| 학회 |
한국재료학회 |
| 학술대회 |
2019년 봄 (05/15 ~ 05/17, 평창 알펜시아 리조트) |
| 권호 |
25권 1호 |
| 발표분야 |
특별심포지엄5. 인공광합성 기술-오거나이저:김동환(고려대)/이해석(고려대) |
| 제목 |
Enhancing long-term photostability of BiVO4 photoanodes for solar water splitting by tuning electrolyte composition |
| 초록 |
Solar hydrogen production is an attractive way to harvest solar energy into a storable enrgy 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) becaused of its early photocurrent onset potential and favorable valance band position for water oxidation. In this presentation, we will present a strategy to suppress photocorrosion of BiVO4 photoanodes during photoelectrochemical water oxidation. We found that anodic photocorrosion of BiVO4 photoanodes involves the loss of V5+ form the BiVO4 lattice by dissolution. We demonstrate that the use of a V5+-saturated electrolyte, which inhibits the photoxodiation-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 recnet strategies to improve photoelectrochemical performance of BiVO4 will be discussed. |
| 저자 |
이동기1, 최경신2
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| 소속 |
1한국과학기술(연), 2Univ. of Wisconsin-Madison |
| 키워드 |
Solar water spltting; Hydrogen evolution; Photoelectrochemistry; BiVO4; Photoanodes
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| E-Mail |
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