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  • 09월 06일 11시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Nanoporous Si for H2 Production by Photoelectrochemical Water Splitting

2013년 9월 3일 13시 31분 55초
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목 11시 : 10분
환경에너지 - Solar Fuel Production: Challenge, Evolution, and Advancement Towards the Future
저자 및
한국과학기술원(KAIST) EEWS, Korea
Hydrogen production at a semiconductor/water interface by photoelectrochemical (PEC) reaction is a promising route to direct conversion of solar energy to a storable and clean fuel. For PEC H2 production on a semiconductor using only sunlight and water, materials must have energy bandgap > 1.23 eV, its conduction and valence band edge must straddle the water reduction and oxidation redox potentials, it must operate over long time without corrosion, and it must be earth-abundant. While various materials and systems have been tested for PEC H2 reaction, unfortunately, very few materials and systems meet those stringent requirements. Silicon is an earth-abundant and environmentally benign element and has a promising band edge position for H2 evolution reaction. Therefore, it can be used to build un-assisted water splitting system combining a metal oxide photoanode or external photovoltaic cells. However, Si suffers from high reflection (about 25 %) of incident solar photon that can not be used to produce H2. In addition, charge transfer rate at Si/water interface to produce H2 is sluggish. Here, we report that a nanoporous Si photocathode can significantly improve the H2 production rate by minimizing reflection and also enhance the sluggish charge transfer rate at the nanoporous layer. We also present various approaches to further improve the PEC H2 reaction by modifying a Si photocathode. We will also present recent results on stability of silicon photoelectrode in water during PEC reaction.