的转移。通过使用这种核-壳纳米线阵列作为光阳极，通过PEC电池产生太阳能，在1子太阳光照射下，相对于Ag / AgCl，光电流密度达到〜5.6 mA / cm〜2。该方法在朝着更有效的太阳能燃料装置的多结纳米结构的半导体光电极的设计中可能是有用的。

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