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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Photoelectrochemical Nitrate Reduction to Ammonia on Ordered Silicon Nanowire Array Photocathodes

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Title
Photoelectrochemical Nitrate Reduction to Ammonia on Ordered Silicon Nanowire Array Photocathodes
Author
Kim, Hyo EunKim, JeehyeRa, Eun CheolZhang, HeminJang, Youn JeongLee, Jae Sung
Issue Date
2022-06
Publisher
WILEY-V C H VERLAG GMBH
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.61, no.25, pp.e202204117
Abstract
As a new path to "green" ammonia production, photoelectrochemical nitrate reduction reaction (PEC NO3RR) is investigated for the first time. An Au-decorated ordered silicon nanowire (O_SiNW) array photocathode demonstrates 95.6 % of Faradaic efficiency (FE) to ammonia at 0.2 V-RHE, which represents a more positive potential than the thermodynamic reduction potential of nitrate by utilizing photovoltage. The high FE is possible because both Si and Au surfaces are inactive for competing water reduction to hydrogen. The O_SiNW array structure is favorable to promote the PEC NO3RR relative to planar Si or randomly-grown Si nanowire, by enabling the uniform distribution of small Au nanoparticles as an electrocatalyst and facilitating the mass transport during the reaction. The results demonstrate the feasibility of PEC nitrate conversion to ammonia and would motivate further studies and developments.
URI
https://scholarworks.unist.ac.kr/handle/201301/58596
URL
https://onlinelibrary.wiley.com/doi/10.1002/anie.202204117
DOI
10.1002/anie.202204117
ISSN
1433-7851
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