Shi Xinjian, Herraiz-Cardona Isaac, Bertoluzzi Luca, Lopez-Varo Pilar, Bisquert Juan, Park Jong Hyeok, Gimenez Sixto
Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.
Institute of Advanced Materials (INAM), Universitat Jaume I, 12071 Castelló, Spain.
Phys Chem Chem Phys. 2016 Apr 7;18(13):9255-61. doi: 10.1039/c5cp07905e.
WO3-BiVO4 n-n heterostructures have demonstrated remarkable performance in photoelectrochemical water splitting due to the synergistic effect between the individual components. Although the enhanced functional capabilities of this system have been widely reported, in-depth mechanistic studies explaining the carrier dynamics of this heterostructure are limited. The main goal is to provide rational design strategies for further optimization as well as to extend these strategies to different candidate systems for solar fuel production. In the present study, we perform systematic optoelectronic and photoelectrochemical characterization to understand the carrier dynamics of the system and develop a simple physical model to highlight the importance of the selective contacts to minimize bulk recombination in this heterostructure. Our results collectively indicate that while BiVO4 is responsible for the enhanced optical properties, WO3 controls the transport properties of the heterostructured WO3-BiVO4 system, leading to reduced bulk recombination.
由于各组分之间的协同效应，WO3 - BiVO4 n - n异质结构在光电化学水分解中表现出卓越的性能。尽管该系统增强的功能能力已被广泛报道，但解释这种异质结构载流子动力学的深入机理研究却很有限。主要目标是提供合理的设计策略以进一步优化，并将这些策略扩展到用于太阳能燃料生产的不同候选系统。在本研究中，我们进行了系统的光电和光电化学表征，以了解该系统的载流子动力学，并开发了一个简单的物理模型，以突出选择性接触对于最小化这种异质结构中的体相复合的重要性。我们的结果共同表明，虽然BiVO4负责增强光学性质，但WO3控制着异质结构的WO3 - BiVO4系统的传输性质，从而减少了体相复合。
