期刊
ACS ENERGY LETTERS
卷 2, 期 6, 页码 1362-1367出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00216
关键词
-
类别
资金
- Fondazione Cariplo through the project Novel Photocatalytic Materials Based on Heterojunctions for Solar Energy Conversion [2013-0615]
- Fondazione Cariplo [2013-1766]
- European Union Horizon Programme [696656]
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-FC02-04ER15.533]
- Fondazione Fratelli Confalonieri
Due to its similar to 2.4 eV band gap, BiVO4 is a very promising photoanode material for harvesting the blue portion of the solar light for photoelectrochemical (PEC) water splitting applications. In WO3/BiVO4 heterojunction films, the electrons photoexcited in BiVO4 are injected into WO3, overcoming the lower charge carriers' diffusion properties limiting the PEC performance of BiVO4 photo anodes. Here, we investigate by ultrafast transient absorption spectroscopy the charge carrier interactions occurring at the interface between the two oxides in heterojunction systems to directly unveil their wavelength dependence. Under selective BiVO4 excitation, a favorable electron transfer from photoexcited BiVO4 to WO3 occurs immediately after excitation and leads to an increase of the trapped holes' lifetime in BiVO4. However, a recombination channel opens when both oxides are simultaneously excited, evidenced by a shorter lifetime of trapped holes in BiVO4. PEC measurements reveal the implication of these wavelength dependent ultrafast interactions on the performances of the WO3/BiVO4 heterojunction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据