材料科学
铁电性
异质结
纳米线
光电子学
光电流
极化
钛酸钡
极化(电化学)
分解水
纳米技术
电介质
化学
光催化
物理化学
催化作用
生物化学
作者
Weiguang Yang,Yanhao Yu,M. Starr,Xin Yin,Zhaodong Li,A. Kvit,Shifa Wang,Ping Zhao,Xudong Wang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2015-10-22
卷期号:15 (11): 7574-7580
被引量:288
标识
DOI:10.1021/acs.nanolett.5b03988
摘要
The performances of heterojunction-based electronic devices are extremely sensitive to the interfacial electronic band structure. Here we report a largely enhanced performance of photoelectrochemical (PEC) photoanodes by ferroelectric polarization-endowed band engineering on the basis of TiO2/BaTiO3 core/shell nanowires (NWs). Through a one-step hydrothermal process, a uniform, epitaxial, and spontaneously poled barium titanate (BTO) layer was created on single crystalline TiO2 NWs. Compared to pristine TiO2 NWs, the 5 nm BTO-coated TiO2 NWs achieved 67% photocurrent density enhancement. By numerically calculating the potential distribution across the TiO2/BTO/electrolyte heterojunction and systematically investigating the light absorption, charge injection and separation properties of TiO2 and TiO2/BTO NWs, the PEC performance gain was proved to be a result of the increased charge separation efficiency induced by the ferroelectric polarization of the BTO shell. The ferroelectric polarization could be switched by external electric field poling and yielded PEC performance gain or loss based on the direction of the polarization. This study evidence that the piezotronic effect (ferroelectric or piezoelectric potential-induced band structure engineering) holds great promises in improving the performance of PEC photoelectrodes in addition to chemistry and structure optimization.
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