材料科学
纤锌矿晶体结构
分解水
纳米线
异质结
纳米技术
纳米结构
透射电子显微镜
氧化锡
光电子学
化学工程
兴奋剂
锌
光催化
冶金
工程类
催化作用
化学
生物化学
作者
Yu‐Kuei Hsu,Ying‐Chu Chen,Yan‐Gu Lin
标识
DOI:10.1021/acsami.5b03921
摘要
A facile and simple fabrication of Fe2O3 as a shell layer on the surface of ZnO nanowires (NW) as a core–shell nanoelectrode is applied for the photoelectrochemical (PEC) splitting of water. An ZnO NW array of core diameter ∼80 nm was grown on a fluorine-doped tin-oxide (FTO) substrate with a hydrothermal method; subsequent deposition and annealing achieved a shell structure of the Fe2O3 layer of thickness a few nm. Fe2O3 in the α phase and ZnO in the wurtzite phase were identified as the structures of the shell and core, respectively, through analysis with X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The ZnO/Fe2O3 core–shell NW showed an excellent PEC response to the oxidation of water, and also benefited from a negative shift of onset potential because of an n/n heterojunction structure. A detailed energy diagram of the ZnO/Fe2O3 core–shell NW was investigated with a Mott–Schottky analysis. This novel core–shell nanostructure can hence not only exhibit a great potential for the solar generation of hydrogen, but also offer a blueprint for the future design of photocatalysts.
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