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核壳WO3/BiVO4纳米纤维薄膜的制备与光电化学分解水研究

发表时间:2016-12-31  浏览量:1513  下载量:502
全部作者: 刘亚,刘旭,张骁,李明涛
作者单位: 西安交通大学动力工程多相流国家重点实验室
摘 要: 核壳WO3/BiVO4纳米纤维薄膜光电极由静电纺丝热分解系统在掺杂氟的二氧化锡(fluorine-doped tin oxide,FTO)导电玻璃上制备而成。该核壳结构光电极利用WO3/BiVO4界面处构成的二型交错带隙结构,达到了促进光生电荷分离的目的。同时WO3还可作为薄膜的立体支架起到传输光生电荷、增大反应表面积的作用。BiVO4则可以作为可见光吸收层,参与单侧产氧反应。相关光电化学分解水测试结果表明,该核壳结构光电极在工作电极电位为1.9 V[相对于可逆氢电极(reversible hydrogen electrode,RHE)]时,光电流密度可以达到1.75 mA/cm2. 而同样方法制备的单一材料光电极(WO3和BiVO4光电极)在相同工作电位下光电流密度仅为相应的0.08 mA/cm2和0.05 mA/cm2.
关 键 词: 太阳能;氢能;光电化学制氢;静电纺丝;WO3;BiVO4
Title: Fabrication and photoelectrochemical properties of the core-shell WO3/BiVO4 nanofiber film for water splitting
Author: LIU Ya, LIU Xu, ZHANG Xiao, LI Mingtao
Organization: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University
Abstract: A core-shell WO3/BiVO4 nanofiber film was fabricated on fluorine-doped tin oxide (FTO) coated substrates based on electrospinning pyrolysis. Type II staggered band gap structure was formed on the WO3/BiVO4 interface, and then accelerated the charge separation. In this photoelectrode, WO3 was served as the charge transport channel and framework, while BiVO4 was used as the visible light absorber and supplied the oxygen evolution reaction sites. The experiment results revealed that the photocurrent density of this core-shell nanofiber film could reach 1.75 mA/cm2 when the votage of the working electrode versus reversible hydrogen electrode (RHE) is 1.9 V. However, the pure WO3 and BiVO4 electrodes prepared by the same process only possess the photocurrent densities around 0.08 mA/cm2 and 0.05 mA/cm2, respectively.
Key words: solar energy; hydrogen energy; photoelectrochemical water splitting; electrospinning; WO3; BiVO4
发表期数: 2016年12月第24期
引用格式: 刘亚,刘旭,张骁,等. 核壳WO3/BiVO4纳米纤维薄膜的制备与光电化学分解水研究[J]. 中国科技论文在线精品论文,2016,9(24):2332-2537.
 
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