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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Enhancing long-term photostability of BiVO4 photoanodes for solar water splitting by tuning electrolyte composition

등록일
2019년 1월 19일 18시 30분 44초
접수번호
2768
발표코드
PHYS3-5 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 16시 : 00분
발표형식
심포지엄
발표분야
Physical Chemistry - Physical Chemistry Approaches in Energy and Environmental Materials
저자 및
공동저자
Dong Ki Lee*, Kyoung-Shin Choi1
Clena Energy Research Center, Korea Institute of Science and Technology, Korea
1Chemistry, University of Wisconsin-Madison, United States
※ 국외소속으로 등록된 저자의 승인여부는 최소 3일이내 발표자 email로 알려드립니다.
승인 1건
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.

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