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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics

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Hydrogen production based on a photoactivated nanowire-forest

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Title
Hydrogen production based on a photoactivated nanowire-forest
Author
Lee, SeyeongHanif, ZahidSeo, KeumyoungLim, TaekyungShin, Hye-MinPark, SungjunKim, Su HwanKwak, Sang KyuHong, SukwonYoon. Myung-HanJu, Sanghyun
Issue Date
2016-10
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.4, no.39, pp.14988 - 14995
Abstract
For several decades, the key challenge associated with thermochemical hydrogen generation has been the achievement of water splitting and catalyst regeneration at low temperatures while maintaining a reasonably high conversion efficiency over many cycles. Herein, we report low-temperature thermochemical hydrogen generation using hierarchically assembled iron oxide nanoarchitectures. Iron oxide nanoparticles conformally deposited onto a SnO2 nanowire forest allowed the splitting of water molecules and the production of hydrogen gas at temperatures of 400-800 degrees C, with a high specific gas-forming rate as high as similar to 25 000 mmol per g per cycle (250 min). More remarkably, deep-ultraviolet photoactivation enabled low-temperature (200 degrees C) catalyst regeneration and thereby multiple cycles of hydrogen production without any significant coalescence of the oxide nanoparticles nor substantial loss of the water-splitting efficiency. Hierarchically arranged iron oxide nanoarchitectures, in combination with photochemical catalyst regeneration, are promising for practical hydrogen generation by harvesting wasted thermal energy, even at temperatures below 500 degrees C.
URI
https://scholarworks.unist.ac.kr/handle/201301/20650
URL
http://pubs.rsc.org/en/Content/ArticleLanding/2016/TA/C6TA06172A#!divAbstract
DOI
10.1039/c6ta06172a
ISSN
2050-7488
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