Surface Tuning for Promoted Charge Transfer in Hematite Nanorod Arrays as Water-Splitting Photoanodes
Surface Tuning for Promoted Charge Transfer in Hematite Nanorod Arrays as Water-Splitting Photoanodes
复制标题
表面调谐促进赤铁矿纳米棒阵列中的电荷转移作为水分解光电阳极
DOI：
10.1007/s12274-012-0213-6
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发表时间：
2012-05-01
期刊：
影响因子：
9.9
通讯作者：
Guo, Liejin
中科院分区：
文献类型：
--
作者：
Shen, Shaohua;Kronawitter, Coleman X.;Guo, Liejin
研究了W 6+掺杂对α-Fe 2 O3纳米棒薄膜表面形貌的影响，并将其作为光电化学电池的析氧光阳极。对未掺杂和W 6+掺杂的α-Fe 2 O3纳米棒薄膜进行了X射线衍射、场发射扫描电子显微镜、紫外-可见吸收光谱和光电化学（PEC）测量。发现W 6+掺杂主要影响α-Fe 2 O3纳米棒薄膜的光致发光特性。比较了未掺杂和W 6+掺杂的α-Fe 2 O3纳米棒薄膜、WO 3薄膜和α-Fe 2 O3修饰的WO 3复合电极。观察到掺杂剂浓度、光致发光强度和阳极光电流之间的密切相关性。结果表明，W 6+表面掺杂促进了α-Fe 2 O3纳米棒的电荷转移，从而提高了PEC的性能。这些结果表明，通过离子掺杂的表面调节应该代表进一步提高α-Fe 2 O3光阳极效率的可行策略。
Hematite (alpha-Fe2O3) nanorod films with their surface tuned by W6+ doping have been investigated as oxygen-evolving photoanodes in photoelectrochemical cells. X-ray diffraction, field emission scanning electron microscopy, UV-visible absorption spectroscopy, and photoelectrochemical (PEC) measurements have been performed on the undoped and W6+-doped alpha-Fe2O3 nanorod films. W6+ doping is found to primarily affect the photoluminescence properties of alpha-Fe2O3 nanorod films. Comparisons are drawn between undoped and W6+-doped alpha-Fe2O3 nanorod films, WO3 films, and alpha-Fe2O3-modified WO3 composite electrodes. A close correlation between dopant concentration, photoluminescence intensity, and anodic photocurrent was observed. It is suggested that W6+ surface doping promotes charge transfer in alpha-Fe2O3 nanorods, giving rise to the enhanced PEC performance. These results suggest surface tuning via ion doping should represent a viable strategy to further improve the efficiency of alpha-Fe2O3 photoanodes.