| 학회 |
한국재료학회 |
| 학술대회 |
2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 |
23권 1호 |
| 발표분야 |
4. 광전기화학반응을 통한 태양에너지 변환(Photoelectrochemical Solar Energy Conversion) |
| 제목 |
Bifunctional NiFe Inverse Opal Electrocatalysts with Heterojunction Si Solar Cells for 9.54%-Efficient Unassisted Solar Water Splitting |
| 초록 |
Combination of photovoltaic (PV) cell and electrolyzer (EZ) has recently been considered a most practical and promising route to the commercialization of photoelectrochemical water splitting. The efficiency, stability, and cost of electrolyzers remain major challenges aside from the performance of photovoltaic cells. In this talk, we introduce a highly efficient, stable and low-cost bifunctional NiFe electrocatalyst and a PV-EZ combined water splitting system that uses NiFe inverse opal nanostructures for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) electrodes. Increased surface are from the 3-dimensional inverse opal structures reduces the overpotential by ~70 mV and ~90 mV for OER and HER, respectively. As expected from the decreased overpotential of individual reactions, an electrolyzer that consists of NiFe inverse opal structures with optimized number of thickness layers reduces the overpotential of water splitting by ~160 mV. When integrated to a mini module of four series-connected Si heterojunction solar cells with intrinsic thin layer, one of the state-of-art Si photovoltaic technologies, the NiFe inverse opal electrolyzer achieves a 9.54% solar-to-hydrogen conversion efficiency over 24 hours under a zero-bias condition. The combined photoelectrochemical water splitting investigated in this work is expected to provide a basis for the design of highly efficient renewable and sustainable water electrolysis systems that incorporate earth-abundant, low-cost materials. |
| 저자 |
Hakhyeon Song1, Seungtaeg Oh1, Hyun Yoon2, Ka-Hyun Kim2, Sangwoo Ryu1, Jihun Oh1
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| 소속 |
1Korea Advanced Institute of Science and Technology, 2Korea Institute of Energy Research |
| 키워드 |
water splitting; NiFe catalysts; inverse opal structures; photovoltaic-electrolyzer; solar-to-hydrogen efficiency
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| E-Mail |
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