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|
| Type |
Symposium |
| Area |
Physical Chemistry Approaches in Energy and Environmental Materials |
| Room No. |
Room 401+402 |
| Time |
FRI 16:00-16:20 |
| Code |
PHYS3-5 |
| Subject |
Enhancing long-term photostability of BiVO4 photoanodes for solar water splitting by tuning electrolyte composition |
| Authors |
Dong Ki Lee*, Kyoung-Shin Choi1
Clena Energy Research Center, Korea Institute of Science and Technology, Korea
1Chemistry, University of Wisconsin-Madison, United States
|
| Abstract |
Solar hydrogen production is an attractive way to harvest solar energy into a storable energy carrier. However, the production cost of solar hydrogen is far from reality. One of viable option is constructing photoelectrochemical water splitting cell using chip materials, which can directly utilize solar-driven electrons into hydrogen evolution reaction. Among oxide-based photoelectrodes, n-type BiVO4 photoanodes have been widely coupled with chip photovoltaic materials (Si and CH3NH3PbI3) because of its early photocurrent onset potential and favorable valance band position for water oxidation. In this presentation, we will present an alternative strategy to suppress photocorrosion of BiVO4 photoanodes during photoelectrochemical water oxidation. We found that anodic photocorrosion of BiVO4 photoanodes involves the loss of V5+ from the BiVO4 lattice by dissolution. We demonstrate that the use of a V5+-saturated electrolyte, which inhibits the photooxidation-coupled dissolution of BiVO4, can serve as a simple yet effective method to enhance the photostability of BiVO4 during water oxidation for hundreds hours. The effect of the V5+ species in the electrolyte on photostability of BiVO4 and recent strategies to improve photoelectrochemical performances of BiVO4 will be discussed. |
| E-mail |
dnklee@kist.re.kr |
|
123rd General Meeting of the KCS