We have expertise in developing metal oxides as emerging materials for sustainable chemical conversion, e.g., solar water splitting. Various complex metal oxides, such as BiVO4, Fe2WO6, FeVO4, SnWO4, etc, have been examined and developed. We fabricate these complex oxides using scalable deposition techniques (e.g., spray pyrolysis, electrodeposition) and test their performance as (photo)electrodes and/or catalysts. We emphasize the determination of performance limiting factors and the correlation between defects and performance using various spectroscopy methods.
Our group is also interested in the design and demonstration of (photo)electrochemical devices. The devices mainly utilize the complex metal oxides we develop and employ a tandem configuration, in which two semiconductors with different band gaps are used to more efficiently absorb the sunlight. Solar-driven water splitting has been our focus reaction to generate green H2, but we also explore the introduction of alternative reactions, such as biomass oxidation and coupled hydrogenation, in order to increase the competitiveness of the overall device.
To support our research goals, we conduct various levels of modeling and simulations. Multiphysics modeling based on finite element analysis is commonly done to investigate and optimize device design and operational parameters, and the simulations are usually combined with validation experiments (e.g., fluorescence, shadowgraphy). Our research question focuses on identifying performance loss mechanisms related to device scale-up. Life cycle and technoeconomic assessments are also performed in order to evaluate the environmental and economic impact of our (photo)electrochemical devices.