Sunlight-driven Monolithic Water Splitting Device Using the Anodized Ni-Fe Catalytic Substrate for Oxygen Evolution Reaction
- Title
- Sunlight-driven Monolithic Water Splitting Device Using the Anodized Ni-Fe Catalytic Substrate for Oxygen Evolution Reaction
- Authors
- 송영진
- Date Issued
- 2018
- Publisher
- 포항공과대학교
- Abstract
- Large-scale industrial application of solar-driven water splitting has called for the development of oxygen evolution reaction (OER) catalysts that deliver high catalytic ac-tivity and stability. Here we show that an efficient OER catalytic substrate can be devel-oped by roll-to-roll fabrication of electrodeposited Ni-Fe foils, followed by anodization. An amorphous oxyhydroxide layer directly formed on Ni-Fe foils exhibited high catalytic activity towards water oxidation in 1 M KOH solution, which required an overpotential of 0.251 V to reach current density of 10 mA/cm2. The developed catalytic electrode showed the best OER activity among catalysts with film structure. The catalyst also showed pro-longed stability at vigorous gas evolution condition for 36 h. To demonstrate the monolith-ic photo-assisted water splitting device, an amorphous silicon solar cell was fabricated on Ni-Fe catalytic substrate, resulting in lowering OER overpotential under light-illumination. This monolithic device is the first demonstration that the OER catalytic substrates and the solar cells are integrated, and can be easily applied for industrial scale solar-driven water electrolysis.
- URI
- http://postech.dcollection.net/common/orgView/200000008343
https://oasis.postech.ac.kr/handle/2014.oak/93108
- Article Type
- Thesis
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